Archive for the ‘materials’ category: Page 5

Sep 29, 2020

Scientists Create Enzyme That Devours Plastic at Incredible Speed

Posted by in category: materials

All Hands

The new enzyme can make its way through plastic six times faster than the previous plastic-devouring enzyme developed by members of the same team, according to research published Monday in the journal PNAS.

“We were actually quite surprised it worked so well,” McGeehan told CNN, though he added that the enzyme is “still way too slow” to be helpful at any meaningful scale.

Sep 26, 2020

Scientists Create Plastic That Can Be Recycled Forever

Posted by in categories: materials, sustainability

Researchers at Berkeley Lab in California have developed a new material that can close the loop on recycling plastics, keeping it out of the ocean and landfills.

Sep 22, 2020

Levitating Superconductor on a Möbius strip

Posted by in category: materials

Andy takes a closer look at one of his favourite demos from the 2012 Christmas Lectures, bringing together a levitating superconductor and a bewildering Möbius strip made from over 2,000 magnets.

We’d love it if you helped us translate this video:

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Sep 22, 2020

How One Irreverent Physicist Went From Levitating Frogs to Winning the Nobel Prize

Posted by in categories: materials, particle physics

The following is adapted from Lewis’ The Rise: Creativity, the Gift of Failure, and the Search for Mastery, published by Simon & Schuster.

“It says, ‘No entrance,’ but you just enter,” physicist Andre Geim told me about the graphite mines in the mountains where he often hikes. His comment embodied the insouciance behind his Nobel Prize–winning physics experiment and his habit of experimenting deliberately outside of his area of expertise.

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Sep 22, 2020

To Study Zero Gravity, Levitate Fruit Flies

Posted by in categories: biotech/medical, materials

Using superconductors, scientists can levitate small creatures such as fruit flies for long periods of time.

Scientists who want to study the effects of weightlessness have always had precious few options. There’s the “vomit comet,” NASA’s Weightless Wonder plane that creates a few seconds of weightlessness during parabolic flights. Or they could convince the space agency to actually launch their experiments into the great beyond.

But there might be an easier and cheaper way: levitation.

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Sep 21, 2020

Planet-forming disc is torn apart in triple star system

Posted by in categories: materials, space

Disc is left with warped and tilted rings.

The young triple star system GW Orionis appears to be surrounded by a ring of gas and dust that has torn away and become misaligned with the rest of the system’s circumstellar disc. That is the conclusion of an international team of astronomers led by Stefan Kraus at the University of Exeter – who combined observations with numerical simulations to identify disc structures that have been confined to theory until now.

Astronomers believe that most stars are born with one or more companions, which interact in complex ways with the disc of planet-forming gas and dust surrounding the stellar system. If this disc is misaligned with the orbital planes of the host stars, previous simulations have predicted that it will warp and tear under their gravitational torque, forming distinct rings in separate planes from the rest of the disc. So far, however, astronomers have yet to identify this tearing in their observations of misaligned discs.

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Sep 16, 2020

Boundaries no barrier for thermoelectricity

Posted by in categories: materials, nanotechnology

Though the Summer Olympics were postponed, there’s at least one place to see agile hurdlers go for the gold.

You just need a way to view these electron games.

Using a novel optical detection system, researchers at Rice University found that electricity generated by temperature differences doesn’t appear to be affected measurably by placed in its way in nanoscale gold wires, while strain and other defects in the material can change this “thermoelectric” response.

Sep 14, 2020

The Hall effect links superconductivity and quantum criticality in a strange metal

Posted by in categories: materials, quantum physics

Over the past few decades, researchers have identified a number of superconducting materials with atypical properties, known as unconventional superconductors. Many of these superconductors share the same anomalous charge transport properties and are thus collectively characterized as “strange metals.”

Researchers at the University of California, Berkeley (UC Berkeley) and Los Alamos National Laboratory have been investigating the anomalous transport properties of strange metals, along with several other teams worldwide. In a recent paper published in Nature Physics, they showed that in one of these materials, BaFe2(As1− xPx)2, superconductivity and quantum criticality are linked by what is known as the Hall effect.

For decades, physicists have been unable to fully understand T-linear resistivity, a signature of strange metals that has often been observed in many unconventional superconductors. In 2016, the team at UC Berkeley and Los Alamos National Lab observed an unusual scaling relationship between the and temperature in superconductor BaFe2(As1− xPx)2.

Sep 13, 2020

New Graphene Face Masks Offer Very High Anti-bacterial Efficiency, Deactivation of Coronaviruses

Posted by in categories: biotech/medical, materials

Anti-bacterial efficiency close to 100% under 10-min sunlight and promising results in deactivation of coronaviruses.

Face masks have become an important tool in fighting against the COVID-19 pandemic. However, improper use or disposal of masks may lead to “secondary transmission.” A research team from City University of Hong Kong (CityU) has successfully produced graphene masks with an anti-bacterial efficiency of 80%, which can be enhanced to almost 100% with exposure to sunlight for around 10 minutes. Initial tests also showed very promising results in the deactivation of two species of coronaviruses. The graphene masks are easily produced at low cost, and can help to resolve the problems of sourcing raw materials and disposing of non-biodegradable masks.

The research is conducted by Dr. Ye Ruquan, Assistant Professor from CityU’s Department of Chemistry, in collaboration with other researchers. The findings were published in the scientific journal ACS Nano, titled “Self-Reporting and Photothermally Enhanced Rapid Bacterial Killing on a Laser-Induced Graphene Mask.”

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Sep 12, 2020

NASA is looking for private companies to help mine the moon

Posted by in categories: materials, space

NASA has announced it is looking for private companies to go to the moon and collect dust and rocks from the surface and bring them back to Earth.

The American space agency would then buy the moon samples in amounts between 50 to 500 grams for between $15,000 to $25,000.

The NASA administrator, Jim Bridenstine, announced on Thursday that the moon material collection would become part of a technology development program that would help astronauts “live off the land” for crewed missions in the future to the moon or elsewhere.

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