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Showing Spotlights 529 - 536 of 2007 in category (newest first):

 

Ordered intermetallic core-shell nanocatalysts are promising designs for fuel cells

nanocatalystNew research shows that ordered intermetallic core-shell nanocatalysts are highly promising designs for fuel cells. These are the newest members to platinum-iron alloy nanocatalysts with such intermetallic core-shell (IMCS) design. Furthermore, on characterizing them after 10,000 cycles, they still retain their structural ordering at the core while the platinum shell got thicker and thicker. Such a static core-dynamic shell (SCDS) regime is being reported for the first time.

Posted: Jul 8th, 2013

Atomic calligraphy - using MEMS to write nanoscale structures

MEMS_deviceOne of the most restricting parameters in nanofabrication is the difficulty involved with controllably patterning materials at precise locations in a repeatable manner over relatively large areas. A novel microelectromechanical system (MEMS)-based mask writer has now been developed by a team of researchers. The device allows to directly write structures at the nanoscale without the need to use photoresist, lift-off techniques or other complex and expensive approaches. The technique uses a MEMS plate with apertures drilled into it and a shutter so that one can, in effect, spray paint with atoms.

Posted: Jul 3rd, 2013

Preserving the edge magnetism of graphene nanoribbons

graphene_edgeEdge magnetism is a unique property of graphene ribbons that has been predicted by theory, but not yet directly confirmed experimentally. If researchers want to utilize zigzag graphene nanoribbons (zGNRs) in spintronics, they first need to figure out a suitable termination group for zGNRs. The often used hydrogen atom termination is not a good choice since hydrogen terminated zGNRs can only be stabilized at extremely low hydrogen concentrations. In new work, researchers designed special boundaries for zGNRs that could become both stable and maintain the edge magnetism.

Posted: Jul 2nd, 2013

An overview of the European Union's nanotechnology projects

EuropeA new publication outlines nanoscience and nanotechnology dedicated research expenditure in Europe over recent years, in particular via the 7th research framework programme (FP7). It highlights a selection of exemplary projects financed through FP7 that are representative of major research themes, such as nanoelectronics, nanophotonics, nanobiotechnology, nanomedicine, self-assembly, catalysts, industrial applications, energy and environment, tools for investing the nanoscale, health/safety/environment and communication/societal impact.

Posted: Jul 1st, 2013

High-performance graphene transistor with high room-temperature mobility

graphene_transistorUtilization of graphene may help realize innovative low power replacements for III-V materials based high electron mobility transistors while extending operational frequencies closer to the THz regime for superior wireless communications, imaging, and other novel applications. Device architectures explored to date suffer a fundamental performance roadblock due to lack of compatible deposition techniques for nanoscale dielectrics required to efficiently modulate graphene transconductance while maintaining low gate capacitance-voltage product. In new work, researchers have shown that a double layer of graphene with structural transformation to a striped channel architecture can produce high field effect mobility at a very low operation voltage.

Posted: Jun 26th, 2013

Nanoscale chemistry allows microfluidics without channels and troughs

dropletIn a seminal paper more than 20 years ago, scientists described a device that was capable of causing drops of water placed on it to move uphill. However, as it turned out in subsequent research, drops of water are notoriously difficult to move from where they lie, unless they are large enough to be moved by gravity. In the absence of a microtube or of a channel - as they are required by most microfluidic devices - it usually is not possible to apply the pressure needed to induce liquid movement. An alternative approach, developed by researchers in Italy, is to pattern a gradient on a surface which allows a droplet to move in order to minimize its free energy.

Posted: Jun 25th, 2013

3D nanolithography without the expensive hardware

nano-volcanoWhile researchers are working on developing more cost-effective nanolithographic tools such as for instance superlens lithography, one of the key problems with nanofabrication is how to generate ever-challenging patterns with high resolution - especially for 3D nanostructures - and at the same time substantially reduce the cost of the process. A novel nanolithography method is based on light scattering from nanoparticles, which can generate 3D hollow-core structures that resembles 'nano-volcanoes'. Different from traditional lithography methods that are typically based on complex systems, this process relies solely on the light interaction with a single nanoparticle. No masks and external optics are needed in this approach, and light is manipulated into the desired optical pattern solely by the colloids.

Posted: Jun 24th, 2013

Innovative nanoparticle therapy to treat infected burn wounds

burn_woundDespite significant advances in the medical/surgical management of severe thermal injury, wound infection and subsequent sepsis persist as frequent causes of morbidity and mortality for burn victims not only due to the extensive compromise of the protective barrier against microbial invasion, but also as a result of growing pathogen resistance to our therapeutic options. Researchers have now demonstrated that encapsulating Amphotericin B, a intravenously administered potent fungicidal polyene macrolide, in nanoparticles increased its killing impact against numerous candida species, was more effective at preventing candidal biofilm formation, and cleared a mouse burn model infected with candida more effectively than solubilized amphotericin.

Posted: Jun 21st, 2013