Researchers in Europe have succeeded for the first time in growing single-walled carbon nanotubes with only a single, prespecified structure. The nanotubes thereby have identical electronic properties. The decisive trick was producing the carbon nanotube from custom-made organic precursor molecules.
Lawrence Livermore National Laboratory researchers have made a material that is 10 times stronger and stiffer than traditional aerogels of the same density. This ultra-low-density, ultra-high surface area bulk material with an interconnected nanotubular makeup could be used in catalysis, energy storage and conversion, thermal insulation, shock energy absorption and high energy density physics.
A team of materials chemists, polymer scientists, device physicists and others at the Univ. of Massachusetts Amherst report a breakthrough technique for controlling molecular assembly of nanoparticles over multiple length scales that should allow faster, cheaper, more ecologically friendly manufacture of organic photovoltaics and other electronic devices.
Inspired by the discovery of “race track memory” by IBM researchers, scientists at the Univ. of California, Davis, with the support of the Semiconductor Research Corp., are investigating complex oxides that could be used to manipulate magnetic domain walls within the wires of semiconductor memory devices at nanoscale dimensions. This research may lead to devices that displace existing magnetic hard disk drive and solid state RAM solutions.
Injuries, birth defects (such as cleft palates) or surgery to remove a tumor can create gaps in bone that are too large to heal naturally. And when they occur in the head, face or jaw, these bone defects can dramatically alter a person’s appearance. Researchers have developed a “self-fitting” material that expands with warm salt water to precisely fill bone defects, and also acts as a scaffold for new bone growth.
Researchers at Oregon State Univ. have developed a model that explains how geckos, as well as spiders and some insects, can run up and down walls, cling to ceilings and seemingly defy gravity with such effortless grace. This ability is a remarkable mechanism in the toes of geckos that uses tiny, branched hairs called “seta” that can instantly turn their stickiness on and off, and even “unstick” their feet without using any energy.
A catalyst made from a foamy form of copper has vastly different electrochemical properties from catalysts made with smooth copper in reactions involving carbon dioxide, a new study shows. The research, by scientists in Brown Univ.’s Center for the Capture and Conversion of CO2, suggests that copper foams could provide a new way of converting excess CO2 into useful industrial chemicals.
North Carolina State Univ. is part of a project team that is researching and developing new catalyst technology to produce the commercially important chemicals ethylene and propylene from natural gas. The project lead, Bio2Electric, LLC, dba EcoCatalytic Technologies, is collaborating with North Carolina State Univ., among other industry partners, to develop the new catalyst technologies.
A Rice Univ. laboratory has provided proof that foam may be the right stuff to maximize enhanced oil recovery (EOR). In tests, foam pumped into an experimental rig that mimicked the flow paths deep underground proved better at removing oil from formations with low permeability than common techniques involving water, gas, surfactants or combinations of the three.
As hemp makes a comeback in the U.S. after a decades-long ban on its cultivation, scientists are reporting that fibers from the plant can pack as much energy and power as graphene, long-touted as the model material for supercapacitors. A team has figured out how to make electrodes from certain hemp fibers, and the breakthrough came from figuring out how to process them.
Using a relatively straightforward technique, a team of NIST researchers has created what may be the most highly enriched silicon currently being produced. The material is more than 99.9999% pure silicon-28, with less than 1 part per million (ppm) of the problematic isotope silicon-29. Many quantum computing schemes require isotopically pure silicon, for example to act as a substrate for qubits.
An international team of researchers has taken a significant step towards understanding the fundamental properties of the 2-D material silicene by showing that it can remain stable in the presence of oxygen. In a study published in 2D Materials, the researchers have shown that thick multi-layers of silicene can be isolated from parent material silicon and remain intact when exposed to air for at least 24 hrs.
Zeolites used extensively in industry are promising catalysts that turn biomass into transportation fuels, but the activity and stability of this class of materials is challenging to understand and predict. Employing a combination of methods devised at Pacific Northwest National Laboratory and the Swiss Light Source, scientists were able to determine the distribution of aluminum ions in structural variants of zeolites.
Researchers at the National Physical Laboratory in the U.K. have discovered that the conductivity at the edges of graphene devices is different to the central material. The group used local scanning electrical techniques to examine the local nanoscale electronic properties of epitaxial graphene, in particular the differences between the edges and central parts of graphene Hall bar devices.
Wrapping wound dressings around fingers and toes can be tricky, but for burn victims, guarding them against infection is critical. At the National Meeting & Exposition of the American Chemical Society scientists have reported the development of new ultra-thin coatings called nanosheets that can cling to the body's contours and keep bacteria at bay. The super-thin sheets have been tested on mice and could help transform burn treatment.
Scientists in Israel have recently used nanocubes to create surprisingly yarn-like strands: They showed that given the right conditions, cube-shaped nanoparticles are able to align into winding helical structures. Their results reveal how nanomaterials can self-assemble into unexpectedly beautiful and complex structures.
In the developing brain, special proteins that act like molecular tugboats push or pull on growing nerve cells, or neurons, helping them navigate to their assigned places amidst the brain’s wiring. How a single protein can exert both a push and a pull force to nudge a neuron in the desired direction is a longstanding mystery that has now been solved by scientists from Dana-Farber Cancer Institute.
A multi-institutional team has resolved a long-unanswered question about how two of the world’s most common substances interact. In a paper published recently in Nature Communications, an international team reported fundamental discoveries about how water reacts with metal oxides. The paper opens doors for greater understanding and control of chemical reactions in fields ranging from catalysis to geochemistry and atmospheric chemistry.
Univ. College London scientists have discovered a new method to efficiently generate and control currents based on the magnetic nature of electrons in semiconducting materials, offering a new way to develop a new generation of electronic devices. One promising approach to developing new technologies is to exploit the electron’s tiny magnetic moment, or spin.
It’s estimated that more than half of U.S. energy is wasted as heat. Mostly, this waste heat simply escapes into the air. But that’s beginning to change, thanks to thermoelectric innovators such as Massachusetts Institute of Technology’s Gang Chen. Thermoelectric materials convert temperature differences into electric voltage.
Performing systematic analyses of both known and imagined chemical compounds to find their key properties, Northwestern Univ. engineers have created a database that takes some of the guesswork out of designing new materials. Called the Open Quantum Materials Database (OQMD), it launched in November and is the largest database in the world of its kind, containing analyses of 285,780 compounds and growing.
Some of the most damaging brain diseases can be traced to irregular blood delivery in the brain. Now, Stanford Univ. chemists have employed lasers and carbon nanotubes to capture an unprecedented look at blood flowing through a living brain. The technique was developed for mice but could one day be applied to humans, potentially providing vital information in the study of stroke and migraines.
For decades, scientists have been trying to use quantum systems for logical calculations, but implementing a system that manages superposition states is challenging. A team of researchers in Austria and Japan has now proposed a new architecture based on microscopic defects in diamond. They are convinced that the basic elements of their newly proposed architecture are better suited to be miniaturized, mass-produced and integrated on a chip.
Graphene has excellent biocompatibility thanks to its great flexibility and chemical durability, and its conducting properties suggest uses for prosthetic devices in humans. Physicists are now developing key components of an artificial retina made of graphene. These retina implants may one day serve as optical prostheses for blind people whose optical nerves are still intact.
For the first time, researchers have succeeded in "growing" single-wall carbon nanotubes (CNT) with a single predefined structure, and hence with identical electronic properties. The method involved self-assembly of tailor-made organic precursor molecules on a platinum surface. In the future, carbon nanotubes of this kind may be used in ultra-sensitive light detectors and ultra-small transistors.