Nano planet

Diode a few atoms thick shows surprising quantum effect

Physorg.com - 23 июня, 2015 - 16:38
A quantum mechanical transport phenomenon demonstrated for the first time in synthetic, atomically-thin layered material at room temperature could lead to novel nanoelectronic circuits and devices, according to researchers at Penn State and three other U.S. and international universities.
Категории: Nano planet

New 2-D material's properties show promise

Physorg.com - 23 июня, 2015 - 14:50
One completed a series of theoretical calculations to predict its properties with the help of a massive computing center. The other grew it in bulk before waxing its atom-thin whiskers with the assistance of adhesive tape.
Категории: Nano planet

Kirigami art could enable stretchable plasma screens

Physorg.com - 23 июня, 2015 - 14:40
The art of paper cutting may slice through a roadblock on the way to flexible, stretchable electronics, a team of engineers and an artist at the University of Michigan has found.
Категории: Nano planet

A dual-phase lithium metal anode for next-generation lithium-sulphur batteries

Physorg.com - 23 июня, 2015 - 13:41
Researchers have proposed an efficient and stable dual-phase lithium metal anode for Li-S batteries, containing polysulfide-induced solid electrolyte interphase and nanostructured graphene framework at Tsinghua University, appearing in ACS Nano.
Категории: Nano planet

Sweeping lasers snap together nanoscale geometric grids

Physorg.com - 23 июня, 2015 - 12:00
Down at the nanoscale, where objects span just billionths of a meter, the size and shape of a material can often have surprising and powerful electronic and optical effects. Building larger materials that retain subtle nanoscale features is an ongoing challenge that shapes countless emerging technologies.
Категории: Nano planet

Squares, triangles: Regardless of their form, bacteria can figure out where to split with a little help from Alan Turing

Physorg.com - 22 июня, 2015 - 18:00
The E.coli bacterium, a very common resident of people's intestines, is shaped as a tiny rod about 3 micrometers long. For the first time, scientists from the Kavli Institute of Nanoscience at Delft University have found a way to use nanotechnology to grow living E.coli bacteria into very different shapes: squares, triangles, circles, and even as letters spelling out 'TU Delft'. They also managed to grow supersized E.coli with a volume thirty times larger than normal. These living oddly-shaped bacteria allow studies of the internal distribution of proteins and DNA in entirely new ways.
Категории: Nano planet

Plasmonics: Revolutionizing light-based technologies via electron oscillations in metals

Physorg.com - 22 июня, 2015 - 16:20
For centuries, artists mixed silver and gold powder with glass to fabricate colorful windows to decorate buildings. The results were impressive, but they didn't have a scientific reason for how these ingredients together made stained glass. In the early 20th century, the physicist Gustav Mie figured out that the color of a metal nanoparticle is related to its size and the optical properties of the metal and adjacent materials.
Категории: Nano planet

Varying the sliding properties of atoms on a surface

Physorg.com - 22 июня, 2015 - 14:50
It's possible to vary (even dramatically) the sliding properties of atoms on a surface by changing the size and "compression" of their aggregates: an experimental and theoretical study conducted with the collaboration of SISSA, the Istituto Officina dei Materiali of the CNR (Iom-Cnr-Democritos), ICTP in Trieste, the University of Padua, the University of Modena e Reggio Emilia, and the Istituto Nanoscienze of the CNR (Nano-Cnr) in Modena, has just been published in Nature Nanotechnology.
Категории: Nano planet

Soft core, hard shell – the latest in nanotechnology

Physorg.com - 22 июня, 2015 - 14:22
Nanoparticles are the smallest particles capable of reaching virtually all parts of the body. Researchers use various approaches to test ways in which nanoparticles could be used in medicine – for instance, to deliver substances to a specific site in the body such as a tumor. For this purpose, nanoparticles are generally coated with organic materials because their surface quality plays a key role in determining further targets in the body. If they have a water-repellent shell, nanoparticles are quickly identified by the body's immune system and eliminated.
Категории: Nano planet

Uncovering the mechanism of photoluminescence stabilization in semiconductor nanoparticles

Physorg.com - 19 июня, 2015 - 15:20
A collaborative of Korean researchers has discovered the mechanism of photoluminescence (PL) loss from semiconductor nanoparticles called quantum dots (QDs) and proposed an effective method for stabilization of PL.
Категории: Nano planet

Modeling how thin films break up

Physorg.com - 19 июня, 2015 - 14:22
Excess surface energy from unsatisfied bonds is a significant driver of dimensional changes in thin-film materials, whether formation of holes, contracting edges, or run-away corners. In general, this break-up of a material is known as dewetting. Recent MIT graduate Rachel V. Zucker, who received her PhD on June 5, has developed a range of mathematical solutions to explain various dewetting phenomena in solid films.
Категории: Nano planet

Chemical vapor deposition enables production of pure, uniform coatings of metals or polymers

Physorg.com - 19 июня, 2015 - 14:00
In a sense, says MIT chemical engineering professor Karen Gleason, you can trace the technology of chemical vapor deposition, or CVD, all the way back to prehistory: "When the cavemen lit a lamp and soot was deposited on the wall of a cave," she says, that was a rudimentary form of CVD.
Категории: Nano planet

Adapting nanoscience imaging tools to study ants' heat-deflecting adaptations

Physorg.com - 19 июня, 2015 - 13:40
The tiny hairs of Saharan silver ants possess crucial adaptive features that allow the ants to regulate their body temperatures and survive the scorching hot conditions of their desert habitat. According to a new research paper published in the journal Science, the unique triangular shape and internal structure of the hairs play a key role in maintaining the ant's average internal temperature below the critical thermal maximum of 53.6 degrees Celsius (128.48 degrees Fahrenheit) most of the time despite midday Saharan temperatures that can reach up to 70°C (158°F).
Категории: Nano planet

Unique reducers and new hydrocarbon synthesis methods for five new calcium carbides

Physorg.com - 19 июня, 2015 - 13:30
A team led by MIPT Professor Artem Oganov has used computer simulation to predict the existence of five completely new compounds of carbon and calcium with varied chemical and physical properties, obtaining two of them by experiment. The journal Nature Communications has published an article featuring the results of the study.
Категории: Nano planet

Biomedical breakthrough: Carbon nanoparticles you can make at home

Physorg.com - 18 июня, 2015 - 19:21
Researchers have found an easy way to produce carbon nanoparticles that are small enough to evade the body's immune system, reflect light in the near-infrared range for easy detection, and carry payloads of pharmaceutical drugs to targeted tissues.
Категории: Nano planet

Engineers find a simple yet clever way to boost chip speeds

Physorg.com - 18 июня, 2015 - 02:05
A typical computer chip includes millions of transistors connected with an extensive network of copper wires. Although chip wires are unimaginably short and thin compared to household wires both have one thing in common: in each case the copper is wrapped within a protective sheath.
Категории: Nano planet

Toward nanorobots that swim through blood to deliver drugs

Physorg.com - 18 июня, 2015 - 01:59
Someday, treating patients with nanorobots could become standard practice to deliver medicine specifically to parts of the body affected by disease. But merely injecting drug-loaded nanoparticles might not always be enough to get them where they need to go. Now scientists are reporting in the ACS journal Nano Letters the development of new nanoswimmers that can move easily through body fluids to their targets.
Категории: Nano planet

A new look at surface chemistry

Physorg.com - 18 июня, 2015 - 01:57
For the first time in the long and vaunted history of scanning electron microscopy, the unique atomic structure at the surface of a material has been resolved. This landmark in scientific imaging was made possible by a new analytic technique developed by a multi-institutional team of researchers, including scientists from the U.S. Department of Energy (DOE)'s Lawrence Berkeley National Laboratory (Berkeley Lab).
Категории: Nano planet

Hooked on phonons: Research group measures graphene vibrations

Physorg.com - 17 июня, 2015 - 16:10
An international research group led by scientists at the National Institute of Standards and Technology's (NIST) Center for Nanoscale Science and Technology has developed a method for measuring crystal vibrations in graphene. Understanding these vibrations is a critical step toward controlling future technologies based on graphene, a one-atom thick form of carbon.
Категории: Nano planet

Nanoparticles to kill cancer cells with heat

Physorg.com - 17 июня, 2015 - 16:00
Heat may be the key to killing certain types of cancer, and new research from a team including National Institute of Standards and Technology (NIST) scientists has yielded unexpected results that should help optimize the design of magnetic nanoparticles that can be used to deliver heat directly to cancerous tumors.
Категории: Nano planet