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Category: nanotechnology – Page 10

Sulfur-capped carbon nanobelts promise novel applications

RIKEN chemists have hit upon a fast and easy way to combine so-called nanobelts of carbon with sulfur-containing functional groups. The work is published in the journal Nature Communications.

This new material has intriguing properties that make it promising for use in novel optoelectronic devices.

Ever since their discovery in 1991, carbon nanotubes—tiny hollow cylinders made entirely from carbon atoms—have been attracting a lot of interest, being used in applications ranging from electronics to medicine.

Biodegradable microplastics in mice gut trigger metabolic reprogramming, shedding light on safety concerns

Microplastic pollution is a severe ecological and environmental issue and is also one of the important risk factors affecting human health. Polylactic acid (PLA), a medical biodegradable material approved by the FDA, is an important material to replace petroleum-based plastics.

Although PLA has achieved large-scale application in , its brittle characteristics make it more likely to generate microplastic particles. These particles can efficiently invade the gut through the food chain and trigger unknown biotransformation processes at the microbiota–host interface. Therefore, elucidating precisely the transformation map of PLA microplastics within the living body is crucial for assessing their safety.

In a study published in the Proceedings of the National Academy of Sciences, a research team led by Prof. Chen Chunying from the National Center for Nanoscience and Technology (NCNST) of the Chinese Academy of Sciences has revealed the complete biological fate of PLA microplastics (PLA-MPs) in the gut of mice, particularly focusing on their microbial fermentation into endogenous metabolites and their involvement in the .

Revolution in friction: A way to make super-smooth materials

Scientists from the Faculty of Physics and Applied Informatics at the University of Lodz have published an article on friction in the journal Small. Their research on “bismuth islands” moving on the surface of graphite confirmed the existence of a totally new form of so-called superlubricity—a friction-free contact between two solid bodies.

This discovery could revolutionize the way we design nanoscale machines, and even vehicles, in the future. By understanding these processes, we can create devices that can operate much more efficiently, saving on energy and resources.

Scientists led by Dr. Hab. Paweł Kowalczyk, associate professor at the University of Lodz, have discovered a new phenomenon related to the disappearance of friction—superlubricity. This special phenomenon was observed at the contact of two solid materials, bismuth and graphite.

Carbon nanotubes made from waste carbon dioxide produce surprising plasma when microwaved

Plasma is the fourth state of matter and is often referred to as an electrified gas. A plasma will form when a neutral gas is heated to the point where electrons are freed from their atoms. These free electrons allow current to flow through the gas so that it reacts to both electric and magnetic fields. Plasmas have many applications across materials science, medicine and manufacturing, however, specialised equipment is usually needed to maintain the plasma state.

The mostly widely used method for synthesising carbon nanotubes and other graphene nanocarbons is chemical vapour deposition, which requires substantial energy and material, and produces large quantities of carbon dioxide emissions. In 2009, Licht showed that a molten carbonate electrolysis method could be a more sustainable alternative. It involved directly splitting carbon dioxide into oxygen gas and carbon in the form of graphene nanocarbons.2

Now, Licht’s group has employed molten carbonate electrolysis to convert carbon dioxide into carbon nanotubes. Microwaving these carbon nanotubes in a regular microwave oven ignites a striking yellow-white plasma within seconds and reaches temperatures exceeding 800°C.

Scientists create a ‘brilliantly luminous’ nanoscale chemical tool

University of Missouri researchers developed the tiny clay-based materials that can be customized for a range of analytical, commercial and medical applications.

Imagine tiny LEGO pieces that automatically snap together to form a strong, flat sheet. Then, scientists add special chemical “hooks” to these sheets to attach glowing molecules called fluorophores.

Associate Professor Gary Baker, Piyuni Ishtaweera, Ph.D., and their team have created these tiny, clay-based materials—called fluorescent polyionic nanoclays. They can be customized for many uses, including advancing energy and sensor technology, improving medical treatments and protecting the environment.

New self-healing polymer possesses a quality never before seen at any scale

What if there were a fabric that, like Superman, could take a bullet and self-heal? Such a super-dynamic, action-powered polymer might actually help protect real-life flyers in space.

Material scientists at Texas A&M University have developed just such a polymer with a unique self-healing property never before seen at any scale. When struck by a projectile, this material stretches so much that when the projectile manages to pass through, it takes only a small amount of the polymer with it. As a result, the hole left behind is much smaller than the projectile itself.

However, for now, this effect has only been observed under and at the nanoscale.

Precision-engineered surface can enhance silicon solar cell performance

Converting sunlight into electricity is the task of photovoltaic solar cells, but nearly half the light that reaches a flat silicon solar cell surface is lost to reflection. While traditional antireflective coatings help, they only work within a narrow range of light frequency and incidence angles. A new study may have overcome this limit.

As reported in Advanced Photonics Nexus, researchers have proposed a new type of antireflective coating using a single, ultrathin layer of polycrystalline silicon nanostructures (a.k.a. a metasurface). Achieving minimal reflection across certain wavelengths and angles, the metasurface was reportedly developed by combining forward and inverse design techniques, enhanced by (AI).

The result is a coating that sharply reduces reflection across a wide range of wavelengths and angles, setting a new benchmark for performance with minimal material complexity.

Hemispherical mirror technique results in quantum noise reduction

Researchers at Swansea University have discovered a way to use mirrors to dramatically reduce the quantum noise that disturbs tiny particles—a breakthrough that might seem magical but is rooted in quantum physics.

When scientists measure extremely small objects, such as nanoparticles, they face a difficult challenge: simply observing these particles disturbs them. This happens because photons, particles of light, used for measurement “kick” the they hit, an effect known as “backaction.”

In a new study published in Physical Review Research, a team from the university’s Physics Department has revealed a remarkable connection, that this relationship works both ways.

Iron-fortified lumber could be a greener alternative to steel beams

Although lumber does show promise as a renewable alternative to structural materials such as steel and concrete, it still tends to be a bit weaker than those substances. Scientists have now set about addressing that shortcoming, by strengthening wood with added iron.

Led by Asst. Prof. Vivian Merk, a team of researchers at Florida Atlantic University (FAU) started out with cubes of untreated red oak hardwood. Red oak – along with hardwoods like maple, cherry and walnut – is an example of what’s known as ring-porous wood. In a nutshell, this means that it utilizes large ring-shaped internal vessels to draw water up from the tree’s roots to its leaves.

The scientists proceeded to mix ferric nitrate with potassium hydroxide, creating a hard iron oxide mineral called nanocrystalline ferrihydrite, which occurs naturally in soil and water. Utilizing a vacuum impregnation process, nanoparticles of that ferrihydrite were drawn into the wood and deposited inside of its individual cell walls.