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Archive for the ‘materials’ category

Jan 31, 2024

MIT physicists turn pencil lead into “gold”

Posted by in categories: materials, physics

MIT physicists have metaphorically turned graphite, or pencil lead, into gold by isolating five ultrathin flakes stacked in a specific order. The resulting material can then be tuned to exhibit three important properties never before seen in natural graphite.

“It is kind of like one-stop shopping,” says Long Ju, an assistant professor in the Department of Physics and leader of the work, which is reported in the Oct. 5 issue of Nature Nanotechnology. “Nature has plenty of surprises. In this case, we never realized that all of these interesting things are embedded in graphite.”

Further, he says, “It is very rare material to find materials that can host this many properties.”

Jan 31, 2024

In a quantum coup, US finds first-ever 3D material that ‘locks’ electrons

Posted by in categories: materials, quantum physics

It was 1951 that a Japanese researcher found a two dimensional lattice structure that could lock electrons. It has taken over seven decades to find a 3D structure.

Jan 30, 2024

Researchers showcase new breakthroughs for unlocking the potential of plasmonics

Posted by in categories: materials, nanotechnology

Plasmonics are special optical phenomena that are understood as interactions between light and matter and possess diverse shapes, material compositions, and symmetry-related behavior. The design of such plasmonic structures at the nanoscale level can pave the way for optical materials that respond to the orientation of light (polarization), which is not easily achievable in bulk size and existing materials.

In this regard, “shadow growth” is a technique that utilizes vacuum deposition to produce nanoparticles from a wide range of 2D and 3D shapes at nanoscale. Recent research progress in controlling this shadow effect has broadened the possibilities for the creation of different nanostructures.

Now, in twin studies led by Assistant Professor Hyeon-Ho Jeong from the Gwangju Institute of Science and Technology (GIST), Republic of Korea, researchers have comprehensively shed light on the recent advances in shadow growth techniques for hybrid plasmonic nanomaterials, including clock-inspired designs containing magnesium (Mg).

Jan 30, 2024

Researchers slow down light in metasurfaces with record low loss

Posted by in categories: materials, nanotechnology

The speed of light can be intentionally reduced in various media. Various techniques have been developed over the years to slow down light, including electromagnetically induced transparency (EIT), Bose-Einstein condensate (BEC), photonic crystals, and stimulated Brillouin scattering (SBS).

Notably, researchers from Harvard, led by Lene Vestergaard Hau, reduced light speed to 17 m/s in an ultracold atomic gas using EIT, which sparked the interest in exploring EIT analogs in metasurfaces, a transformative platform in optics and photonics.

Despite the benefits, slow-light structures face a significant challenge: Loss, which limits storage time and interaction length. This issue is particularly severe for analogs of EIT due to scattering loss of nanoparticles and sometimes absorption loss of materials.

Jan 29, 2024

New biocompatible nanotweezers enhance control over diverse nanoparticles with versatility and precision

Posted by in categories: materials, nanotechnology

Highly adaptable optothermal nanotweezers leverage thermophoresis and thermo-osmosis to trap nanoparticles as small as 3.3 nm across materials without requiring surface modifications.

Jan 29, 2024

Peer Reviewed Paper Shows Room Temperature and Room Pressure Superconductor Evidence in Linear Parallel Wrinkled Graphite

Posted by in categories: materials, quantum physics

Advanced Quantum Technologies is a peer reviewed journal that has published a paper – Global Room-Temperature Superconductivity in Graphite. The researchers are from Brazil, Italy and Switzerland.

They use the scotch-taped cleaved pyrolytic graphite carrying the wrinkles that resulted from this cleaving to which they also refer as to line defects. They detected experimental evidence for the global zero-resistance state. The experimental data clearly demonstrated that the array of nearly parallel linear defects that form due to the cleaving of the highly oriented pyrolytic graphite hosts one-dimensional superconductivity.

One-Dimensional room temperture and room pressure superconductivity is what part of the theory and claims proposed for LK99 and sulfurized LK99 and PCPOSOS.

Jan 27, 2024

Scientists turn glass into a ‘transparent’ semiconductor with laser

Posted by in categories: innovation, materials

The team was thrilled with this discovery and saw the potential for creating durable patterns on the glass surface that could produce electricity when illuminated. This is a significant breakthrough because the technique does not require any additional materials, and all that is needed is tellurite glass and a femtosecond laser to create an active photoconductive material.

“Tellurium being semiconducting, based on this finding we wondered if it would be possible to write durable patterns on the tellurite glass surface that could reliably induce electricity when exposed to light, and the answer is yes,” explains Yves Bellouard who runs EPFL’s Galatea Laboratory.

Jan 27, 2024

Snails’ Teeth Beats Spider Silk As Nature’s Strongest Material

Posted by in category: materials

The discovery makes sense: Mollusks use these teeth to excavate rocks while they feed.

Jan 27, 2024

Shadows and Light: Discovering the Hidden Depths of Quantum Materials

Posted by in categories: materials, quantum physics

Scientists used a laser-based technique to reveal hidden quantum properties of the material Ta2NiSe5, potentially advancing the development of quantum light sources.

Certain materials have desirable properties that are hidden, and just as you would use a flashlight to see in the dark, scientists can use light to uncover these properties.

Researchers at the University of California San Diego have used an advanced optical technique to learn more about a quantum material called Ta2NiSe5 (TNS). Their work was published in the journal Nature Materials.

Jan 25, 2024

Coal: Don’t Burn It, Compute With It

Posted by in categories: energy, materials

A certain fossil fuel works well as a 2D insulating films that could help launch a new era of semiconductors made with 2D materials.

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