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Immune cells don't always ward off carbon nano invaders

Nanotech-Now - February 27, 2016 - 7:45am
Scientists at the University of Michigan have found evidence that some carbon nanomaterials can enter into immune cell membranes, seemingly going undetected by the cell's built-in mechanisms for engu...

FLEXcon Shares Insights on Developments and Safety Guidelines in Nanotechnology - Business Wire (press release)

InterNano Industry News - February 27, 2016 - 4:45am
FLEXcon Shares Insights on Developments and Safety Guidelines in NanotechnologyBusiness Wire (press release)The event brought together members of NENA, an association committed to sharing information, energy, and ideas for fostering nanotechnology innovation, commercialization and economic prosperity to benefit both the people and environment of New ...and more »
Categories: Nanotechnology News

Switchable material could enable new memory chips

InterNano Industry News - February 27, 2016 - 4:45am
Two MIT researchers have developed a thin-film material whose phase and electrical properties can be switched between metallic and semiconducting simply by applying a small voltage. The material then stays in its new configuration until switched back by another voltage. The discovery could pave the way for a new kind of “nonvolatile” computer memory chip that retains information when the power is switched off, and for energy conversion and catalytic applications. The findings, reported in the journal Nano Letters in a paper by MIT materials science graduate student Qiyang Lu and associate professor Bilge Yildiz, involve a thin-film material called a strontium cobaltite, or SrCoOx. Usually, Yildiz says, the structural phase of a material is controlled by its composition, temperature, and pressure. “Here for the first time,” she says, “we demonstrate that electrical bias can induce a phase transition in the material. And in fact we achieved this by changing the oxygen content in SrCoOx.” “It has two different structures that depend on how many oxygen atoms per unit cell it contains, and these two structures have quite different properties,” Lu explains. One of these configurations of the molecular structure is called perovskite, and the other is called brownmillerite. When more oxygen is present, it forms the tightly-enclosed, cage-like crystal structure of perovskite, whereas a lower concentration of oxygen produces the more open structure of brownmillerite. The two forms have very different chemical, electrical, magnetic, and physical properties, and Lu and Yildiz found that the material can be flipped between the two forms with the application of a very tiny amount of voltage — just 30 millivolts (0.03 volts). And, once changed, the new configuration remains stable until it is flipped back by a second application of voltage. Strontium cobaltites are just one example of a class of materials known as transition metal oxides, which is considered promising for a variety of applications including electrodes in fuel cells, membranes that allow oxygen to pass through for gas separation, and electronic devices such as memristors — a form of nonvolatile, ultrafast, and energy-efficient memory device. The ability to trigger such a phase change through the use of just a tiny voltage could open up many uses for these materials, the researchers say. Previous work with strontium cobaltites relied on changes in the oxygen concentration in the surrounding gas atmosphere to control which of the two forms the material would take, but that is inherently a much slower and more difficult process to control, Lu says. “So our idea was, don’t change the atmosphere, just apply a voltage.” “Voltage modifies the effective oxygen pressure that the material faces,” Yildiz adds. To make that possible, the researchers deposited a very thin film of the material (the brownmillerite phase) onto a substrate, for which they used yttrium-stabilized zirconia. In that setup, applying a voltage drives oxygen atoms into the material. Applying the opposite voltage has the reverse effect. To observe and demonstrate that the material did indeed go through this phase transition when the voltage was applied, the team used a technique called in-situ X-ray diffraction at MIT’s Center for Materials Science and Engineering. The basic principle of switching this material between the two phases by altering the gas pressure and temperature in the environment was developed within the last year by scientists at Oak Ridge National Laboratory. “While interesting, this is not a practical means for controlling device properties in use,” says Yildiz. With their current work, the MIT researchers have enabled the control of the phase and electrical properties of this class of materials in a practical way, by applying an electrical charge.   In addition to memory devices, the material could ultimately find applications in fuel cells and electrodes for lithium ion batteries, Lu says. “Our work has fundamental contributions by introducing electrical bias as a way to control the phase of an active material, and by laying the basic scientific groundwork for such novel energy and information processing devices,” Yildiz adds. In ongoing research, the team is working to better understand the electronic properties of the material in its different structures, and to extend this approach to other oxides of interest for memory and energy applications, in collaboration with MIT professor Harry Tuller. José Santiso, the nanomaterials growth division leader at the Catalan Institute of Nanoscience and Nanotechnology in Barcelona, Spain, who was not involved in this research, calls it “a very significant contribution” to the study of this interesting class of materials, and says “it paves the way for the application of these materials both in solid state electrochemical devices for the efficient conversion of energy or oxygen storage, as well as in possible applications in a new kind of memory devices.” The work was supported by the National Science Foundation.
Categories: Nanotechnology News

Flexible transparent electrodes for photovoltaics

InterNano Industry News - February 27, 2016 - 4:45am
Two simple room-temperature and solution-based chemical processes are used to realize a new class of silver nano-network-based devices.
Categories: Nanotechnology News

Researchers from MGH Develop New Nanoparticle for Treating Pancreatic Cancer

InterNano Industry News - February 27, 2016 - 4:45am
Nature Nanotechnology, an online manual, has published a report outlining the concept of combining nanoparticles with molecular and photodynamic therapies in order to deliver anticancer treatment, and...
Categories: Nanotechnology News

Graphene slides friction-free over gold

Nanotechweb - February 26, 2016 - 8:13am
Carbon sheet could be used as an ultrasmooth coating in machine components, so drastically reducing energy losses.

Supercritically charged vacancy in graphene is like an artificial atom

Nanotechweb - February 26, 2016 - 7:58am
Physicists have discovered a new way to control and guide electrons in graphene by removing a single carbon atom from its perfect honeycombed lattice.

Tungsten 2D material devices prove stable in air

Nanotechweb - February 26, 2016 - 7:13am
A WSe2(1–x)S2x field-effect transistor has promising tunable electrical properties that are undamaged after three months' exposure to air.

2D Materials Processing Technology Workshop

InterNano - Upcoming Events - February 25, 2016 - 2:57pm
Workshop/TrainingThursday, April 7, 2016 - 9:30am to 4:30pmManchester, Greater Manchester, GB https://www.eventbrite.com/e/2d-materials-processing-technology-workshop-tickets-21301400061 A one day seminar organised with the National Graphene Centre, The University of Manchester. Speakers from Oxford Instruments, The University of Manchester and guest speakers on topics including: ALD for 2D materials Etch process developments 2D processing advances ICP-CVD process technology for 2D materials Full programme and registration details will be available shortly.

Cerion, LLC

National Nanomanufacturing Network - February 25, 2016 - 2:47pm
Cerion’s core expertise is the development, customization and manufacture of high-performance metal, metal oxide and mixed metal nanoparticles for a wide range of industrial products including (but not limited to) coatings/thin films, catalysts, additives, printed electronics and antimicrobials. Our team's unique expertise was established during their tenure at Kodak, where they were global leaders in the stable dispersion of metal nanoparticle colloids for photographic film emulsions. One Blossom Road Rochester, NY 14610

Nanotechnology and Electronics – Becoming Pervasive

National Nanomanufacturing Network - February 25, 2016 - 2:11pm
Alan Rae, Ph.D., M.B.AAbout 8 years ago I gave a presentation to the SMTA Pan-Pacific meeting on nanotechnology and how it was going to influence electronics packaging and assem

A New Way to Print 3-D Metals and Alloys

National Nanomanufacturing Network - February 25, 2016 - 12:32pm
New rapid method expands the types of metals, alloys, and architectures that can be additively manufactured

Study Finds No Safety Threat from Brief Exposure to Industrial Nanoparticles

National Nanomanufacturing Network - February 25, 2016 - 11:33am
Jill Goetz, Univeristy of Arizona - College of Engineering - NewsA multi-university research team based at the UA has found that nano-engineered materials widely used in semiconductor manufacturing pose low environmental risk.

What makes penguin feathers ice-proof

Nanotech-Now - February 25, 2016 - 7:45am
Humboldt penguins live in places that dip below freezing in the winter, and despite getting wet, their feathers stay sleek and free of ice. Scientists have now figured out what could make that possibl...

Clinatec Announces €30M Fundraising Campaign to Speed Research In Treatment of Neurodegenerative Diseases, Cancer and Motor Disabilities

Nanotech-Now - February 25, 2016 - 7:45am
Projects include adapting a brain-computer interface to an exoskeleton system to provide mobility to quadriplegics, and using near-infrared radiation to slow Parkinson’s disease.

Stanford, NASA, Princeton Scientists to Speak on Energy, Sustainability, Biomedical Engineering

Nanotech-Now - February 25, 2016 - 7:45am
The South Dakota School of Mines & Technology Chemical and Biological Engineering speaker series kicked off today with Stacey Bent, Ph.D., of Stanford University, who spoke on nanoscale materials for...

George Clark Named Chief Financial Officer and Associate Laboratory Director for Business Services at Brookhaven Lab

Nanotech-Now - February 25, 2016 - 7:45am
George Clark, a certified public accountant with more than 20 years' experience at Oak Ridge and Pacific Northwest national laboratories, has been named Chief Financial Officer (CFO) and Associate Lab...

Risk Analysis Publishes Non-Animal Strategy to Assess Nanomaterials

Nanotech-Now - February 25, 2016 - 7:45am
Non-animal methods can be used to evaluate the health and environmental effects of nanomaterials, according to an article that appears today in Risk Analysis.