Batteries from rust? Carbon spheres filled with iron oxide deliver high storage capacity

Batteries from rust? Carbon spheres filled with iron oxide deliver high storage capacity
Credit: Chemistry of Materials (2026). DOI: 10.1021/acs.chemmater.5c02442

Conventional lithium-ion batteries contain problematic substances such as nickel and cobalt, and the solvents used to coat the electrode materials are also toxic. Materials scientists at Saarland University are therefore working to develop environmentally friendly alternatives. By introducing finely dispersed iron oxide into tiny, highly porous, hollow carbon spheres developed by Professor Michael Elsaesser at the University of Salzburg, the Saarbrücken team has achieved some very promising results: higher storage capacities using materials that are both readily available and environmentally far less problematic. These results have now been published in Chemistry of Materials.

Anyone who has ever been to Sa...

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Dark matter, not a black hole, could power Milky Way’s heart

'Dark matter, not a black hole, could power Milky Way's heart'
Artistic representation of the Milky Way, where the innermost stars move at near relativistic speeds (defined as velocities that constitute a significant fraction of the speed of light, typically considered to be 10% or more) around a dense core of dark matter, with no black hole at the centre. At greater distances, the halo part of the same invisible dark matter distribution continues to shape the motions of stars in the outskirts of our galaxy, tracing the characteristic rotation curve. Credit: Valentina Crespi et al. License type Attribution (CC BY 4.0)

Our Milky Way galaxy may not have a supermassive black hole at its center but rather an enormous clump of mysterious dark matter exerting the same gravitational influence, astronomers say...

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Self-regulating living implant could end daily insulin injections

Self-regulating living implant could end daily insulin injections
Crystal Capsules. Credit: Technion – Israel Institute of Technology

A pioneering study marks a major step toward eliminating the need for daily insulin injections for people with diabetes. The study was led by Assistant Professor Shady Farah of the Faculty of Chemical Engineering at the Technion—Israel Institute of Technology, in co-correspondence with MIT, and in collaboration with Harvard University, Johns Hopkins University, and the University of Massachusetts. The findings are published in the journal Science Translational Medicine.

The research introduces a living, cell-based implant that can function as an autonomous artificial pancreas, essentially a living drug that is long-term, thanks to a novel crystalline shield-protecting technology...

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Unhackable metasurface holograms: Security technology can lock information with light color and distance

Schematic of secure holography using a reconfigurable stacked metasurface based on a modular diffractive deep neural network. Each metasurface layer independently reconstructs distinct wavelength-encoded holograms (e.g., ID and QR). When two layers are aligned at a specific interlayer spacing, the system is trained to reveal an encrypted hologram (PW). Because decryption is enabled by the combined choice of wavelength and interlayer spacing as physical decoding keys, the information can be retrieved without electronic computation. This single platform integrates standalone (layer-wise), combinational (cipher), and multi-wavelength functionalities, enabling a photonic security platform for optical encryption and data storage. Credit: POSTECH

A research team led by Professor Junsuk Rho a...

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