For decades, aluminum oxide has been a material of intrigue and considerable promise within the scientific community, especially in the realm of catalysis and surface chemistry. The prevailing theoretical frameworks had long posited that the basal plane of aluminum oxide, particularly the α-Al2O3(0001) surface, would reveal a smooth, well-ordered array of aluminum atoms. This conjecture implied a highly reactive surface, ideally suited for catalyzing critical chemical reactions such as water splitting, a process central to hydrogen production and energy technologies. Yet, in a perplexing contradiction, experimental observations consistently demonstrated a significantly lower chemical reactivity than these models predicted.

In an illuminating advancement spearheaded by researchers at the Vienna University of Technology (TU Wien), this paradox has been methodically interrogated using pioneering techniques that transcend the limitations of conventional surface analysis. By integrating noncontact atomic force microscopy (AFM)—a cutting-edge technique that captures images of surfaces with atomic precision—with density functional theory calculations, the research team has revealed a reality at the atomic scale that could fundamentally reshape our understanding of aluminum oxide’s surface chemistry.

Contrary to what classical models suggested, the TU Wien team discovered that the α-Al2O3(0001) surface is far from a uniform and ordered plane. Instead, it appears as a remarkably irregular and rugged landscape when viewed on the atomic scale. This surface is incomplete in its ordered aluminum atom arrangement, revealing that the pristine and smooth configurations exist only in tiny localized patches. Beyond these nano-sized domains, the surface abruptly transitions into disordered regions, featuring substantial atomic-scale height variations, spanning several atomic layers, and thus significantly differing in structure and reactivity.

This structural irregularity has a profound implication for the chemical behavior of the surface. The presence of atomic-scale roughness disrupts the anticipated uniform catalytic activity, offering a compelling explanation for the historically observed discrepancy between theory and experiment. Indeed, where the small patches of ordered aluminum atoms predict reactivity consistent with traditional catalytic models, the majority rough and inhomogeneous surface areas lack such activity.

This breakthrough hints at a critical reevaluation of how scientists interpret and predict surface chemical processes, particularly at the nanoscale. It illustrates that theoretical calculations relying on assumptions of ideal, smooth surfaces could bear limited accuracy when applied to real-world materials. Instead, the true atomic topography—including disorder and defects—must be rigorously accounted for to achieve meaningful predictions of surface reactivity and catalysis.

The ramifications of this insight into the surface nature of α-Al2O3(0001) extend considerably beyond aluminum oxide itself. Given that numerous technologically relevant materials—ranging from catalysts used for environmental remediation to substrates involved in thin-film growth—exhibit similarly complex atomic-scale surface structures, this research necessitates a broad reconsideration of surface chemistry principles. Materials scientists and engineers must now recognize that chemical composition alone cannot fully describe surface behavior; rather, atomic-scale architecture plays an equally vital and dynamic role.

The investigative journey pursued by the TU Wien group relied heavily on noncontact atomic force microscopy, a sophisticated analytical technique that allows researchers to “see” the positions of individual atoms without perturbing the delicate surface chemistry. This technique, combined with robust computational methods grounded in density functional theory, enabled the researchers to correlate the observed atomic-scale irregularities with distinct modifications in surface chemical potential and activity. It is this interplay of experimental precision and theoretical rigor that exposed the complexity of the α-Al2O3(0001) surface.

Practically, this discovery challenges researchers to rethink the design and application of aluminum oxide surfaces in catalytic converters, hydrogen generation, and sensor technologies. Tailoring surface properties might no longer be achieved by simply controlling chemical stoichiometry or macroscopic morphology; instead, atomic-level engineering and control of surface reconstruction and disorder will become indispensable. Such efforts could pave the way for optimized materials that capitalize not only on their chemical identity but also on their spatial atomic configurations.

Moreover, this work opens exciting new pathways for future research in the field of surface science. The recognition that surfaces previously assumed smooth are instead atomically rugged suggests a new landscape of potential reaction sites whose properties can be selectively harnessed. Understanding and manipulating these irregularities could unlock unprecedented control over surface reactions, including those fundamental to energy sustainability, environmental catalysis, and the fabrication of nanoscale devices.

This study also underscores the indispensable role of high-resolution imaging technologies in material science. By revealing surface realities invisible to traditional characterization methods, AFM imaging coupled with theoretical calculations provides a more comprehensive and truthful representation of material surfaces. Such an approach not only resolves long-standing scientific mysteries but also equips researchers with tools necessary for pioneering advances across multiple scientific and industrial sectors.

In conclusion, the revelation that the α-Al2O3(0001) surface is inhomogeneous and rough fundamentally alters long-standing assumptions in catalysis research and materials science. The discovery that atomic-scale geometric disorder governs chemical properties redefines how surfaces are understood and utilized. This knowledge recalibrates existing theoretical models and necessitates an integrative approach, combining precise experimental measurements with advanced simulations to predict and exploit surface chemistry accurately.

The insight gained through TU Wien’s research dramatically enhances our understanding of aluminum oxide and similar materials, where surface structure intricacies dictate functionality. As technologies increasingly move towards the nanoscale, appreciating and engineering atomic-scale surface variations will be crucial. This advancement embodies a significant leap forward in characterizing and applying surfaces for the next generation of catalytic and electronic materials.

Subject of Research: Not applicable
Article Title: AFM imaging reveals the unreconstructed α‑Al2O3(0001) surface to be inhomogeneous and rough
News Publication Date: 27-May-2026
Web References: DOI: 10.1038/s41467-026-73690-0
Image Credits: TU Wien

Keywords
Atomic force microscopy, Aluminum oxide, Surface roughness, Catalysis, Density functional theory, Surface chemistry, Atomic-scale disorder, Water splitting, Surface reactivity, Nanomaterials, Material science, Surface physics

In a groundbreaking development poised to revolutionize energy storage technologies, researchers Park, D., Kim, H., and Kim, Y. have unveiled a novel class of flexible lithium supercapacitors featuring water-processable solid-state electrolytes. Published in the upcoming 2026 issue of npj Flexible Electronics, this study introduces an innovative electrolyte system rooted in aromatic acid-doped branched poly(ethylene imine) platforms, promising significant advancements in safety, flexibility, and device performance. This pioneering work addresses longstanding challenges plaguing conventional lithium-ion battery and supercapacitor technologies, particularly in the realm of wearable and flexible electronics.

The surge in demand for flexible energy storage solutions stems from the rapid proliferation of wearable devices, soft robotics, and flexible displays. However, traditional lithium-ion batteries, with their liquid electrolytes, pose severe safety hazards, including leakage and flammability, and suffer from mechanical rigidity, limiting their integration in flexible platforms. Solid-state electrolytes (SSEs) have emerged as a promising alternative due to their inherent safety and stability advantages, but they often encounter issues related to ionic conductivity and processability that impede their commercial adoption.

Against this backdrop, the research team drew inspiration from polymer chemistry and green processing techniques to engineer a new electrolyte matrix capable of marrying mechanical flexibility with outstanding electrochemical performance. Their approach leveraged the unique molecular architecture of branched poly(ethylene imine) (bPEI), a polymer known for its high density of amine groups, and strategically doped it with aromatic acids to enhance ionic transport pathways. This synergy not only optimizes lithium-ion mobility but also facilitates electrolyte fabrication through environmentally friendly water-based processing methods.

The doping of bPEI with aromatic acids imparts several critical functionalities. Aromatic acids bestow rigidity and electronic delocalization within the polymer matrix, which supports the formation of stable ion-conducting networks. This doping fundamentally alters the polymer’s microstructure, tailoring its free volume and facilitating the transport of lithium ions across the electrolyte. The resultant material exhibits a remarkable balance between mechanical robustness—allowing for bending and twisting—and ionic conductivity, which rivals that of traditional liquid electrolytes.

Water processability represents a significant leap forward in sustainable manufacturing of flexible energy devices. Conventional polymer electrolytes often require toxic organic solvents or complicated synthesis protocols, limiting scalability and environmental compatibility. The ability to process the new electrolyte in aqueous media simplifies fabrication, reduces costs, and enhances the potential for large-scale roll-to-roll manufacturing of flexible supercapacitors and batteries. This eco-friendly aspect aligns with global sustainability goals and strengthens the commercial viability of next-generation energy storage systems.

Electrochemical characterization of the newly developed supercapacitors revealed impressive performance metrics. The devices demonstrate high specific capacitance and excellent rate capability, maintaining stable charge-discharge cycles over extended periods. Crucially, the solid-state nature of the electrolyte effectively suppresses dendritic lithium growth, a major challenge that causes short circuits and catastrophic failure in lithium-metal batteries. This safety enhancement is particularly crucial for flexible applications where mechanical deformation could exacerbate dendrite formation.

Moreover, the mechanical testing underscored the electrolyte’s resilience under dynamic deformation. The supercapacitors sustain stable electrochemical performance even after multiple bending tests, mimicking real-world application conditions such as wearable textiles and foldable devices. The polymer matrix’s branched architecture absorbs mechanical stress, preventing microcracks and delamination that typically deteriorate device longevity. This robustness opens pathways to integrate lithium supercapacitors into versatile form factors previously inaccessible to rigid battery chemistries.

The theoretical underpinning for the enhanced ionic conductivity was explored through molecular dynamics simulations and spectroscopic analysis. These studies revealed that the aromatic acid dopants serve as both lithium-ion coordination centers and physical crosslinks within the bPEI network, creating continuous lithium-ion conduction pathways. This contrasts with typical polymer electrolytes where ionic clusters form isolated domains that impede charge transport. The design principle showcased here demonstrates how chemical tailoring at the molecular level can profoundly influence macroscopic device properties.

The researchers also explored the electrolyte’s thermal stability, a critical parameter for real-world deployment. Thermal gravimetric analysis and differential scanning calorimetry confirmed that these materials remain stable across a wide temperature range, preventing degradation under harsh operating conditions. This attribute is essential not only for flexible electronics subjected to varying ambient conditions but also for high-power applications where heat generation can impair battery life or pose safety risks.

Integration of the solid-state electrolyte within flexible device architectures leveraged straightforward fabrication techniques, including solution casting and layer-by-layer assembly. The compatibility with standard lithographic and printing methods underscores its adaptability to diverse manufacturing environments. The seamless assembly of the supercapacitor components ensures uniform electrolyte distribution, intimate electrode-electrolyte contact, and minimal interfacial resistance, which are paramount for optimal device efficiency.

The implications of this research extend beyond flexible energy storage. The design concept of aromatic acid-doped branched polyamines could be expanded to develop other functional polymer systems for energy conversion, including solid polymer electrolytes for fuel cells or electrochromic devices. The water-processable and environmentally benign processing methodology further positions this platform as a versatile candidate for green electronics manufacturing.

Looking forward, the study lays a robust foundation for incorporating additional functional dopants to tailor electrolyte properties for specific applications—such as enhanced ionic selectivity, improved mechanical strength, or self-healing capabilities. Coupling these materials with emerging electrode chemistries, including lithium metal or silicon-based anodes, may unlock unprecedented energy densities for flexible supercapacitors, tackling limitations inherent in current lithium-ion technology.

As wearable and flexible electronics become pervasive, the need for energy storage systems that are not only high-performing but also safe, scalable, and environmentally friendly grows exponentially. The work by Park and colleagues represents a major milestone in achieving this balance, demonstrating an elegant interplay of molecular design, green chemistry, and device engineering. Their innovative solid-state electrolyte platform heralds a new era in flexible lithium supercapacitors that could transform consumer electronics, healthcare devices, and beyond.

The prominence of this new electrolyte system is expected to catalyze further research efforts aimed at bridging the gap between laboratory prototypes and market-ready products. Industry stakeholders are particularly interested in its compatibility with existing manufacturing infrastructure and its potential to circumvent safety concerns associated with liquid electrolytes. This advancement is well aligned with the increasing regulatory emphasis on safe and sustainable battery technologies worldwide.

In conclusion, the introduction of aromatic acid-doped branched poly(ethylene imine) to create water-processable solid-state electrolytes marks a significant step toward flexible, safe, and durable lithium supercapacitors. The exemplary performance, coupled with environmentally conscious processing approaches, positions these materials at the forefront of next-generation energy storage innovation. As the digital age embraces flexibility and mobility, such breakthroughs are indispensable in powering our increasingly connected world.

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Subject of Research: Development of flexible lithium supercapacitors leveraging water-processable solid-state electrolytes based on aromatic acid-doped branched poly(ethylene imine) platforms.

Article Title: Flexible Lithium Supercapacitors with Water-Processable Solid-State Electrolytes Based on Aromatic Acid-Doped Branched-Poly(ethylene imine) Platforms.

Article References:
Park, D., Kim, H. & Kim, Y. Flexible Lithium Supercapacitors with Water-Processable Solid-State Electrolytes Based on Aromatic Acid-Doped Branched-Poly(ethylene imine) Platforms. npj Flex Electron (2026). https://doi.org/10.1038/s41528-026-00600-1

Image Credits: AI Generated

A nanoscale fabric coating repels stains and microbes using only tap water.

Confine a liquid to a region a millimetre or less in size, and you’re in the weird world of “microfluidics” – where surface tension and capillary action dominate in ways we easily overlook from our macro-scale vantage point. Despite being a term that was coined only in 1992, the underlying phenomena have been with us for millennia, as Albert Folch argues in How the World Flows: Microfluidics From Raindrops to COVID Tests.

Folch, who is a professor of bioengineering at the University of Washington in the US, has spent his career developing microfluidic devices that exploit the peculiar properties of flows at this scale. In this book, he now steps back to admire the full scope and impact of microfluidics, revelling in droplets that form rainbows, deliver inhalable asthma medications, make up salad dressings and cosmetics, and print scaffolds of living tissue to aid patients’ healing.

I particularly enjoyed Folch’s ode to the Olmec – Indigenous people who lived in Central America from about 1200 BCE to 400 BCE. They would harvest latex from Panama rubber trees by tapping the bark and collecting the liquid drop by drop before the day’s heat caused the latex to coagulate and seal the cut. The Olmec even had their own version of vulcanization – the process that makes rubber elastic – using the juice of morning glory vines to process the sap into bouncy elastic balls, stretchy bands, shoe soles and raingear.

The Olmec spread their knowledge to neighbours as well. In fact, the name “Olmec” comes from the Aztec language and literally means “the rubber people”. Like the maple sugar industry – which gets its own historical treatment from Folch – the Olmecs’ latex harvest relied on a tree’s vascular system, made up of narrow 25 µm capillaries that carry liquids like water, sap, resin and latex to nourish and defend the tree. Although the Olmec civilization eventually declined, their technology and ingenuity lived on, impacting the entire world.

Folch walks readers not just through the physics and biology of these systems – capillary rise, photosynthesis, transpiration – but through their human impact, too. He includes wonders, such as natural rubber powering a Victorian-era craze that brought us tyres, inflatable boats, children’s dummies (pacifiers) and other objects. Folch also covers darker stuff, such as the British businessman Henry Wickham (1846–1928) who smuggled thousands of rubber tree seeds out of the Brazilian Amazon to establish plantations in Africa and Asia, where he could exploit cheaper labourers.

Another chapter begins in the mountains near Granada, Spain, where villagers are rebuilding acequias – open-air waterways originally built by the Moors in medieval times. For nearly 1000 years, acequias turned the arid slopes into terraced fruit gardens by diverting snowmelt toward agriculture and recharging the groundwater. Water seeps downward through the acequia’s dirt bottom, protecting it from evaporating in the hot Sun and feeding aquifers.

As Folch notes, aquifers contain nearly 30% of Earth’s freshwater – far more than is found in rivers and lakes, which make up less than 1% of the total. But in the US alone, industrial agriculture has been draining aquifers at rates as high as 60 cm per year, far exceeding the slow percolation of rainfall into these underground reservoirs.

In fact, aquifers take hundreds or thousands of years to recharge, which, Folch notes, means a depleted aquifer effectively ceases to exist for those of us living now. Without acequias and other dedicated efforts to replenish aquifer levels through microfluidic flow, today’s corn fields will soon turn to dust.

Candles to kidneys

How the World Flows charts the history of other unexpectedly microfluidic technologies too. Candles, for example, carry their fuel to the flame by capillary action along the wick. Then there’s paper, which soaks up ink through capillary action. Among more recent microfluidic inventions, Folch offers special laurels to the ballpoint pen, of which BIC alone has sold over 100 billion units since 1950.

Folch also takes care to introduce readers to many microfluidic medical devices, which might not be as widespread as ballpoint pens, but are perhaps more important. They range from dialysis machines that clean blood for failing kidneys, to COVID tests and continuous glucose monitors that let diabetics manage their blood glucose levels – a microfluidic technology that’s critical in my own home.

Folch describes the microfluidic devices that enable the Human Genome Project, as well as prototype instruments that could one day catch cancer cells through a simple blood screening. He also covers devices that could pick the perfect personalized drug cocktail for treating a patient’s tumour by studying their biopsied cells.

The most stunning microfluidic device Folch describes may be us.

But the most stunning microfluidic device Folch describes may be us. As he argues, we ourselves are microfluidic. From our lungs to our cardiovascular system, from our lymphatic system to our sweat glands, our bodies rely on flow through tiny vessels.

Our bodies make up for diffusion’s slow pace by operating in parallel. Like the many co-operating central-processing units in a supercomputer, our bodies absorb oxygen through 500 million micro-sized alveoli in our lungs. We hear through ears equipped by microfluidics to act as both microphones and accelerometers. Our kidneys clean some 200 litres of blood a day – sending two litres of urine to our bladders as they do – through massively parallelized filtration.

Throughout How the World Flows, Folch’s enthusiasm for his subject shines. His approach is that of a storyteller, rather than a scientist, and the book is all the better for it. Whether readers are microfluidics experts or not, they will walk away with new stories to tell. (Don’t skip the footnotes…)

Although Folch’s stories are wide-ranging and entertaining, he stumbles at times with the overarching narrative. Some transitions are rough, and it’s not always clear why he’s chosen to order the stories in the way they’re presented. Nevertheless, his book is a fun and highly readable introduction to microfluidics that’s sure to entertain lay readers and excite a new generation of microfluidic engineers.

• 2025 Oxford University Press 306pp £22.31hb £19.16ebook

The post The wonderful world of microfluidics appeared first on Physics World.

In an innovative leap for sustainable architecture, researchers at Chalmers University of Technology in Sweden have engineered a groundbreaking, entirely bio-based material derived from an unconventional source: yeast. This novel material possesses the unique capability to be 3D printed and customized, opening new avenues for ecological design in construction and interior applications. Traditionally, many architectural elements such as plaster, plastics, and synthetic textiles have been heavily reliant on fossil-based resources, which contribute substantially to environmental degradation. The Chalmers team’s yeast-based hydrogel challenges this paradigm by offering a renewable alternative tailored for elements like daylight modulating screens, room partitions, and other interior architectural components.

The construction industry is notoriously resource-intensive and a significant contributor to global greenhouse gas emissions. This demands urgent development of renewable and resource-efficient materials that reduce both the carbon footprint and waste generated in building processes. In response to this challenge, the Chalmers research group investigated the use of industrial residues and natural polymers to create material systems that promote circularity within architecture. Their resulting composite blends baker’s yeast, cellulose fibers extracted from wood, alginate obtained from brown seaweed, glycerol sourced from plants, and water into a cohesive hydrogel matrix suitable for additive manufacturing technologies.

The material is fundamentally a soft, jelly-like substance that maintains malleability and can undergo precise shaping via pressure-based 3D printing at ambient temperature. Unlike conventional manufacturing processes requiring high temperatures or supports, this innovative method allows for energy-saving fabrication and complex geometries without material waste. The researchers have likened the initial phase of preparation to a baker’s process in reverse: the yeast is first heat-deactivated to stabilize it, then blended with other constituents to form a smooth print-ready hydrogel. This technique enables unparalleled design freedom and control over key properties such as texture, shape, and material distribution.

One of the remarkable aspects of this yeast-based system is its tunability. Small modifications in formulation can vary transparency, color, and surface finish, making the material highly adaptable for specific interior environments. The natural hues span from gentle yellows to rich browns, which can be further diversified through the addition of natural pigments or genetically pigmented yeast strains. This versatility promises broad usability, ranging from sunlight-filtering architectural screens to customizable wall panels and partitions. Such attributes position the yeast hydrogel as a potent green substitute for plastics and synthetic textiles in the built environment.

The choice of yeast as a primary biomass component is particularly visionary. Yeast cells proliferate rapidly under non-stringent conditions and are less susceptible to contamination, making production scalable and consistent. Rather than using yeast for its conventional role in fermentation, the research capitalizes on its role as a structural and volumetric agent within the composite. By deactivating the yeast before printing, the material attains physical robustness essential for architectural applications. Additionally, the team highlights the prospect of utilizing by-products from brewing and agricultural industries, which currently often become waste, to strengthen sustainable material cycles.

This research redefines sustainability by embracing the finite lifespan of materials within built systems. Contrary to traditional materials engineered primarily for long-term durability, the yeast-based hydrogel embraces biodegradability and cyclic use. This conceptual shift allows architects and designers to contemplate materials not only in terms of longevity but also their capacity for natural degradation, integrating the aging process as a conscious design element. Such a philosophy aligns closely with principles of circular economy and ecological stewardship.

The fabrication technology employed—3D printing—plays a critical role in actualizing zero-waste production. The additive process enables creation of highly intricate forms at room temperature without generating offcuts or requiring support scaffolds, significantly reducing raw material consumption. Finer control over structural parameters also suggests potential for optimizing thermal properties, light transmission, and mechanical performance. This integration of biomaterials with digital manufacturing marks a significant milestone towards truly sustainable and bespoke architectural solutions.

Despite its promise, the research team acknowledges that additional investigations are necessary before commercial-scale deployment. Future work will explore critical performance metrics including mechanical strength, fire resistance, moisture behavior, and scaling manufacturing techniques. The aspiration is to engineer the yeast composite into a fully certified building material that can withstand practical environmental demands while maintaining its ecological benefits. Addressing these challenges will be pivotal for broader acceptance and utilization of bio-based architectural materials.

Looking forward, the researchers envision a future where Engineered Living Materials (ELMs) transcend current capabilities by incorporating multifunctional properties such as self-healing or air-purifying functions. Such advancements could transform how buildings interact dynamically with their environment, enhancing indoor air quality and reducing maintenance through active material responses. The current yeast-based hydrogel thus represents not just a material innovation but a foundational step towards smart, sustainable architecture.

The multidisciplinary approach behind this innovation combines expertise in biomaterials, architecture, and manufacturing science. The synergy between biology-inspired components and digital fabrication technologies opens new dimensions for creativity and ecological responsibility in design. As awareness about material impact grows globally, solutions like the Chalmers yeast hydrogel position bio-based composites as strategic alternatives within future circular building economies.

This pioneering work underscores an emerging paradigm in which sustainability, functionality, and aesthetics coalesce. It challenges the material conventions of architecture by demonstrating novel pathways to reduce reliance on fossil and synthetic inputs while enhancing design versatility and material lifecycle thinking. As the built environment moves towards more resilient and adaptive frameworks, bio-innovations like those from Chalmers University signal a vibrant direction for future material science in architecture.

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Subject of Research: Development of a novel 3D-printable yeast-based architectural material

Article Title: Novel 3D printable yeast-based materials for architectural applications

Web References:
https://doi.org/10.1016/j.foar.2026.01.003

Image Credits: Chalmers University of Technology | Henrik Sandsjö

Keywords

Sustainable Architecture, Bio-based Materials, 3D Printing, Yeast Hydrogel, Circular Design, Engineered Living Materials, Renewable Construction Materials, Biomaterials, Digital Manufacturing, Interior Design, Biodegradability, Environmental Innovation

Quantum entanglement is a state in which particles are entwined with each other. In this entwined state, the

At the 1912 Summer Olympics in Stockholm, winners of individual events received medals that were exactly what their name promised. Each was struck in solid gold. They were the last of their kind. 

So what is an Olympic gold medal actually made of, and why did the real thing disappear after a single Games in 1912?

What a modern gold medal is actually made of

The short answer is silver. Under the rules of the International Olympic Committee, a “gold” medal must be at least 92.5 percent silver, the same purity standard used for sterling silver. 

In everyday terms, a recent gold medal carries roughly 500 grams of silver under those six grams of gold. The gold you can see accounts for a little over one percent of the medal’s weight. The thing draped around a champion’s neck is, by mass, a silver disc that has been gilded.

Why the solid version vanished

As you might have guessed, the change came down to cost and scale. Gold is expensive, the Games keep growing, and minting hundreds of solid-gold medals every few years stopped being practical. The 1912 Games offer the clearest illustration of how small the original supply was: just 90 solid gold medals were struck, reserved for winners of individual events.

That arrangement already hints at the compromise. Even in 1912, organisers limited the solid metal to a narrow group. Medals presented to members of winning teams were made of solid silver plated in gold. Team winners were already getting gold-plated silver.

After Stockholm, that became the rule for everyone.

What the 1912 winners actually held

The Stockholm medals were not large. An individual-event gold medal from those Games was only about 26 grams and 36mm in diameter. Compact, dense, and genuinely valuable as metal, they were closer in spirit to a coin than to the broad discs handed out today.

The scarcity has held its value over time. A 1912 Stockholm solid gold medal sold at auction for $35,851 in January 2023. The price reflects what the medal represents rather than the metal alone, but the metal is, at least, real gold all the way through.

Melt value versus what it fetches

For a modern medal, the materials are worth far less than the moment suggests. At recent precious-metal prices, the melt value of an Olympic gold medal sits at around $2,500. The Tokyo gold medals awarded in 2021 were worth roughly $800 in metal at the prices of the day.

The ceiling is another matter. Bobby Eaton, an Olympics memorabilia expert at RR Auction, has handled some of those sales. Greg Louganis’s 1984 springboard diving gold sold for just under $200,000, a figure that shows how far collectible value can run past metal value.

Of course, most athletes never test those numbers, because the value to them is not in the metal at all.

The post Just six grams of gold coat an Olympic “gold” medal, which is otherwise mostly silver — the last solid-gold medals were handed out at the 1912 Stockholm Games appeared first on Space Daily.

In a groundbreaking advancement for the field of organic electronics, researchers have unveiled a novel approach to creating deep-blue organic light-emitting diodes (OLEDs) that are not only highly efficient but also exhibit exceptional stability over prolonged use. This breakthrough hinges on optimizing the charge transfer dynamics within iridium-based phosphorescent materials, a feat that has eluded scientists for years due to the inherent challenges of balancing luminous efficiency with device longevity. The latest study, published on June 2, 2026, showcases how fine-tuning the molecular design and electronic interactions in these materials can revolutionize display technologies and solid-state lighting.

Organic light-emitting diodes are the backbone of modern display and lighting devices due to their lightweight, flexibility, and potential for low-cost manufacturing. However, blue OLEDs, particularly deep-blue variants, have long remained a bottleneck in the industry. Their performance typically pales in comparison to red and green counterparts, primarily because of difficulties in achieving high external quantum efficiency (EQE) while maintaining operational stability. The degradation mechanisms in blue OLEDs are often exacerbated by the high energy excitons required to produce blue light, resulting in rapid device failure. By addressing these persistent issues through enhanced charge transfer dynamics, the newly proposed iridium phosphorescent OLEDs mark a significant leap forward.

The core innovation lies in manipulating the photophysical properties of iridium complexes, which serve as the emissive centers in these OLED devices. Iridium is favored for its strong spin-orbit coupling, enabling efficient harvesting of triplet excitons and thereby boosting internal quantum efficiency. Yet, the challenge has been to mitigate efficiency roll-off at high luminance and to prolong device lifespan, especially for deep-blue hues where molecular stability is less assured. The interdisciplinary research team meticulously engineered ligands surrounding the iridium ion to facilitate precise electronic communication and improved charge transfer kinetics, which enhances both exciton utilization and thermal robustness.

A crucial aspect of the enhanced performance is the modulation of the charge transfer state between the iridium complex and its ligands. By optimizing this interaction, the researchers achieved balanced charge injection and transport within the OLED stack, thereby minimizing charge recombination losses. This optimization significantly reduces operational voltage, enhances brightness, and curbs the formation of non-radiative decay pathways that typically plague deep-blue emitters. The fine-tuned charge transfer dynamics ensure that excitons are efficiently channeled toward radiative recombination, culminating in record-breaking external quantum efficiencies surpassing previous benchmarks for deep-blue OLEDs.

Moreover, the study delves into the stability metrics under extended operational conditions, employing rigorous lifetime testing that simulates real-world device usage. The newly developed iridium-based OLEDs maintained over 90% of their initial luminance after 10,000 hours of continuous operation at high brightness levels—a figure that substantially outperforms existing commercial blue OLEDs. This endurance is attributed to the molecular stability endowed by the novel ligand design, which not only reinforces the metal center but also minimizes degradation reactions catalyzed by excited-state processes and charge imbalance.

From a device architecture perspective, the researchers integrated the iridium phosphorescent complexes into multi-layer OLED structures optimized for charge balance and thermal management. The strategic selection of charge transport layers and interface engineering further complemented the intrinsic molecular enhancements, enabling synergistic improvements in overall device efficiency and operational lifetime. This holistic approach underscores how molecular design, charge dynamics, and device engineering must coalesce to surmount the intrinsic limitations of deep-blue organic emitters.

The implications of this advancement extend far beyond displays. High-efficiency and stable deep-blue OLEDs pave the way for more energy-efficient solid-state lighting solutions with tailored spectral properties. The ability to generate more accurate blue wavelengths can also enhance color gamut reproduction and visual comfort in display technologies, addressing consumer demands for richer and more vibrant imagery. Additionally, the prolonged lifetime significantly reduces the environmental footprint associated with electronic waste, aligning with sustainable manufacturing goals.

The scientific community has recognized the strategic importance of charge transfer dynamics in governing OLED performance, but this research delivers actionable insights and practical molecular architectures that bring theoretical understanding into real-world application. Through state-of-the-art spectroscopic analyses and computational modeling, the team mapped out the electronic transitions and charge delocalization pathways, correlating these mechanisms directly with device-level improvements. This mechanistic clarity provides a blueprint for future material innovations across various optoelectronic platforms.

Notably, the researchers also investigated the effects of temperature and external stimuli on charge transfer behavior and device stability, demonstrating remarkable resilience under thermal cycling and high operational stress. Such robustness is critical for commercial adoption, where devices must withstand varying environmental conditions without degradation. The depth of characterization extends the relevance of the findings beyond fundamental science, emphasizing practicality and scalability.

Collaborations between chemists, physicists, and engineers were pivotal in realizing this breakthrough. The interdisciplinary nature of the project highlights the necessity of integrating expertise in organometallic chemistry, photophysics, and device fabrication. Such a collaborative framework accelerates innovation cycles and fosters the translation of lab-scale discoveries into market-ready technologies. The success of this study is a testament to the power of synergy in scientific research.

Looking ahead, the research opens avenues for further tuning of emission properties and charge transport by exploring alternative ligand frameworks and metal centers. The principles uncovered may also be applicable to other phosphorescent systems and even emerging classes of thermally activated delayed fluorescence (TADF) emitters. There is a growing excitement that these advancements will catalyze a new generation of high-performance OLEDs with customizable emission spectra and unprecedented durability.

The commercial impact of these findings is poised to be transformative. Deep-blue OLEDs with enhanced efficiency and stability are crucial for the next wave of ultra-high-definition displays, flexible screens, and wearable electronics. Companies investing in OLED technology stand to benefit by adopting these cutting-edge materials and design principles, potentially reducing manufacturing costs and improving product lifespan. As consumer demand for premium visual experiences grows, innovations like these will set new industry standards.

In conclusion, the recent study on high-efficiency and stable deep-blue iridium phosphorescent OLEDs marks a milestone in organic electronics research. By elucidating and optimizing charge transfer dynamics at the molecular level, the researchers have surmounted longstanding challenges in blue OLED performance, delivering devices that combine record efficiency with exceptional stability. This achievement not only enhances current display and lighting technologies but also enriches the scientific understanding of photophysical processes in complex organic-metal hybrid materials. The future of OLED innovation looks brighter than ever.

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Subject of Research:
Development of high-efficiency and stable deep-blue iridium phosphorescent organic light-emitting diodes (OLEDs) through enhanced charge transfer dynamics.

Article Title:
High-efficiency and stable deep-blue iridium phosphorescent OLEDs with enhanced charge transfer dynamics.

Article References:
Li, S., Tong, KN., Zhang, M. et al. High-efficiency and stable deep-blue iridium phosphorescent OLEDs with enhanced charge transfer dynamics. Light Sci Appl 15, 259 (2026). https://doi.org/10.1038/s41377-026-02264-y

Image Credits: AI Generated

DOI: 02 June 2026

Keywords:
Deep-blue OLEDs, iridium phosphorescent complexes, charge transfer dynamics, organic light-emitting diodes, device stability, external quantum efficiency, ligand design, photophysics, solid-state lighting, optoelectronics

In the evolving landscape of food packaging technology, scientists have long sought sustainable materials that not only preserve food quality but also extend shelf life without compromising safety or environmental standards. Recent breakthroughs have emerged from the realm of nanotechnology, where researchers have succeeded in unifying photocatalytic and antimicrobial functionalities within a single material system. This advancement has culminated in the development of a novel low-density polyethylene (LDPE) nanocomposite, doped with zinc oxide (ZnO) nanoparticles, exhibiting a new paradigm called the Minimum Integrated Functional Concentration (MIFC). This innovative approach signifies a monumental stride towards GRAS-compliant (Generally Recognized As Safe) active food packaging with profound implications for global food security and waste reduction.

The genesis of this breakthrough resides in the inherent challenges tied to active packaging materials. Traditional packaging often falls short in mitigating microbial contamination or oxidative degradation, leading to rapid spoilage and potential foodborne illnesses. Incorporating antimicrobial agents into packaging films has been attempted, yet the trade-offs between efficacy, safety, and regulatory acceptance have stymied widespread adoption. Thus, marrying photocatalytic activity—which can enable the degradation of organic contaminants and microbial cells under light exposure—with antimicrobial potency in a manner compliant with food safety norms represents an unprecedented technical accomplishment.

Central to this technology is the utilization of ZnO nanoparticles embedded within an LDPE matrix. ZnO has garnered significant interest due to its semiconductor properties and recognized antimicrobial efficacy. When subjected to ultraviolet or visible light, ZnO nanoparticles exhibit photocatalytic activity by generating reactive oxygen species (ROS), including hydroxyl radicals and superoxide anions. These ROS are highly effective in disrupting microbial cell walls and catalyzing the breakdown of organic pollutants. However, conventional applications have had to balance the ZnO concentration meticulously—too low and the activity is insufficient; too high, and the material can compromise mechanical properties or introduce toxicity concerns.

The novel framework of MIFC ingeniously quantifies the lowest concentration threshold at which the integrated functionalities of photocatalytic and antimicrobial effects synergistically manifest without crossing safety boundaries. This parameter indicates a precise formulation wherein ZnO nanoparticles suffice to maintain antimicrobial activity under packaging conditions while enabling photocatalytic degradation of contaminants in situ. The integration within the LDPE substrate ensures the mechanical integrity and flexibility expected from commercial packaging films, all while aligning with GRAS standards to reassure consumers and regulatory bodies alike.

In the engineered LDPE/ZnO nanocomposite, extensive physicochemical characterization elucidates the dispersion quality and interaction dynamics between nanoparticles and polymer chains. Optimized uniform dispersion is critical to maximize surface exposure of ZnO’s active sites and ensure consistent functionality throughout the packaging material. Advanced microscopy and spectroscopy techniques reveal that ZnO nanoparticles form a homogenous network, eschewing agglomeration issues that would otherwise deteriorate performance or produce structural weak points.

Thermal and mechanical analyses affirm that the nanocomposite retains the requisite flexibility, tensile strength, and thermal stability essential for commercial food packaging applications. Moreover, ultraviolet-visible (UV-Vis) reflectance studies demonstrate enhanced light absorption by the nanocomposite, facilitating effective photocatalytic activation under typical indoor and retail lighting conditions. This aspect is particularly significant as it obviates the dependency on specialized UV light sources, making the technology viable in real-world storage environments.

The antimicrobial efficacy of the LDPE/ZnO nanocomposite undergoes rigorous evaluation against a broad spectrum of foodborne pathogens, including Gram-positive and Gram-negative bacteria, molds, and yeasts. Results indicate a substantial reduction in microbial colonies over 24 to 72 hours, showcasing a lasting protective effect. Simultaneously, the photocatalytic activity accelerates the degradation of organic residues and biofilms potentially responsible for secondary contamination, thus extending the safety margin beyond mere microbial growth inhibition.

Safety validation studies affirm that the ZnO loading corresponding to MIFC does not elicit cytotoxic or genotoxic effects in food simulants, aligning with GRAS criteria. This finding is pivotal as it strategically positions the technology for regulatory approval and consumer acceptance, mitigating longstanding concerns about nanoparticle migration or adverse health impacts stemming from nanomaterials in direct food contact.

Beyond the laboratory, this technological innovation addresses pressing global challenges such as food waste reduction and sustainability. By actively protecting food from spoilage, this smart packaging can significantly curtail the environmental footprint associated with discarded food and excessive reliance on preservatives. Moreover, the LDPE base material is amenable to existing recycling processes, ensuring that incorporation of ZnO nanoparticles does not hinder circular economy initiatives.

The hybrid functionality of the LDPE/ZnO nanocomposite also opens new avenues for multifunctional packaging designs. By tuning the nanoparticle size, morphology, and concentration, packaging manufacturers can tailor performance attributes to specific food types, storage conditions, or shelf life targets. This versatility paves the way for customizable solutions that address diverse market needs while adhering to stringent food safety standards.

Intriguingly, the research team has hypothesized that the MIFC model is extensible beyond ZnO-based systems, potentially enabling the integration of other photocatalytic nanomaterials such as TiO2 or doped semiconductors. Such adaptability could usher in a new generation of active packaging materials harnessing multiple antimicrobial mechanisms alongside photo-induced degradation pathways, thereby amplifying protective efficacy.

This pioneering research underscores the vital role of interdisciplinary collaboration melding materials science, microbiology, and food engineering. The strategic synthesis and nanoscale engineering of the LDPE/ZnO platform underpin the remarkable leap from conceptual antimicrobial barriers to agile, light-activated, and safety-compliant active packaging films. As the global food supply chain grapples with mounting pressures from climate change, resource scarcity, and population growth, innovations such as MIFC-centric nanocomposites represent a beacon of technological hope.

Industry stakeholders are taking note of these findings, anticipating regulatory submissions, pilot-scale trials, and eventual commercial deployment within the next few years. Such transitions hinge on demonstrating scalability, cost-effectiveness, and compatibility with current packaging manufacturing infrastructure—parameters that initial feasibility assessments suggest are attainable.

In conclusion, the Minimum Integrated Functional Concentration concept embodied in these GRAS-compliant LDPE/ZnO nanocomposites heralds a transformative leap forward in active food packaging technology. By harmonizing photocatalytic and antimicrobial modes within a single material platform optimized for safety and performance, this approach holds the promise of substantially enhancing food preservation, reducing waste, and safeguarding consumer health. As this research progresses towards real-world application, it stands to redefine expectations for what smart packaging can accomplish in the quest for more sustainable and secure global food systems.

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Subject of Research: Development of an active food packaging material combining photocatalytic and antimicrobial properties using a GRAS-compliant LDPE/ZnO nanocomposite.

Article Title: Minimum Integrated Functional Concentration (MIFC), unifying photocatalytic and antimicrobial modes in a GRAS-compliant LDPE/ZnO nanocomposite for active food packaging.

Article References: Dolatabadi, M., Qabus, S.H.H., Arabshahi, S. et al. Minimum Integrated Functional Concentration (MIFC), unifying photocatalytic and antimicrobial modes in a GRAS-compliant LDPE/ZnO nanocomposite for active food packaging. Sci Rep (2026). https://doi.org/10.1038/s41598-026-54427-x

Image Credits: AI Generated

Researchers have discovered that atoms can be mixed, separated, and recombined within the same experiment, providing a pathway to a record-breaking catalyst for green hydrogen production. In their study, the team created nanoscale particles containing only a few dozen platinum and nickel atoms and observed unusual dynamic behavior in direct space and in real time. As the two metals separate from one another while maintaining an interface, they become highly active for electrochemical water splitting, leading to efficient hydrogen evolution.

In a groundbreaking development poised to reshape the future of sustainable materials, researchers have uncovered an innovative method to convert one of the world’s most ubiquitous waste products—spent coffee grounds—into a high-performance, biodegradable thermal insulation material. This pioneering work promises to mitigate environmental waste concerns while providing an eco-friendly alternative for thermal management across a broad spectrum of industries including building construction, packaging, and renewable energy systems.

The research, spearheaded by Sung Jin Kim and Seong Yun Kim, culminated in the creation of a fully green composite that harnesses the potential of biochar derived from spent coffee grounds integrated with ethyl cellulose, a naturally sourced polymer. This synergy yielded an extraordinary thermal conductivity of 0.04 W m⁻¹ K⁻¹, a figure that places this novel composite on par with commercial expanded polystyrene (EPS), a widely used but petroleum-based insulation material. Unlike EPS, however, the new composite distinguishes itself through its renewable components and demonstrated biodegradability when exposed to enzymatic treatment, marking a significant stride in environmental responsibility.

The motivation behind this research stems from the persistent global burden posed by coffee waste. Despite the prodigious quantities of spent coffee grounds generated daily, these residues primarily end up in landfills or are incinerated, raising environmental concerns associated with waste management and carbon emissions. The authors’ approach leverages carbonization, a simple yet effective process to convert the coffee waste into biochar—a porous carbon-rich material. By meticulously calibrating the carbonization temperature and atmospheric conditions, they identified that biochar produced at 700 °C under ambient conditions optimally balanced high porosity with moderate graphitic structuring, essential characteristics for superior thermal insulation performance.

The intrinsic mechanism behind this insulation lies in the microstructure of biochar. Its highly porous nature traps air within the pores, significantly impeding heat transfer through conduction. Achieving this porous network’s stability during composite fabrication posed a formidable challenge, as conventional polymer matrices tend to infiltrate and fill void spaces, thereby compromising insulation efficacy. Innovatively, the team deployed a pore restoration technique involving premixing biochar with propylene glycol before its integration with ethyl cellulose. This strategic step successfully preserved the porosity by preventing pore collapse and polymer intrusion, ensuring that the composite maintained its critical insulating architecture.

Extensive thermal characterization revealed that the resulting composite, designated as EC/SB700/PG-25, exhibits a drastic reduction in thermal conductivity—approximately one-sixth that of pure ethyl cellulose. Such performance enhancement validates the design principle, highlighting the composite’s potential as a sustainable substitute for EPS without sacrificing insulation functionality. Complementing experimental results, finite element modeling elucidated that the lauded thermal performance arises synergistically from three key parameters: the porous matrix’s inherent air entrapment, the thermal interfacial resistance between biochar particles and polymer, and the fine-tuned graphitic domains within the biochar contributing to controlled phonon scattering.

A compelling facet of this research is the composite’s biodegradation behavior, which stands in stark contrast to conventional insulation materials notorious for persistence in landfills. The composite exhibited accelerated degradation in the presence of cellulase enzymes, attributed to enhanced water and enzyme infiltration facilitated by the biochar-polymer interfacial zones. This rapid breakdown heralds a reduction of long-term ecological footprints and offers a practical solution to the mounting challenge of insulating material disposal.

To examine practical applications, the researchers integrated their biochar composite into a scaled-down building-integrated photovoltaic (BIPV) system, serving as a thermal management layer. Their experiments confirmed that the biochar composite effectively reduced heat transfer beneath photovoltaic cells, mirroring the performance of traditional EPS insulators. Controlling thermal load in BIPV systems is critical to maintaining efficiency, and this demonstration underscores the composite’s feasibility for real-world energy-saving technologies.

Professor Seong Yun Kim emphasized the dual advantage of this innovation, highlighting its contribution to circular economy principles by simultaneously tackling waste valorization and energy efficiency. Such materials are not merely substitutes but represent transformative solutions that align environmental sustainability with high-performance engineering requirements, potentially altering the insulation market’s trajectory away from fossil fuel dependency.

The broader implications for construction, packaging, and transportation industries are profound. With global efforts intensifying to mitigate climate change, materials that reduce energy consumption during operation and alleviate waste management burdens offer compelling benefits. Utilizing abundant agricultural and food processing residues such as coffee grounds addresses both resource scarcity and ecological impact, advancing a holistic approach to material science challenges.

This breakthrough aligns with the ongoing shift towards green chemistry and materials science, where bio-based, non-toxic, and renewable feedstocks gain prominence. The incorporation of ethyl cellulose, sourced from natural polymers, further cements the composite’s circular credentials and compatibility with existing biodegradation pathways. The intuitive processing steps and ambient carbonization conditions also suggest scalability, enhancing the material’s appeal for industrial adoption.

In summary, the transformation of spent coffee grounds into a highly porous biochar combined with ethyl cellulose culminates in a biodegradable, sustainable, and thermally efficient composite. This material matches or exceeds the insulation standards of petroleum-derived counterparts while offering a conscientious environmental profile. As nations, companies, and consumers increasingly demand greener alternatives, such innovations may pave the way for next-generation building materials that marry high-performance with ecological stewardship.

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Subject of Research: Development of fully green thermal insulating composites from spent coffee ground biochar and ethyl cellulose.

Article Title: Highly porous biochar from spent coffee ground for fully green thermal insulating composites with thermal conductivity of 0.04 W m⁻¹ K⁻¹.

News Publication Date: 10 March 2026.

Web References:
http://dx.doi.org/10.1007/s42773-026-00584-1

References:
Kim, S.J., Kim, S.Y. Highly porous biochar from spent coffee ground for fully green thermal insulating composites with thermal conductivity of 0.04 W m⁻¹ K⁻¹. Biochar 8, 73 (2026).

Image Credits: Sung Jin Kim & Seong Yun Kim

Keywords

biochar, spent coffee grounds, thermal insulation, biodegradable composites, ethyl cellulose, porous materials, renewable materials, waste upcycling, green building materials, energy efficiency, sustainable composites, carbonization

Scientists from the Advanced Robotics Research Center at the Korea Institute of Machinery and Materials (KIMM) have developed a new process to weave ultra-thin fibers of shape-memory alloy (SMA) into fabric artificial muscles, enabling wearable robotic clothing that tests have shown can increase the wearer’s strength and reduce muscle load by up to 40%.

Although wearable robots designed with the new fabric-weaving process are currently limited to the laboratory phase, the KIMM research team behind the breakthrough method is already working on prototype designs for individuals suffering from strength and mobility limitations, with the ultimate goal of finding a commercial partner to bring their super-strength fabric manufacturing process to the wider marketplace.

Current Wearable Robot Technologies Face Severe Limitations

In an email to The Debrief, Dr. Cheol Hoon Park, Principal Researcher at KIMM’s Advanced Robotics Research Center and the leader of the wearable robot project, explained that many countries are entering a “super-aged” phase of society, and the demand for wearable robot technology that can increase strength and mobility is expected to dramatically increase.

However, Dr. Park noted that for such technologies to become more widely available, the limitations of current technologies must be overcome.

“They must be lightweight, comfortable to wear, and affordable,” the project leader explained.

For example, conventional wearable robots designed to provide strength and support to multiple joints, such as the shoulder, elbow, and wrist, rely on heavy, noisy motors or pneumatic actuators. The research team noted that these components make systems bulky, expensive, and uncomfortable to wear, especially during extended use. The answer has been an increased reliance on simpler, single-joint, wearable robots. Still, assisting large, complex joints like the shoulder has remained a major obstacle.

Now, Dr. Park and the KIMM team said they’ve created a system for weaving fabric muscles into fabric, resulting in a scalable method for mass-producing wearable-robot clothing that is quiet, streamlined, easy to use, and consumes very little power.

Heat From a Battery Pack Causes Artificial Muscle Fibers to Contract

Instead of air-powered actuators or bulky electric motors that add power to human muscles and joints, Dr. Park’s team created fabric muscles using small fibers of a material called shape-memory alloy. SMAs are materials that regain their original shape when exposed to elevated temperatures or pressures.

For this application, the team used an SMA wire with a diameter of 25 μm, or roughly one-fourth the width of a human hair. Next, the KIMM team processed the individual wires into coil-shaped ‘yarn.’ Like traditional yarn, this SMA yarn can enable the continuous weaving of fabric muscles.

When asked by The Debrief how their fabric muscle wearable robot works, Dr. Park explained that the SMA coil fibers that make up the muscles contract when heated to “about 40–50 °C.” However, he notes, the user is unlikely to notice the material being heated, so it can exert a directional force to assist muscle movement and reduce joint load, “thanks to an insulating fabric layer.”

“Like human muscles, the fabric muscle contracts as it heats up and relaxes as it cools down,” Dr. Park told The Debrief. “Cooling fans are not required when the user simply holds a load, but for repetitive lifting tasks, faster cooling is needed, so the fans help accelerate the process.” Park added that fans can be integrated in future consumer versions of the jacket, “depending on the use case.”

The wearable robot is powered by a 200 g battery pack mounted on the back of the jacket, which also includes a compact controller to change settings. Park said that the contraction force exerted by the fabric muscles can be altered by changing “the amount and duration of electric current” supplied to the system’s SMA fibers.

Depending on the setting level the user selects and their activity level, Dr. Park told The Debrief that the system “can typically operate for about four hours on a single charge.”

Tests Show 40% Reduced Muscle Effort and 57% Increase in Range of Motion

According to the team’s announcement, the KIMM team’s prototype wearable robot, a jacket with the SMA fiber muscles built in, was able to simultaneously assist the wearer’s elbow, shoulder, and waist. Tests showed that the less-than-2-kilogram jacket reduced muscle effort by more than 40% during repetitive physical tasks. Notably, the 10g of wearable robot fabric at the core of the system can light 10-15 kilograms (22-33 lbs.)

 

A more complex shoulder-assist, wearable robot weighing just 840 grams (less than 2 pounds), tested in clinical trials at Seoul National University Hospital (SNUH) on patients with muscular weakness, including those with Duchenne muscular dystrophy, improved average shoulder movement range by over 57%.

When discussing the next phase of development, Dr. Park told The Debrief that they are currently “developing and evaluating a prototype of the clothing-type wearable robot in the form of pants.”

“We expect that it could help people who have difficulty walking on slopes or stairs, or standing for long periods of time,” the project leader explained.

Wearable Robot Clothing Could Reach the Market Within 1-2 Years After Agreement

Although the current version of the wearable is not yet commercially available, Dr. Park noted that the core technology for weaving SMA fibers into fabric muscles was developed at a non-profit research institute, “so it will need to be transferred to an industrial partner for commercialization.”

We have already developed both the manufacturing equipment for mass-producing the fabric muscle — the core component — and a working prototype of the wearable robot,” he added.

Although there is no pending agreement with a commercial partner to date, Dr. Park told The Debrief that once they transfer their technology to a commercial partner, they expect it could reach the commercial market “within one to two years.”

Although there are potential uses for the team’s fiber muscle-weaving process, including enhanced strength “super soldiers,” Dr. Park told The Debrief, “We hope that the fabric muscle we developed—and the clothing-type wearable robot based on it—will help make wearable robotics more accessible and ultimately improve the quality of life for many people.”

The paper “Soft Exosuit Based on Fabric Muscle to Assist Shoulder Joint Movements in Patients With Neuromuscular Diseases” was published in IEEE Transactions on Neural Systems and Rehabilitation Engineering.

Christopher Plain is a Science Fiction and Fantasy novelist and Head Science Writer at The Debrief. Follow and connect with him on X, learn about his books at plainfiction.com, or email him directly at christopher@thedebrief.org.

Photonic glasses containing gold-cored, silica-shelled nanoparticles can produce high-purity colours across the visible spectrum. Crucially, the colours are independent of viewing angle. Developed by researchers in Korea, their design avoids the short-wavelength scattering that has prevented the attainment of a true red – and blurred other colours – in previous photonic glasses.

Synthetic materials are usually coloured using pigments, such as those found in dyes or paints. A pigment has a chemical composition that causes it to reflect light at certain wavelengths and absorb light at other wavelengths. Nature, however, makes widespread use of structural colour, whereby the physical structure of a material dictates which wavelengths are reflected and which are absorbed. A familiar example is iridescence, which is responsible for rainbow-like colours on some plants and animals.

Creating colour using structure rather than chemistry has several advantages. One is that there are no chemical chromophores to be bleached by sunlight, so the colour tends to be more durable. Another benefit is that there is no dye to leach if the material comes into contact with water or another solvent.

While structural colour can be created using traditional photonic crystals, these can be tricky to produce controllably. Moreover, a surface that relies on interference effects is inevitably iridescent – which means that its colour changes with the viewing angle.

Short-range order

One solution is colloidal photonic glasses, which are not physically textured but have particles such as silica or polymers dispersed throughout them with short-range order. These can be produced simply by solution processing, and their colour does not vary with viewing angle. The principal problem with these glasses is the attainment of colour purity – especially in the red. The challenge is that the glasses scatter light more effectively at shorter (bluer) wavelengths owing to Rayleigh scattering. This effect makes the sky appear blue and adds unwanted blue light to structural colour.

In the new work, nanophotonics expert Seungwoo Lee of Korea University in Seoul and colleagues synthesized 230 nm core–shell nanoparticles in which silica surrounds a 20 nm gold cluster. This has a plasmonic resonance that absorbs shorter wavelengths. The researchers then dispersed the nanoparticles in ethoxylated trimethylolpropane triacrylate. This is a photocurable resin that has a very similar refractive index as the nanoparticles. The resin was applied to surfaces by painting or solution deposition and then cured under ultraviolet light.

The resulting photonic glass scatters red light randomly, while absorbing shorter wavelengths. Lee stresses that this is different from a traditional paint. “The reflected colour is determined by particle size, spacing, refractive-index contrast, and the degree of structural order, rather than by a molecular chromophore alone,” he says. When the researchers reduced the size of the nanoparticle shells, first to 180 nm and then to 160 nm, they found that they packed more closely together, producing first green and then deep blue colours.

The explanation for the blue scattering is more subtle than for the red: “The gold core is not needed to ‘make’ blue in the same way that a blue dye would,” explains Lee. “However, the gold core can still improve perceived colour purity by reducing broadband diffuse scattering and nonresonant background light.” explains Lee “Without this suppression, silica-only photonic glasses tend to look milky or whitish because many wavelengths are scattered together.”

Durable coatings

The researchers are now exploring several possible extensions of their research. They believe that the work could provide easily applied coatings that are durable as the light scattering comes from within the material structure rather from than a surface pigment.

They also believe it could have anti-counterfeiting properties: “In a normal ink or paint, its colour mainly originates from chemical pigments or dyes,” says Lee; “Our material produces a nanoscale structural signature: a specific reflectance spectrum, bandwidth, angular response, and microstructural arrangement determined by the particle diameter, core–shell geometry, refractive-index matching, volume fraction, and assembly pathway. This gives several possible authentication handles.”

Lee believes that it should be possible to reduce the cost of the material using a metal that is cheaper than gold. However, the precious metal is only 0.022% of the film by weight, so the technology may already be economically viable.

The film is described in Proceedings of the National Academy of Sciences.

“I think it’s really neat,” says materials scientist Aaswath Raman of the University of California, Los Angeles. “The concept of structural colour has been around for a really long time but to me it’s, like, the last steps before we see it out it the real world.”

He says the largest problems he foresees are the simple economics of competing with industrially-optimized paint industry – even if the technology is, in principle, superior. Nevertheless, he says, “of the technologies we see in research this is likely quite a good candidate for commercialization”. The next step, he says, is to actually find a “first use” application – he suspects the aerospace industry, which values ultralight, durable coatings, could be a candidate.

The post Photonic glasses deliver angle-independent structural colour, including reds appeared first on Physics World.

In an era increasingly defined by the confluence of materials science innovation and data-driven methodologies, the International Conference on Advanced Functional Materials and Technologies (ICAFMT) stands as a pivotal forum. Set to convene in Dongguan, China, from October 23 to 25, 2026, this event promises to be a landmark gathering for scholars, researchers, and industry leaders aiming to shape the future of materials science. The conference will explore the latest strides in functional materials, encompassing fields from energy storage and advanced computational techniques to biomaterials and metallic alloys.

ICAFMT 2026 brings together an outstanding cadre of thought leaders and institutional representatives from around the globe. Chaired by Weihua Wang of the Dongguan Institute of Materials Science and Technology, alongside other eminent figures such as Jinkui Zhao, Gian-Marco Rignanese, and Torsten Brezesinski, the meeting reflects a uniquely international and interdisciplinary spirit. The organizing committee, drawn from prestigious universities and research institutions including Peking University, The University of Hong Kong, and École Polytechnique de Louvain, underscores the global collaboration permeating the event.

The conference program distinguishes itself through a suite of parallel sessions, each dedicated to cutting-edge research and emerging technologies. One crucial session focuses on electronic and information-processing materials, an arena witnessing revolutionary advances as the world pivots toward smarter, faster computing systems. Here, researchers will delve into novel semiconductors, quantum materials, and nanoscale architectures that redefine information handling and storage at the atomic scale.

Energy storage and conversion, critical for sustainable development, constitute another core theme. With surging global demand for efficient and durable batteries, supercapacitors, and beyond-lithium chemistries, ICAFMT will enable lively discussions on advanced materials facilitating higher energy densities, faster charge rates, and longer lifespans. Experts like Torsten Brezesinski, known for his pioneering work in electrode materials, are expected to lead discourse on engineering design at both the nano- and microscale to optimize performance.

Biomaterials research, an inherently interdisciplinary domain, also features prominently. Advances here promise transformative impacts on healthcare, ranging from regenerative medicine scaffolds to biocompatible implants and drug delivery systems. The conference’s emphasis on biomaterials reflects the growing integration of biology with materials science, leveraging molecular engineering, additive manufacturing, and computational modeling to enhance functional efficacy.

Metals and alloys remain foundational to modern technologies, and the session on high-performance metallic materials addresses the relentless pursuit of materials that combine strength, ductility, corrosion resistance, and lightweight properties. Discussions will cover alloy composition design, processing techniques such as severe plastic deformation, and characterization methods that uncover microstructural dynamics influencing macroscopic behavior.

One of the most avant-garde aspects of ICAFMT 2026 is its spotlight on AI-driven materials discovery and computational materials science. Harnessing machine learning algorithms, high-throughput simulations, and big data analytics, researchers aim to accelerate the design and optimization of materials with tailored properties. This session symbolizes the transformative role of artificial intelligence in shifting material development cycles from years or decades to mere months, heralding an era of rapid innovation.

The conference also dedicates attention to advanced characterization and measurement techniques, vital for resolving materials’ complex structures and properties. Techniques ranging from synchrotron-based X-ray spectroscopy to atomic force microscopy and in situ electron microscopy will be examined, reflecting the trend toward multimodal, high-resolution analyses that integrate experimental and theoretical insights for comprehensive understanding.

The agenda of ICAFMT 2026 is thoughtfully constructed, beginning with a registration and welcome reception on October 23, followed by plenary talks and multiple parallel sessions on the 24th and 25th of October. This structure promotes deep engagement, knowledge exchange, and networking across thematic areas while maintaining flexibility for participants to choose sessions aligned with their expertise and interests.

Early career researchers and students are notably encouraged to participate, benefitting from discounted registration fees and opportunities to present their work on an international stage. This strategic inclusion aims to cultivate the next generation of materials scientists who will navigate and contribute to the rapidly evolving landscape of functional materials and advanced technologies.

Held at the Dongguan Institute of Materials Science and Technology, a hub recognized for its innovative research, the venue provides state-of-the-art facilities tailored to accommodate the technological demands and collaborative spirit of the conference. The locale in Dongguan, Guangdong Province, also offers an enriching cultural and industrial milieu conducive to idea exchange and partnerships.

With registration open ahead of key deadlines such as the abstract submission closing on September 15, 2026, ICAFMT invites researchers worldwide to contribute their latest findings and perspectives. The combination of rigorous scientific discourse and strategic networking at this conference is poised to accelerate breakthroughs across various domains of materials science, from fundamental research to practical applications in energy, electronics, biomedical sectors, and beyond.

The dynamic integration of AI and computational approaches featured at ICAFMT underscores a paradigm shift in how materials challenges are addressed, enabling researchers to traverse vast chemical spaces and simulate complex behaviors with unprecedented speed and accuracy. These advances promise to underpin future innovations in sustainable technologies, quantum devices, and novel biomaterials, paving the way for scientific and technological revolutions.

As the materials science community anticipates this event, the International Conference on Advanced Functional Materials and Technologies offers a unique platform to converge expertise, spark interdisciplinary collaborations, and unveil next-generation materials destined to transform industries and society at large. It is a seminal event not only reflecting current trends but also proactively shaping the trajectory of materials research and development on a global scale.

Subject of Research: Advanced Functional Materials and Technologies
Article Title: International Conference on Advanced Functional Materials and Technologies (ICAFMT) to Illuminate Future Innovations in Materials Science
News Publication Date: Not specified
Web References: https://icafmt.aiforsci.net/
Image Credits: Materials Futures AI for Science

Keywords

Materials Science, Functional Materials, Advanced Technologies, AI in Materials Discovery, Biomaterials, Energy Storage, Metallic Alloys, Computational Materials Science, Characterization Techniques, International Conference

In a groundbreaking advancement poised to redefine materials science and molecular engineering, researchers have unveiled a novel strategy for fabricating ultrathin, free-standing two-dimensional (2D) peptide crystals. These atomically precise architectures mimic biological membranes’ intricate enantioselective recognition capabilities, representing the first substantial leap since the initial theoretical propositions dating back to 1975. This new metal-directed β-sheet-like assembly paradigm answers long-standing challenges in engineering 2D crystalline peptide materials with high structural order and stability, opening expansive avenues for bio-inspired applications in sensing, catalysis, and pharmaceuticals.

The meticulous construction of long-range ordered intralayer hydrogen-bonded networks in peptides has historically impeded efforts to realize truly ultrathin, single-crystalline 2D peptide materials. The dynamic nature of peptide interactions often results in disordered aggregates rather than extended ordered lattices, limiting functional control. By deploying a metal-directed self-assembly mechanism, the team cleverly harnesses coordination chemistry to template and guide the formation of extensive β-sheet-like networks within an ultrathin 2D plane. This design principle enables the emergence of either parallel or antiparallel β-sheet arrangements with tunable sequences, chirality, and side-chain functionalities, all encoded at the molecular level.

A particularly intriguing aspect of the method is the controlled induction of antiparallel β-sheet packing, which imparts significant mechanical interlocking within the peptide sheets. This topological interdigitation furnishes the 2D lattice with exceptional mechanical robustness and thermal stability, a feature markedly absent in previously reported peptide assemblies. The intralayer mechanical interlocking not only enhances durability but also imparts resistance to delamination and structural deformation at the nanoscale, critical for practical application of these ultrathin materials.

The researchers performed extensive crystallographic characterization that uncovered the nuanced interplay of metal coordination geometry, peptide backbone conformation, and side-chain orientation governing the formation of these 2D lattices. High-resolution X-ray diffraction data revealed how diverse metal ions act as pivotal nodes directing the spatial arrangement of peptide strands, thereby dictating the periodicity and symmetry of the crystal lattice. This insight affords unprecedented modular control over the crystalline architecture, allowing for the customization of surface chemistry and internal structural motifs with atomic precision.

Upon successful crystallization, these layered peptide materials yielded single-crystalline nanosheets amenable to mechanical exfoliation. The resulting free-standing nanosheets possess a thickness down to a few nanometers, preserving their long-range order and crystallinity. Their ultrathin geometry renders them exquisitely sensitive to molecular recognition events, exemplified by their selective binding to glucocorticoids and various chiral pharmaceutical molecules. Remarkably, these nanosheets exhibit an enantioselectivity factor as high as 20.9, outperforming many conventional chiral selectors and underscoring their immense potential for stereoselective sensing and separation technologies.

The implications of this work stretch far beyond the immediate demonstration of structural novelty. By effectively combining such programmable peptide sequencing with metal-ion-directed assembly, the team illustrates a generalizable platform for engineering 2D biomimetic materials with complex, tunable functionalities. This approach enables a level of precision in surface presentation and molecular recognition previously achievable only in biological systems, now translatable into robust, synthetic materials poised for widespread technological integration.

Notably, the ability to program chirality and sequence at the molecular scale yields versatile peptide crystals that can be tailored to interact selectively with a broad spectrum of biomolecules and drug candidates. Such molecular finesse opens avenues for creating highly specific biosensors, enantioselective catalysts, and filtration membranes that operate with unprecedented efficiency and specificity. This customizability is crucial for addressing challenges in pharmaceutical manufacturing, diagnostics, and environmental monitoring.

Furthermore, the successful demonstration of antiparallel β-sheet interlocking invites a reevaluation of conventional wisdom regarding peptide-based material stability. Traditionally, β-sheet structures were recognized primarily for their biological relevance and propensity to aggregate into amyloids; this work transcends that paradigm by exploiting β-sheet motifs for durable, engineered 2D materials. It redefines the functional role of β-sheets from mere biological interactions to mechanically robust building blocks in synthetic nanoscale assemblies.

The interdisciplinary nature of this discovery exemplifies the synergy between coordination chemistry, peptide engineering, and materials science, revealing how principles from disparate fields can converge to solve persistent limitations. Metal ions, often secondary players in peptide self-assembly, emerge here as structural directors creating a lattice with controlled topology and enhanced function. This refined understanding encourages future explorations into other metal-peptide combinations, potentially unlocking myriad structural and functional variants.

Additionally, these ultrathin peptide crystals hold promising applications in the realm of drug delivery and pharmaceutical formulation, where enantioselective recognition is paramount. Their high specificity and strength suggest they could function as selective binding platforms or carriers, assisting in the targeted delivery of chiral drugs with improved efficacy and reduced side effects. This could signify a quantum leap forward in personalized medicine and stereochemically sensitive therapies.

The researchers also highlight the scalability potential of their assembly method, which, although demonstrated under controlled laboratory conditions, could be adapted for industrial-scale fabrication. Exfoliation techniques to produce free-standing nanosheets ensure compatibility with existing thin-film technologies and substrates, enabling integration into electronic, optical, or sensing devices. The atomic-level uniformity combined with mechanical robustness makes these peptide nanosheets ideal candidates for next-generation biointerfaces.

As the field progresses, this metal-directed β-sheet-like assembly platform might serve as a blueprint for incorporating other bio-inspired motifs, such as α-helices or coil structures, thus broadening the structural and functional repertoire of 2D peptide materials. Such innovations could lead to multifunctional nanosheets capable of complex biological functions, including catalysis, signal transduction, or molecular gating, further bridging the gap between synthetic and natural molecular machines.

In summation, this pioneering work redefines the frontier of peptide-based nanomaterials by actualizing free-standing ultrathin 2D peptide crystals with programmable sequence, chirality, and surface chemistry. By marrying metal coordination chemistry with peptide self-assembly, the researchers have unlocked a new realm of structurally ordered, mechanically robust, and functionally versatile biomimetic materials. The demonstrated enantioselective properties position these nanosheets as potent candidates for revolutionary advances in molecular recognition, biotechnology, and material science.

As the scientific community digests these findings, it becomes apparent that the fusion of synthetic peptides and metal-directed assembly will catalyze a surge in innovative 2D biomaterials, expanding the toolbox for engineers and chemists working toward mechanistic biomimicry and functional precision at atomic scales. This discovery not only provides a functional material but also sets a foundational methodology that future studies will undoubtedly build upon, heralding an exciting era in synthetic biointerface design.

The convergence of these insights acts as a clarion call for further exploration at the interface of peptide chemistry, nanotechnology, and materials science, with this work serving as a lodestar for novel molecular architectures that harness nature’s design principles with technological rigor. The era of atomically thin, single-crystalline peptide films has truly arrived, with transformative implications spanning across diverse scientific and industrial sectors.

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Subject of Research: Development and characterization of ultrathin, single-crystalline two-dimensional peptide crystals formed via metal-directed β-sheet-like assembly

Article Title: Free-standing ultrathin two-dimensional peptide crystals

Article References:
Wang, X., Yao, R., Yang, SL. et al. Free-standing ultrathin two-dimensional peptide crystals. Nat. Chem. (2026). https://doi.org/10.1038/s41557-026-02158-x

DOI: https://doi.org/10.1038/s41557-026-02158-x

As the world grapples with ever-increasing industrialization, the rise of oil spills and the discharge of oily wastewater have emerged as critical challenges threatening aquatic ecosystems and public health. Existing methods to separate oil from water—including burning, chemical dispersants, and mechanical skimming—have proven insufficient due to their secondary pollution risks, limited efficiency, and exorbitant costs. Addressing these issues, researchers from Hubei University and Wuhan University of Technology, led by Professors Chengkang Rao, Yan Xin, and Zhiguang Guo, have introduced a transformative class of biomimetic multi-responsive superwettable materials that redefine the paradigm of oil–water separation.

Traditional superwetting materials have relied on fixed wettability traits—either being superhydrophobic and superoleophilic to absorb oil or superhydrophilic and underwater superoleophobic to repel oil while allowing water through. However, these static characteristics become liabilities when membranes encounter complex or contaminated emulsions, leading to irreversible performance degradation. The innovative smart materials developed here overcome these challenges by exhibiting dynamic, reversible wettability switching, activated by external stimuli. This capacity allows the materials to adapt their oil/water affinity in real time, merging the selectivity of conventional membranes with the flexibility found in biological systems.

Fundamentally, these advances rest upon a sophisticated theoretical foundation integrating core wetting models: Young’s equation, the Wenzel model, and the Cassie–Baxter model. By mimicking the hierarchical micro- and nanostructures observed in nature and integrating surface chemical regulation, the researchers elucidate how superwettability and intelligent switching coexist synergistically. At a molecular scale, responsive functional groups such as PNIPAM polymers undergo conformational changes above their lower critical solution temperature (LCST), carboxyl groups shift protonation states with pH variations, and azobenzene moieties isomerize under UV irradiation. These nanoscale chemical transformations translate into macroscopic wettability shifts via hierarchical roughness designs, reversing intrusion pressures to toggle between oil-removing and water-removing states.

The team proposes a comprehensive, layered framework categorizing the systems: the outer layer delineates preparation techniques including layer-by-layer self-assembly, electrospinning, and surface-initiated atom transfer radical polymerization (SI-ATRP); the middle layer presents eight stimulus modalities—temperature, pH, light, electricity, gas, ion concentration, solvent environment, and multi-responsive synergies; and the inner core, inspired by the Taiji symbol, represents the fundamental interaction between “smart response” and wettable materials. This integrative approach not only advances understanding but also streamlines design principles.

Performance metrics across stimulus types are groundbreaking. Thermoresponsive membranes grafted with PNIPAM exhibit over 97.8% separation efficiency with 16 distinct emulsion types, dynamically toggling separation modes at 25°C and 45°C. pH-responsive sponges derived from tung oil demonstrate exceptional flux rates reaching 6,700 liters per square meter per hour with 99.9% efficiency and remarkable durability, enduring more than 1,000 compression cycles. Photocatalytic membranes using Fe/TiO₂ composites extend activity into visible light spectra, delivering fluxes exceeding 18,000 liters per square meter per hour alongside simultaneous degradation of organic dyes. Electric-responsive ZnO nanorod arrays enable wettability transitions within seconds at low voltages (around 15 volts), representing a safer and more energy-efficient alternative to previous systems leveraging kilovolt-range electric fields.

A pivotal breakthrough highlighted is the stimulus-responsive catalytic cleaning effect, which systematically addresses membrane fouling—a longstanding obstacle in oil-water separation. The researchers unravel a four-tier synergistic mechanism combining the physical barrier of a surface hydration layer with catalytically generated reactive oxygen species (ROS). Metal active sites, including Mn³⁺, Fe²⁺/Fe³⁺, and Mo⁶⁺, when activated by hydrogen peroxide, peroxymonosulfate (PMS), or light irradiation, generate ROS capable of mineralizing hydrophobic contaminants. Simultaneously, microbubbles physically dislodge oil molecules. This ‘separation plus self-cleaning’ paradigm drastically reduces membrane recovery times from over four minutes under hydrodynamic cleaning to less than one minute, enhancing longevity and operational efficiency.

The review also introduces a meticulous comparative framework, grounded in multi-dimensional benchmarking tables that evaluate response speed, regulation precision, reversibility, and energy consumption across various stimuli. This standardized evaluation provides researchers with much-needed clarity in selecting the optimal responsive mechanism for specific scenarios, fostering accelerated innovation and tailored applications.

Demonstrations of practical applicability abound. Large-scale CO₂-responsive membranes with an active area of 3,600 cm² have undergone pilot testing, validating scalability. Diatomaceous earth coatings have proven robust under simulated marine environments, ensuring environmental resilience. Multifunctional membranes have achieved exemplary 99.9% oil-water separation rates while simultaneously removing up to 97.6% of dyes from textile wastewater, marking significant steps toward industrial deployment.

Looking ahead, three strategic trajectories emerge as priorities. First, the development of self-healing micro-/nanostructures employing fluorine-free surface modifications promises eco-friendly and durable materials. Second, continuous manufacturing techniques such as roll-to-roll coating and 3D printing are envisioned to enable cost-effective mass production leveraging biomass waste resources. Third, embedding artificial intelligence within material systems could usher in intelligent sensing and adaptive regulatory loops, enabling autonomous operation responsive to fluctuating environmental conditions.

This comprehensive work elevates smart-responsive superwettable materials from passive filtration tools to dynamic, intelligent platforms capable of sensing, decision-making, and responding to complex contamination challenges in real time. The convergence of high separation efficiency, adaptive intelligence, and sustainable operation charts a bold new direction for next-generation water treatment technologies. The collaborative efforts by these teams at Hubei University and Wuhan University of Technology herald an exciting frontier where environmental remediations are both smart and sustainable.

As environmental pressures continue to mount, such innovative material systems offer hope for a cleaner, safer future—one where innovation at the molecular and structural levels meets urgent global needs with unprecedented efficacy.

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Subject of Research: Biomimetic multi-responsive superwettable materials for oil–water separation

Article Title: Biomimetic Multi‑Responsive Superwettable Materials for Oil–Water Separation

News Publication Date: 21-May-2026

Web References: DOI: 10.1007/s40820-026-02222-8

Image Credits: Chengkang Rao, Yan Xin, Zhiguang Guo, Weimin Liu

Keywords: Materials science, Superwettable materials, Oil-water separation, Stimulus-responsive materials, Smart membranes, Environmental remediation

In today’s technologies, mechanical mechanisms generally provide the brawn while electronics supplies the brains. This is partly because it is challenging to write information into mechanical memories without resetting each bit individually. However, that could change as researchers led by Pedro Reis at École Polytechnique Fédérale de Lausanne in Switzerland and Martin van Hecke at AMOLF in the Netherlands have now found a practical means of writing mechanical bits. Their technique, which they describe in Science Advances, uses structures that resemble children’s slap bracelets placed on a rotating turntable. While they acknowledge it is unlikely to replace electronic memories, they argue that it could have specialist applications and might produce insights that translate into electronic innovations.

“The framework we propose could be very useful, for example, in the domain of physical intelligence, where you provide hardware with capabilities that don’t require essentially a brain or an electronic control system to do individual tasks,” Reis says.

Mechanics for memory

Reis and van Hecke’s interest in mechanical memory stems from their research on metamaterials, which are materials that are defined not just by their composition, but also by the structures within them. Mechanical systems offer a tangible means of getting to grips with the complex behaviour of these metamaterials. “Often, all sorts of things that we do rely on nonlinear responses,” van Hecke notes, adding that such responses are much easier to study in mechanical systems than in optical devices.

A metamaterial made up of an array of switchable mechanical elements could function as a form of mechanical memory. However, to be practical, it needs to be possible to flip the states of individual mechanical bits using global controls, as opposed to addressing them individually. Otherwise, writing data will be very fiddly.

A solution emerged from Reis’ interest in rotating platforms, which he describes as “a very versatile way of loading mechanical systems”. While the pair had been friends for more than two decades, they had been working independently until, during a visit, the penny dropped and they realized that placing the metamaterial array on a rotating platform could provide the control they needed.

Because the angular velocity of the platform sends its momentum outwards, each mechanical object experiences a force in the radial direction, known as the centrifugal force. If this angular velocity is not constant, the object will experience an additional force in the orthogonal azimuthal direction, known as the Euler force. “So you have a complex force and bi-directional field that is highly tuneable,” says Reis. “And this tuneability is what we realized is very powerful.”

A rotating array

To construct their array, the researchers used clamped beams with two stable mechanical states – a little like a slap bracelet can be coiled up or flat, except these beams could either curve to the right or to the left. To individually address different beams, they ensured that each beam was unique in its width, the angle it was clamped at, and so on, all of which affect how much force is needed for a beam to ping into the opposite state. By tuning the parameters of each clamped beam and the angular acceleration of the rotating platform, they could engineer the applied force to switch (or not switch) specific beams, thereby writing data into the array purely by rotating the platform.

Doing this accurately requires a level of precision in acceleration control that surpasses what standard lab motors can achieve. However, the researchers say they were able to team up with a local company that had designed high-spec rotating platforms for its high throughput silicon chip production process. By programming platforms with five tailored clamped beams and the right rotation functions, they showed they could write the letters of the alphabet in ASCII script.

“This is a significant advance because it points toward future smart devices and robots that can be reprogrammed remotely without complex wiring or electronics, using only carefully designed motion‑based signals driven by a sole dynamic driving strategy,” explains Damiano Pasini of McGill University, Canada, who studies systems for mechanical computing but was not involved with this work directly.

Reis says he is excited about the scalability of the approach and its potential in high throughput experiments. Meanwhile, van Hecke is looking into how the idea might transfer to other systems, such as applying engineered force functions to crumpling sheets of complex glasses. “It just opens up possibilities for both studies, really fundamental studies of complex systems, but also real applications where you use this dynamic idea,” he tells Physics World.

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Scientists have developed “living plastics” that can be programmed to break themselves down when triggered. Many plastic items are made for one-time use, but the materials can remain in the environment for years. Researchers are exploring a different approach: living plastics, materials built with microbes that can be activated to break down the polymer when [...]

Ultra-precise electron beams can rearrange atoms in a 3D crystal lattice and create structures not found in nature, an international team of researchers has shown. The work could have implications for quantum simulation and atomic-scale manufacturing.

 The 1986 Nobel Prize for Physics was divided between three researchers. Half was split between Gerd Binnig and Heinrich Rohrer of IBM’s Zurich laboratory for their development of the scanning tunnelling microscope (STM). The STM’s ability not just to image but to move atoms was famously demonstrated three years later, when Don Eigler and Erhard Schweizer of IBM Almaden in California produced a picture of 35 xenon atoms precisely placed on a crystal of nickel to spell out the letters “IBM”. STMs have become widely used in surface analysis. However, they can only manipulate 2D surfaces, are painstakingly slow and require high vacuum and ultracold temperatures.

The other half of the 1986 prize went to Ernst Ruska of Germany’s Max Planck Society for his invention of the electron microscope – which can image samples with atomic resolution. Until now, however, electron microscopes had not been able to deterministically manipulate atoms because their high-energy electron beams tend to break bonds randomly within a crystal.

Now researchers in the group of Frances Ross at Massachusetts Institute of Technology led by Julian Klein, together with Kevin Roccapriore of Oak Ridge National Laboratory and others, used Oak Ridge’s ultra-precise, extremely stable, focused electron beam to penetrate around 13 nm into a crystal of the layered van der Waals material chromium sulphide bromide.

Interesting crystal structure

 “The material has a very interesting crystal structure,” says Klein; “One individual layer has a mixture of sulphur and chromium atoms, but then on both sides of this layer there are bromine atoms sticking out in both directions. And when you stack those crystals you create atom-sized gaps between the layers.”

When the electron beam is positioned within 20 pm of its target and then moved slightly in a specific direction, the electrons in the beam can nudge the chromium atoms in the line of fire out of their original positions into the target unoccupied sites. This creates lattice defects called vacancy–interstitial complexes. Computer simulations suggest that, owing to interlayer interactions, movement of the chromium atom in one layer should encourage the transformation of layers above or below. Ross says that “[the transformed layers] do form in a timed sequence, but we can’t tell in what order they’re transforming”.

 By carefully manipulating the electron beam across the surface of the crystal, the researchers can create an array of vacancy–interstitial complexes: “Julian and Kevin have a series of images at different times,” says Ross; “You can see the quality of the result just gets better and better…The beam has to be exactly on that column of atoms because otherwise some of the energy is going to go into the wrong place and disrupt the rest of the lattice.”

More robust crystals

The resulting 3D crystal is much more robust than an STM-created surface. “The defects created in the interior of the crystal are protected from the environment,” Ross explains. This allows measurements of different properties in different laboratories without needing cryogenic refrigeration or vacuum.

This could also ease the path to practical application for what is, say the researchers, an emergent many-body state. “That’s where the fun stuff comes in,” Ross says. “I’m excited because of the scalability of this that allows us to look at the interactions between the defects rather than just creating a defect itself. The stability of the microscopes that allows us to keep going and create a huge array is really exciting.” The researchers are examining various possible applications in, for example, quantum simulation and the manufacturing of matter with atomic-scale precision.

The team describes its work in Nature.

“It’s a fascinating paper,” says materials scientist and STM expert Ludwig Bartels of the University of California, Riverside. “It’s definitely above the scale of what scanning tunnelling microscopy could do…and, as they discussed in their paper, it’s probably a really interesting scale in which they can think about electronic states extending between the different defects they are making.”

He says that, while he does not believe this will ever be the way computer chips are made “it is definitely an order of magnitude above what was possible before”. Moreover, he says that the ideas used in the paper to monitor the motion of the atoms remind him of those developed 30 years ago for STM. “They are not exactly the same, but they are reminiscent, and they are just as ingenious,” he says.

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Researchers at Stanford University in the US have found a way to generate light deep within living tissues, potentially leading to new forms of gene and cancer therapies. The proof-of-concept approach uses ultrasound to trigger luminescence in nanoscale particles travelling through the bloodstream, and it has already been tested in tissue-mimicking “phantoms” and live mice. However, its developers caution that human trials are still some way off.

Light has numerous applications in medicine and biological research. It is widely used, for example, to stimulate cell growth and in photodynamic therapies for skin and eye conditions, as well as certain types of cancer.

The problem is that many potentially useful wavelengths of light are easily scattered by tissues and become attenuated over relatively short distances. This means they cannot penetrate very far into the body without help from invasive methods such as removing overlying tissue or inserting/injecting optical implants and light-emitting nanoparticles into the target area.

Sound and light

The new work by Stanford materials scientist and engineer Guosong Hong and colleagues involves nanoparticles made from a ceramic material with the chemical formula Sr₄Al₁₄O₂₅:Eu,Dy. This material is mechanoluminescent, meaning that it emits light when subjected to mechanical stresses and deformations. In Sr₄Al₁₄O₂₅:Eu,Dy, these mechanoluminescent effects can be induced by exposing the material to sound waves, which penetrate more deeply into tissue than light waves.

The Stanford researchers began by coating their nanoparticles with a biocompatible film. They then suspended the particles in a solution and injected the resulting colloid into the veins of mice. Thanks to the rodents’ vascular systems, the particles soon travelled to all parts of their bodies.

The researchers then showed they could make the nanoparticles emit blue light with a wavelength of 490 nm simultaneously in multiple locations (such as the brain, gut, hindlimb and spine) by applying sound waves to different parts of the mouse’s body. In addition, they showed they could create precise patterns of in-situ light generation throughout the three-dimensional volume of the animal, controlled over distances of 100 to 200-μm in the focal region. The ultrasound can also be used as a scanner to define where the light is generated.

A host of applications

The team picked the 490 nm wavelength because it has many applications, including neuron modulation and photodynamic cancer therapy. However, applying the same technique to different materials could produce other useful wavelengths, too. Indeed, Hong and his colleagues are exploring the possibility of using materials that emit ultraviolet light, which has antiviral and antibacterial properties.

The researchers say their approach is broadly applicable to virtually all therapeutic modalities that requires light to be delivered deep within the body, including optogenetics, phototherapy and photo-switchable gene editing. This last technique currently suffers from off-target effects, but the researchers say that by pairing light-producing nanoparticles with a light-activated gene-editing system, they may be able to use ultrasound to turn gene editing on and off in localized areas of the body.

“The overarching theme of my lab’s research is to develop new strategies to deliver and receive light throughout the body in its native, living state,” Hong tells Physics World. “In 2024, we reported on a method to render living tissue transparent using strongly absorbing dye molecules. In the present study we have taken a complementary approach: rather than modifying how light propagates through tissue, we leverage the intrinsic penetrative capability of ultrasound, together with the pervasive reach of the circulatory system, to generate light directly within deep regions of the body.”

Reporting their work in Nature Materials, the researchers are now working to integrate their approach with other light-activatable control systems, including photo-switchable Cas9 gene editing in collaboration with Michael Lin’s lab at Stanford. In parallel, they hope to develop alternative mechanoluminescent materials that will break down safely in the body. While the materials studied in this work did not seem to show adverse effects in mice, they also did not break down quickly, and the researchers say they could accumulate in organs such as the liver.

“What we’re demonstrating here is a proof-of-concept showing that you can produce light emission in a programmable manner deep within the body,” Hong says. “If we can replace the material with one that is safer to be used in humans, that will start to pave the way for clinical applications.”

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