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Shape memory polymers with nanotips help solve micro-LED chip transfer problem

A research team at Pohang University of Science and Technology (POSTECH), has developed a novel dry adhesive technology that allows everything from microscale electronic components to common household materials to be easily attached and detached.

The study was recently published in the journal Nature Communications, and the team was led by Professor Seok Kim in collaboration with Professor Kihun Kim (POSTECH), Professor Namjoong Kim (Gachon University), Professor Haneol Lee (Chonbuk National University), and Dr. Chang-Hee Son (University of Connecticut, U.S.).

Micro-LEDs, a next-generation display technology, offer significant advantages such as higher brightness, longer lifespan, and the ability to enable flexible and transparent displays. However, transferring micro-LED chips—thinner than a strand of hair—onto target substrates with high precision and minimal residue has been a persistent challenge. Conventional methods relying on liquid adhesives or specialized films often result in overly complex processes, poor alignment accuracy, and residual contamination.

Researchers uncover cause of uranium groundwater contamination

A new study published in the journal Environmental Science & Technology and led by researchers at Columbia University Mailman School of Public Health identifies the hidden geological mechanisms behind widespread uranium contamination in Eastern Karnataka, India, where 78% of tested groundwater exceeds safe drinking limits for uranium, and some groundwater uranium contamination reaches levels 75 times the U.S. EPA limit. Uranium exposure can affect the kidneys, bones, and the liver, yet contamination often goes undetected.

Floating Robotics: Advanced Greenhouse Automation Solutions

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Discover Floating Robotics’ cutting-edge robotic systems designed to automate greenhouse tasks like harvesting and de-leafing, enhancing efficiency and sustainability in modern agriculture.

New study uncovers surprising physics of ‘marine snow’

The deep ocean can often look like a real-life snow globe. As organic particles from plant and animal matter on the surface sink downward, they combine with dust and other material to create “marine snow,” a beautiful display of ocean weather that plays a crucial role in cycling carbon and other nutrients through the world’s oceans.

Now, researchers from Brown University and the University of North Carolina at Chapel Hill have found surprising new insights into how particles sink in stratified fluids like oceans, where the density of the fluid changes with depth. In a study published in Proceedings of the National Academy of Sciences, they show that the speed at which particles sink is determined not only by resistive drag forces from the fluid, but by the rate at which they can absorb salt relative to their volume.

“It basically means that can sink faster than bigger ones,” said Robert Hunt, a postdoctoral researcher in Brown’s School of Engineering who led the work. “That’s exactly the opposite of what you’d expect in a fluid that has uniform density.”

Texas company makes $60B semiconductor investment in Texas, Utah

The $60 billion investment involves building or expanding seven chip-making facilities that Texas Instruments has in Sherman, Texas; Richardson, Texas; and Lehi, Utah. Notably, the North Texas city of Sherman will get two new facilities as part of Texas Instruments’ vision to manufacture hundreds of millions of chips daily.

The move comes a few years after the Biden Administration supported companies such as Texas Instruments with funding through the Chips and Science Act. Earlier this month, U.S. Secretary of Commerce Howard Lutnick said the Commerce Department is renegotiating some of its contracts.

And as President Donald Trump has been pushing for more U.S.-based manufacturing, Lutnick celebrated the Wednesday announcement from Texas Instruments.

Successful synthesis of neutral N₆ opens door for future energy storage

Nitrogen finally joins the elite tier of elements like carbon that can form neutral allotropes—different structural forms of a single chemical element. Researchers from Justus Liebig University, Giessen, Germany, have synthesized neutral hexanitrogen (N6)—the first neutral allotrope of nitrogen since the discovery of naturally occurring dinitrogen (N2) in the 18th century that is cryogenically stable and can be prepared at room temperature.

This new study, published in Nature, synthesized hexanitrogen (N6) via gas-phase reaction, with the main ingredients being chlorine (Cl2) or bromine (Br2) and an extremely reactive and explosive solid silver azide (AgN3), under reduced pressure.

The researchers spread AgN3 on the , and a gaseous halogen (Cl2 or Br2) was passed through the solid under reduced pressure at room temperature. The reaction triggered by the process produced N6 alongside byproducts chloronitrene (ClN) and hydrazoic acid (HN3).

Geographical Expansion of Avian Metapneumovirus Subtype B: First Detection and Molecular Characterization of Avian Metapneumovirus Subtype B in US Poultry

Avian metapneumovirus (aMPV), classified within the Pneumoviridae family, wreaks havoc on poultry health. It typically causes upper respiratory tract and reproductive tract infections, mainly in turkeys, chickens, and ducks. Four subtypes of AMPV (A, B, C, D) and two unclassified subtypes have been identified, of which subtypes A and B are widely distributed across the world. In January 2024, an outbreak of severe respiratory disease occurred on turkey and chicken farms across different states in the US. Metagenomics sequencing of selected tissue and swab samples confirmed the presence of aMPV subtype B. Subsequently, all samples were screened using an aMPV subtype A and B multiplex real-time RT-PCR kit. Of the 221 farms, 124 (56%) were found to be positive for aMPV-B. All samples were negative for subtype A.

Heterostructure-Engineered Semiconductor Quantum Dots toward Photocatalyzed-Redox Cooperative Coupling Reaction

Semiconductor quantum dots have been emerging as one of the most ideal materials for artificial photosynthesis. Here, we report the assembled ZnS-CdS hybrid heterostructure for efficient coupling cooperative redox catalysis toward the oxidation of 1-phenylethanol to acetophenone/2,3-diphenyl-2,3-butanediol (pinacol) integrated with the reduction of protons to H2. The strong interaction and typical type-I band-position alignment between CdS quantum dots and ZnS quantum dots result in efficient separation and transfer of electron-hole pairs, thus distinctly enhancing the coupled photocatalyzed-redox activity and stability. The optimal ZnS-CdS hybrid also delivers a superior performance for various aromatic alcohol coupling photoredox reaction, and the ratio of electrons and holes consumed in such redox reaction is close to 1.0, indicating a high atom economy of cooperative coupling catalysis. In addition, by recycling the scattered light in the near field of a SiO2 sphere, the SiO2-supported ZnS-CdS (denoted as ZnS-CdS/SiO2) catalyst can further achieve a 3.5-fold higher yield than ZnS-CdS hybrid. Mechanistic research clarifies that the oxidation of 1-phenylethanol proceeds through the pivotal radical intermediates of • C(CH3)(OH)Ph. This work is expected to promote the rational design of semiconductor quantum dots-based heterostructured catalysts for coupling photoredox catalysis in organic synthesis and clean fuels production.

Copyright © 2023 Lin-Xing Zhang et al.

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Chronic traumatic encephalopathy rare among individuals with isolated brain injuries

Chronic traumatic encephalopathy (CTE) is more common in people who experience extensive repetitive head impacts, and infrequent among individuals with isolated brain injuries or less extensive impacts, researchers from the Brain Injury Research Center of Mount Sinai have found.

The study, published in the Journal of Neuropathology & Experimental Neurology, adds to knowledge of CTE, which has received extensive media attention amidst limited research in representative samples.

CTE is characterized by a neurodegenerative pathology involving abnormal accumulations of tau protein in the brain associated with head trauma, primarily identified in deceased people who sustained extensive exposure to repetitive head impacts while playing contact sports—especially American-style football. CTE has been reported more rarely in individuals who sustained repetitive head impacts through head-banging, military service, or intimate partner violence.

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