An official website of the United States government.
A team of researchers from the United States and China has developed a new kind of wearable health sensor that uses micro- and nanotechnology and would deliver real-time medical data to people with eye or mouth diseases. The sensors would be placed near the tear duct or mouth to collect samples, which would then produce data viewable on a user's smartphone or sent to their doctor.
When two sheets of graphene are stacked atop each other at just the right angle, the layered structure morphs into an unconventional superconductor. The MIT scientists who made that discovery now report observing superconductivity in a sandwich of three graphene sheets, the middle layer of which is twisted at a new angle with respect to the outer layers. This new trilayer configuration exhibits superconductivity that is more robust than its bilayer counterpart.
When two sheets of graphene are stacked atop each other at just the right angle, the layered structure morphs into an unconventional superconductor. The MIT scientists who made that discovery now report observing superconductivity in a sandwich of three graphene sheets, the middle layer of which is twisted at a new angle with respect to the outer layers. This new trilayer configuration exhibits superconductivity that is more robust than its bilayer counterpart.
Researchers with the Kansas City Veterans Affairs Medical Center and North Dakota State University have designed a new way to deliver pancreatic cancer drugs that could make fighting the disease easier. They designed a nanoparticle delivery system that stops the drugs from breaking down and releases them specifically to cancer cells in the pancreas and not to other areas of the body.
Researchers with the Kansas City Veterans Affairs Medical Center and North Dakota State University have designed a new way to deliver pancreatic cancer drugs that could make fighting the disease easier. They designed a nanoparticle delivery system that stops the drugs from breaking down and releases them specifically to cancer cells in the pancreas and not to other areas of the body.
For more than 15 years, researchers at The University of Texas at Dallas and their collaborators in the United States, Australia, South Korea, and China have made artificial muscles by twisting and coiling carbon nanotube or polymer yarns. When thermally powered, these muscles actuate by contracting their length when heated and returning to their initial length when cooled. Such thermally driven artificial muscles, however, have limitations. The researchers have now created powerful, unipolar electrochemical yarn muscles that contract more when driven faster, thereby solving important problems that have limited the applications for these muscles.
For more than 15 years, researchers at The University of Texas at Dallas and their collaborators in the United States, Australia, South Korea, and China have made artificial muscles by twisting and coiling carbon nanotube or polymer yarns. When thermally powered, these muscles actuate by contracting their length when heated and returning to their initial length when cooled. Such thermally driven artificial muscles, however, have limitations. The researchers have now created powerful, unipolar electrochemical yarn muscles that contract more when driven faster, thereby solving important problems that have limited the applications for these muscles.
Researchers at Harvard University have developed a two-millimeter achromatic metalens that can focus red, blue, and green colors without aberrations. Like previous metalenses, this lens uses arrays of titanium dioxide nanofins to focus wavelengths of light and eliminate chromatic aberration. In a virtual or augmented reality platform, the metalens would sit directly in front of the eye, and the display would sit within the focal plane of the metalens.
Researchers at Harvard University have developed a two-millimeter achromatic metalens that can focus red, blue, and green colors without aberrations. Like previous metalenses, this lens uses arrays of titanium dioxide nanofins to focus wavelengths of light and eliminate chromatic aberration. In a virtual or augmented reality platform, the metalens would sit directly in front of the eye, and the display would sit within the focal plane of the metalens.
Bulk hexagonal boron nitride is cheap and easy to obtain, but exfoliating it into atomically thin nanosheets has been a challenge. Now, chemists at Rice University have found a way to get the maximum amount of quality 2D hexagonal boron nitride nanosheets (from its natural bulk form) by processing it with surfactant and water. The surfactant surrounds and stabilizes the nanosheets, preserving their properties.
