Nano planet

Researchers develop new biodegradable silicon transistor based on a material derived from wood

Physorg.com - 30 июня, 2015 - 18:00
Portable electronics users tend to upgrade their devices frequently as new technologies offering more functionality and more convenience become available. A report published by the U.S. Environmental Protection Agency in 2012 showed that about 152 million mobile devices are discarded every year, of which only 10 percent is recycled—a legacy of waste that consumes a tremendous amount of natural resources and produces a lot of trash made from expensive and non-biodegradable materials like highly purified silicon.
Категории: Nano planet

Atomic force microscope advance leads to new breast cancer research

Physorg.com - 30 июня, 2015 - 16:06
Researchers who developed a high-speed form of atomic force microscopy have shown how to image the physical properties of live breast cancer cells, for the first time revealing details about how deactivation of a key protein may lead to metastasis.
Категории: Nano planet

Team maps distribution of carbon nanotubes in composite materials

Physorg.com - 30 июня, 2015 - 15:38
Despite their small size and simple structure, carbon nanotubes—essentially sheets of graphene rolled up into straws—have all sorts of potentially useful properties. Still, while their promise looms large, how to fully realize that promise has proven to be something of a mystery.
Категории: Nano planet

Researchers calculate electrical properties of carbon cones, other shapes

Physorg.com - 30 июня, 2015 - 14:00
Flexing graphene may be the most basic way to control its electrical properties, according to calculations by theoretical physicists at Rice University and in Russia.
Категории: Nano planet

Pomegranate-like nanocomposites: The new avenue of graphene in water splitting

Physorg.com - 30 июня, 2015 - 13:05
The looming fossil energy crisis and serious environment and climate issues urgently call for sustainable energy systems and next-generation energy storage technologies. Instead of a traditional "carbon cycle" based on fossil energy, the "hydrogen cycle" has emerged and may be a promising alternative. With a water splitting device, H2 can be generated from water by electricity or solar energy, and energy transforms between electrical/solar and chemical energy in rechargeable batteries. However, the core issue of water splitting, oxygen evolution reaction (OER) (4OH- —> 2H2O + O2 + 4e-, in base), is a kinetically sluggish half-reaction, which requires a high overpotential and hinders the development of water splitting.
Категории: Nano planet

New nanogenerator harvests power from rolling tires

Physorg.com - 29 июня, 2015 - 19:29
A group of University of Wisconsin-Madison engineers and a collaborator from China have developed a nanogenerator that harvests energy from a car's rolling tire friction.
Категории: Nano planet

Microscale 'transformer' robots are joining forces to break through blocked arteries

Physorg.com - 27 июня, 2015 - 13:00
Swarms of microscopic, magnetic, robotic beads could be scrubbing in next to the world's top vascular surgeons—all taking aim at blocked arteries. These microrobots, which look and move like corkscrew-shaped bacteria, are being developed by mechanical engineers at Drexel University as a part of a surgical toolkit being assembled by the Daegu Gyeongbuk Institute of Science and Technology (DGIST) in South Korea.
Категории: Nano planet

Fuel-free nanomotor is powered by ultrasound and magnetic fields

Physorg.com - 26 июня, 2015 - 16:30
(Phys.org)—Nanoscale motors, like their macroscale counterparts, can be built to run on a variety of chemical fuels, such as hydrogen peroxide and others. But unlike macroscale motors, some nanomotors can also run without fuel, instead being powered by either magnetic or acoustic fields. In a new paper, researchers for the first time have demonstrated a nanomotor that can run on both magnetic and acoustic fields, making it the first magneto-acoustic hybrid fuel-free nanomotor.
Категории: Nano planet

Graphene breakthrough as Bosch creates magnetic sensor 100 times more sensitive than silicon equivalent

Physorg.com - 26 июня, 2015 - 15:22
Graphene Week 2015 is awash with outstanding research results, but one presentation has created quite a stir at this Graphene Flagship conference. To a stunned audience, Robert Roelver of Stuttgart-based engineering firm Bosch reported on Thursday that company researchers, together with scientists at the Max-Planck Institute for Solid State Research, have created a graphene-based magnetic sensor 100 times more sensitive than an equivalent device based on silicon.
Категории: Nano planet

Breakthrough graphene production could trigger revolution in artificial skin development

Physorg.com - 25 июня, 2015 - 17:44
A pioneering new technique to produce high-quality, low cost graphene could pave the way for the development of the first truly flexible 'electronic skin', that could be used in robots.
Категории: Nano planet

Researchers successfully control optical response of atomically thin materials on short timescale

Physorg.com - 25 июня, 2015 - 15:30
(Phys.org)—A team of researchers with member affiliations to Columbia and Stanford Universities has found a way to control the optical response of atomically thin materials on extremely short timescales. In their paper published in the journal Nature Photonics, the team describes their approach and why they believe it could help in the development of photonic devices.
Категории: Nano planet

3D plasmonic antenna capable of focusing light into few nanometers

Physorg.com - 25 июня, 2015 - 14:20
Professors Myung-Ki Kim and Yong-Hee Lee of the Physics Department at KAIST and their research teams developed a 3D gap-plasmon antenna which can focus light into a few nanometers wide space. Their research findings were published in the June 10th issue of Nano Letters.
Категории: Nano planet

Engineered particles produce toxins deadly to targeted bacteria

Physorg.com - 25 июня, 2015 - 13:18
The global rise in antibiotic resistance is a growing threat to public health, damaging our ability to fight deadly infections such as tuberculosis.
Категории: Nano planet

Towards graphene biosensors

Physorg.com - 24 июня, 2015 - 19:26
For the first time, a team of scientists has succeeded in precisely measuring and controlling the thickness of an organic compound that has been bound to a graphene layer. This might enable graphene to be used as a sensitive detector for biological molecules in the future.
Категории: Nano planet

Nanowires could be the LEDs of the future

Physorg.com - 24 июня, 2015 - 17:22
The latest research from the Niels Bohr Institute shows that LEDs made from nanowires will use less energy and provide better light. The researchers studied nanowires using X-ray microscopy and with this method they can pinpoint exactly how the nanowire should be designed to give the best properties. The results are published in the scientific journal, ACS Nano.
Категории: Nano planet

Researchers detect spin precession in silicon nanowires

Physorg.com - 24 июня, 2015 - 15:10
Scientists at the U.S. Naval Research Laboratory (NRL) have reported the first observation of spin precession of spin currents flowing in a silicon nanowire (NW) transport channel, and determined spin lifetimes and corresponding spin diffusion lengths in these nanoscale spintronic devices. The spin currents were electrically injected and detected using ferromagnetic metal contacts with a tunnel barrier consisting of single layer graphene between the metal and silicon NW.
Категории: Nano planet

A novel microscope for nanosystems

Physorg.com - 24 июня, 2015 - 15:03
Nanomaterials play an essential role in many areas of daily life. There is thus a large interest to gain detailed knowledge about their optical and electronic properties. Conventional microscopes get beyond their limits when particle size falls to the range of a few ten nanometers where a single particle provides only a vanishingly small signal. As a consequence, many investigations are limited to large ensembles of particles. Now, a team of scientists of the Laser Spectroscopy Division of Prof. Theodor W. Hänsch (Director at the Max Planck Institute of Quantum Optics and Chair for Experimental Physics at the Ludwig-Maximilians-Universität Munich) has developed a technique, where an optical microcavity is used to enhance the signals by more than 1000-fold and at the same time achieves an optical resolution close to the fundamental diffraction limit. The possibility to study the optical properties of individual nanoparticles or macromolecules promises intriguing potential for many areas of biology, chemistry, and nanoscience.
Категории: Nano planet

Nanostructure design enables pixels to produce two different colors

Physorg.com - 24 июня, 2015 - 14:40
Through precise structural control, A*STAR researchers have encoded a single pixel with two distinct colors and have used this capability to generate a three-dimensional stereoscopic image.
Категории: Nano planet

Researchers align atomic friction experiment

Physorg.com - 24 июня, 2015 - 12:50
Working together to study friction on the atomic scale, researchers at UC Merced and the University of Pennsylvania have conducted the first atomic-scale experiments and simulations of friction at overlapping speeds.
Категории: Nano planet

Nanoparticle 'wrapper' delivers chemical that stops fatty buildup in rodent arteries

Physorg.com - 24 июня, 2015 - 00:27
In what may be a major leap forward in the quest for new treatments of the most common form of cardiovascular disease, scientists at Johns Hopkins report they have found a way to halt and reverse the progression of atherosclerosis in rodents by loading microscopic nanoparticles with a chemical that restores the animals' ability to properly handle cholesterol.
Категории: Nano planet