Single-walled carbon nanotubes are loaded with desirable properties. In particular, the ability to conduct electricity at high rates of speed makes them attractive for use as nanoscale transistors. But this and other properties are largely dependent on their structure, and their structure is determined when the nanotube is just beginning to form.
New research from North Carolina State Univ. and the Univ. of Minnesota shows the majority of consumers will accept the presence of nanotechnology or genetic modification (GM) technology in foods—but only if the technology enhances the nutrition or improves the safety of the food. The researchers conducted a nationally representative survey of 1,117 U.S. consumers.
Metamaterials, precisely designed composite materials that have properties not found in natural ones, could be used to make light-bending invisibility cloaks, flat lenses and other otherwise impossible devices. Figuring out the necessary composition and internal structure to create these unusual effects is a challenge but new research from the Univ. of Pennsylvania presents a way of simplifying things.
A pair of researchers from the Univ. of California, Los Angeles Henry Samueli School of Engineering and Applied Science has created the first surface texture that can repel all liquids, no matter what material the surface is made of. Because its design relies only on the physical attributes of the texture, the texture could have industrial or biomedical applications.
Stanford Univ. engineers have invented a revolutionary coating material that can help cool buildings, even on sunny days, by radiating heat away from the buildings and sending it directly into space. The heart of the invention is an ultra-thin, multi-layered material that deals with light, both invisible and visible, in a new way.
As solar panels become less expensive and capable of generating more power, solar energy is becoming a more commercially viable alternative source of electricity. However, the photovoltaic cells now used to turn sunlight into electricity can only absorb and use a small fraction of that light, and that means a significant amount of solar energy goes untapped. A new technology epresents a first step toward harnessing that lost energy.
New catalysts designed and investigated by Tufts Univ. have the potential to greatly reduce processing costs in future fuels, such as hydrogen. The catalysts are composed of a unique structure of single gold atoms bound by oxygen to several sodium or potassium atoms and supported on non-reactive silica materials.
Graphene’s great strength appears to be determined by how well it stretches before it breaks, according to Rice Univ. scientists who tested the material’s properties by peppering it with microbullets. The 2-D carbon honeycomb discovered a decade ago is thought to be much stronger than steel. But the scientists didn’t need even a pound of graphene to prove the material is on average 10 times better than steel at dissipating kinetic energy.
Graphene, impermeable to all gases and liquids, can easily allow protons to pass through it, Univ. of Manchester researchers have found. Published in Nature, the discovery could revolutionize fuel cells and other hydrogen-based technologies as they require a barrier that only allow protons to pass through.
In metals such as copper or aluminum, so-called conduction electrons are able to move around freely, in the same way as particles in a gas or a liquid. If, however, impurities are implanted into the metal's crystal lattice, the electrons cluster together in a uniform pattern around the point of interference, resembling the ripples that occur when a stone is thrown into a pool of water.
Researchers at KU Leuven’s Centre for Surface Chemistry and Catalysis have successfully converted sawdust into building blocks for gasoline. Using a new chemical process, they were able to convert the cellulose in sawdust into hydrocarbon chains. These hydrocarbons can be used as an additive in gasoline, or as a component in plastics.
The spaghetti-like internal structure of most plastics makes it hard for them to cast away heat, but a Univ. of Michigan research team has made a plastic blend that does so 10 times better than its conventional counterparts. Plastics are inexpensive, lightweight and flexible, but because they restrict the flow of heat, their use is limited in technologies like computers, smartphones, cars or airplanes.
Physicists at the Univ. of Kansas have fabricated an innovative substance from two different atomic sheets that interlock much like Lego toy bricks. The researchers said the new material, made of a layer of graphene and a layer of tungsten disulfide, could be used in solar cells and flexible electronics.
A tensile strength is a common materials test. Typical, a sample is subjected to controlled tension until it fails, providing valuable data for fundamental materials development or quality control. The key data acquired include maximum elongation, reduction in cross-section and ultimate tensile strength. Derived from these are a host of properties: Young’s modulus, yield strength, Poisson’s ratio and strain-hardening characteristics.
Nanoporous metals have a wide range of applications because of their superior qualities. They posses a high surface area for better electron transfer, which can lead to the improved performance of an electrode in an electric double capacitor or battery. Nanoporous metals offer an increased number of available sites for the adsorption of analytes, a highly desirable feature for sensors.
If you spot someone stuck to the sheer glass side of a building on the Stanford Univ. campus, it's probably Elliot Hawkes testing his dissertation work. Hawkes, a mechanical engineering graduate student, works with a team of engineers who are developing controllable, reusable adhesive materials that, like the gecko toes that inspire the work, can form a strong bond with smooth surfaces but also release with minimal effort.
The improvements in random access memory (RAM) that have driven many advances of the digital age owe much to the innovative application of physics and chemistry at the atomic scale. Accordingly, a team led by Univ. of Nebraska-Lincoln researchers has employed a Nobel Prize-winning material and common household chemical to enhance the properties of a component primed for the next generation of high-speed, high-capacity RAM.
Conventional treatment seeks to eradicate cancer cells by drugs and therapy delivered from outside the cell, which may also affect (and potentially harm) nearby normal cells. In contrast to conventional cancer therapy, a Univ. of Cincinnati team has developed several novel designs for iron-oxide based nanoparticles that detect, diagnose and destroy cancer cells using photo-thermal therapy (PTT).
How does glass transition from a liquid to its familiar solid state? How does this common material transport heat and sound? And what microscopic changes occur when a glass gains rigidity as it cools? A team of researchers at New York Univ.'s Center for Soft Matter Research offers a theoretical explanation for these processes in Proceedings of the National Academy of Sciences.
Researchers at Nano-Meta Technologies Inc. have shown how to overcome key limitations of a material that could enable the magnetic storage industry to achieve data-recording densities far beyond today's computers. The new technology could make it possible to record data on an unprecedented small scale using tiny "nanoantennas" and to increase the amount of data that can be stored on a standard magnetic disk by 10 to 100 times.
Researchers at Massachusetts Institute of Technology say they have carried out a theoretical analysis showing that a family of 2-D materials exhibits exotic quantum properties that may enable a new type of nanoscale electronics. These materials are predicted to show a phenomenon called the quantum spin Hall (QSH) effect, and belong to a class of materials known as transition metal dichalcogenides, with layers a few atoms thick.
A potential path to identify imperfections and improve the quality of nanomaterials for use in next-generation solar cells has emerged from a collaboration of Univ. of Oregon and industry researchers. To increase light-harvesting efficiency of solar cells beyond silicon's limit of about 29%, manufacturers have used layers of chemically synthesized semiconductor nanocrystals.
Flexible electronic sensors based on paper have the potential to cut the price of a wide range of medical tools, from helpful robots to diagnostic tests. Scientists have now developed a fast, low-cost way of making these sensors by directly printing conductive ink on paper.
Argonne National Laboratory has announced a new intellectual property licensing agreement with AKHAN Semiconductor, continuing a productive public-private partnership that will bring diamond-based semiconductor technologies to market. The agreement gives AKHAN exclusive rights to a suite of breakthrough diamond-based semiconductor inventions developed by nanoscientist Ani Sumant of Argonne’s Center for Nanoscale Materials.
Univ. of Tennessee, Knoxville’s College of Engineering has made recent headlines for discoveries that, while atomically small, could impact our modern world. The team focused on the role of epilayer-substrate interactions in determining orientational relations in van der Waals epitaxy.