Tag

Graphene

All articles tagged with #graphene

science8 days ago•5 min saved

Graphene's layered superconductivity defies field norms, strengthens when pushed

MIT researchers report multiple superconducting states in rhombohedral graphene layers (4- and 5-layer stacks); notably, some states are enhanced by magnetic fields, raising the transition temperature from about 55 millikelvin to ~90 millikelvin and increasing the sustainable current by 50–60%, with the outcome depending on electron density and field orientation. This challenges the usual view that magnetic fields destroy superconductivity and may have implications for quantum computing, though experiments still require ultra-cold conditions and specialized setups.

via ScienceAlert|

#graphene #magnetic-field #quantum-computing

science11 days ago•11 min saved

Field-Driven Superconductivity Emerges Across Rhombohedral Graphene Stacks

Researchers report field-enhanced and field-induced superconductivity in rhombohedral tetralayer and pentalayer graphene, with three distinct superconducting states in the pentalayer that endure in-plane fields up to 8.5 tesla (well beyond the Pauli limit). Unlike Bernal bilayer graphene, the pentalayer also shows out-of-plane field effects, and the effects emerge at relatively low gate voltages due to flatter band dispersion. Proximitized spin–orbit coupling further yields new superconductors without adding disorder, establishing a new family of magnetic-field–boosted superconductors in high-quality rhombohedral graphene and opening paths toward realizing topological states and non-Abelian quasiparticles via interface engineering.

via Nature|

#graphene #magnetic-field #rhombohedral-graphene

science2 months ago•35 min saved

Graphene Toothbrush Mystery Solved: How Graphene Oxide Kills Bacteria Without Harming Humans

Scientists reveal that graphene oxide in graphene toothbrushes targets a bacterial membrane molecule called POPG, explaining how these brushes kill bacteria while largely sparing human cells. Increasing oxygen-containing groups on graphene oxide enhances binding and antibacterial effect (around 96–99% growth suppression), while removing oxygen or adding nitrogen weakens it, highlighting surface chemistry over sheet size. Microscopy shows membrane damage and cell rupture; the approach also suppresses drug-resistant strains and aided faster wound healing in animal models, with potential uses in medical textiles and protective fabrics. Safety data come from cell and animal studies, but human trials and design optimization remain needed. More than 10 million graphene toothbrushes have already been sold, underscoring the push toward evidence-based antibacterial products.

via Earth.com|

#antibacterial #graphene #graphene-oxide

physics2 months ago•6 min saved

Dirac Fluid Emerges in Graphene, Defying a Core Law of Metals

Scientists observed a Dirac fluid in ultraclean graphene where electrons flow like a nearly frictionless liquid at the Dirac point, causing heat and charge transport to decouple and violating the Wiedemann-Franz law by over 200x, revealing universal quantum behavior and offering a new platform for exploring extreme-physics phenomena.

via ScienceDaily|

#dirac-fluid #dirac-point #graphene

science2 months ago•4 min saved

Laser-Driven Graphene Paves Fuel-Free Space Travel

A study in Advanced Science shows laser light can push graphene aerogel in microgravity, hinting at a propellant-free propulsion method for spacecraft; graphene cubes accelerated under laser beams suggest light-based thrust could cut fuel costs and enable longer, more efficient deep-space missions, though Earth gravity dampens the effect and further research is needed.

via The Daily Galaxy|

#graphene #graphene-aerogel #laser-propulsion

technology3 months ago•5 min saved

Light-Activated Graphene Coating Promises On-Demand Germ-Killing Shield

Swiss researchers developed ultra-thin graphene-oxide coatings that, when illuminated with near-infrared light, heat to about 44°C and generate reactive oxygen species to kill bacteria. In lab tests, the coating nearly eliminated a drug-resistant strain and reduced another by over 90%, and it can be activated through tissue, offering a potential implant coating solution, though clinical use is years away.

via Indian Defence Review|

#antibiotic-resistance #antimicrobial-coatings #graphene

science4 months ago•4 min saved

Graphene Excitons Stop Flow, Hinting at a New Quantum Phase

Scientists using graphene bilayers under a strong magnetic field observed excitons behaving as a superfluid at high density, but as density decreases the excitons halt and the material becomes insulating; heating restores the superfluid, a result that could point to a supersolid-like excitonic state or another unusual quantum phase, though measurements are not yet definitive.

via Indian Defence Review|

#excitons #graphene #quantum-materials

science5 months ago•9 min saved

Edison Accidentally Created Graphene in a Light-Bulb Test

Rice University researchers say Edison may have accidentally produced graphene while testing a carbon-filament light bulb, since heating carbon-based resistors above 2,000°C can yield turbostratic graphene—suggesting Edison could have encountered graphene long before its formal discovery, though he wouldn’t have known what it was.

via Hackaday|

#graphene #light-bulb #rice-university

science5 months ago•3 min saved

Did Edison Briefly Forge Graphene in 1879?

Rice University researchers suggest Thomas Edison may have accidentally produced graphene in 1879 while testing carbon‑filament light bulbs with flash Joule heating; their experiments on bamboo filaments showed transient graphene formation that would quickly convert to graphite, implying Edison could have created a modern “wonder material” long before graphene’s official isolation.

via ScienceAlert|

#carbon-filament #edison #flash-joule-heating

science5 months ago•5 min saved

Century-old bulb experiment hints Edison seeded graphene

Rice University researchers replicated Edison’s 1879 carbon‑filament bulb method and, using modern analysis, found evidence that turbostratic graphene formed in the heated carbon filament; while not definitive proof Edison himself produced graphene, the study shows how re‑examining historical experiments with current tools can reveal overlooked materials and spur new questions.

via Ars Technica|

#carbon-filament #edison #graphene

technology6 months ago•2 min saved

Graphene Supercapacitors Promise Enhanced Energy Storage for EVs and Home Devices

Scientists have developed a new form of graphene that significantly enhances supercapacitors' energy and power density, potentially enabling faster charging and higher capacity energy storage for electric vehicles, electronics, and household devices, overcoming previous limitations of space efficiency and charge speed.

via Live Science|

#energy-storage #evs #fast-charging

physics6 months ago•13 min saved

Mapping Interaction Effects on Quantum Hall Edge States

The article discusses the visualization and analysis of interaction-driven restructuring of quantum Hall edge states in graphene using advanced scanning tunneling microscopy techniques, providing insights into the topological and electronic properties of these states.

via Nature|

#edge-states #graphene #physics

technology7 months ago•2 min saved

Revolutionary Advances in Fast-Charging and Energy Storage Technologies

Researchers at Monash University have developed a new graphene-based material called multiscale reduced graphene oxide (M-rGO) that significantly enhances supercapacitors, enabling them to store energy comparable to batteries while offering rapid charging and high power output, with potential for commercial applications in electric vehicles and electronics.

via ScienceDaily|

#energy-storage #fast-charging #graphene

science8 months ago•4 min saved

Breakthrough in Magic-Angle Graphene Superconductivity Sparks Hope for High-Temperature Applications

MIT researchers have discovered a new type of superconductivity in 'magic-angle' twisted tri-layer graphene, which could be a significant step toward developing room-temperature superconductors, potentially revolutionizing energy transmission and electronic devices.

via The Debrief|

#graphene #magic-angle #mit

science8 months ago•7 min saved

MIT Researchers Confirm Unconventional Superconductivity in Magic-Angle Graphene

MIT physicists have provided the most direct evidence yet of unconventional superconductivity in magic-angle twisted trilayer graphene (MATTG), revealing a distinct superconducting gap that suggests a different pairing mechanism than traditional superconductors, potentially paving the way for room-temperature superconductivity and advanced quantum technologies.

via MIT News|

#graphene #mit #quantum-materials