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Showing Spotlights 785 - 792 of 2113 in category (newest first):


Nanotechnology and the environment - Potential benefits and sustainability effects

environmentNanotechnology products, processes and applications have the potential to make important contributions to environmental and climate protection by helping save raw materials, energy and water as well as by reducing greenhouse gases and problematic wastes. Great hopes are being placed on nano-technologically optimized products and processes that are currently under development in the energy production and storage sectors. Emphasis is often placed on the sustainable potential of nanotechnology, but this in fact represents a poorly documented expectation. Determining a product's actual effect on the environment - both positive and negative - requires considering the entire life cycle from the production of the base materials to disposal at the end of its useful life. Not every 'nano-product' is a priori environmentally friendly or sustainable, and the production of nanomaterials often requires large amounts of energy, water and environmentally problematic chemicals.

Posted: Jul 11th, 2012

Towards high-throughput, mechanisms-based toxicity testing of nanomaterials

toxicity_assaysUnderstanding the health and environmental impact of nanomaterials is vital to the sustainable and responsible development of nanotechnology. Currently, small animal experiments are the 'gold standard' for nanomaterial toxicity testing. However, a detailed understanding often requires dozens of animals and can take many months to complete. Dr. Andre Nel and his coworkers at the California NanoSystems Institute (CNSI) and the University of California Los Angeles (UCLA) are taking a fundamentally different approach to nanomaterial toxicity testing. Nel believes that, under the right circumstances, resource-intensive animal experiments can be replaced or adjusted with comparatively simple in vitro assays. This article explores his approach and its implications for nanomaterial design and development.

Posted: Jul 9th, 2012

Paralysis by analysis - European Commission appears to be stuck in perpetual review mode on nanosilver

europeA commentary by Steffen Foss Hansen and Anders Baun in this week's Nature Nanotechnology pointedly asks "when will governments and regulatory agencies stop asking for more reports and reviews, and start taking regulatory action?" The two scientists take issue with yet another scientific opinion on nanosilver that has been requested by the European Commission in late 2011: "SCENIHR - Request for a scientific opinion on Nanosilver: safety, health and environmental effects and role in antimicrobial resistance". Specifically, the EC wants SCENIHR to answer four questions under the general heading of 'Nanosilver: safety, health and environmental effects, and role in antimicrobial resistance'. These questions, however, have already been addressed by no less than 18 review articles in scientific journals.

Posted: Jul 4th, 2012

Move over touchscreen - here comes a touchless interface that senses your fingertips

fingertipOver the past few years, touchscreens have become ubiquitous in the world of mobile electronic devices. A next generation of touch sensing devices will be vastly more advanced and lead to ultrasensitive artificial skins. Another, novel model for advanced man-machine interactive systems could be based on moisture detectors. Here, actual touch is no longer necessary for a positioning interface to react; rather, the distribution of water molecules that exists around all humid surfaces, such as a human finger, would be sufficient to trigger a response. Researchers in China have now demonstrate such a flexible touchless positioning interface based on the spatial mapping of moisture distribution.

Posted: Jul 3rd, 2012

Nanotechnology sensor detects flu viruses in exhaled breath

flu_virusBreath analysis of exhaled breath condensate has been increasingly recognized as a promising diagnostic method to link specific gaseous components in human breath to medical conditions and exposure to chemical compounds. Sampling breath is also much less invasive than testing blood, can be done very quickly, and creates as good as no biohazard waste. Studies have shown that exhaled breath from a flu patient contains influenza viruses but, although the use of silicon nanowire (SiNW) sensors for virus detection is not new, so far no studies have been conducted to apply silicon nanowire technology to the diagnosis of flu. Now, new research suggests that a SiNW sensor device, when calibrated by virus standards and exhaled breath condensate controls, can be reliably applied to the diagnosis of flu in a clinical setting with two orders of magnitude less time compared to the gold standard method RT-qPCR.

Posted: Jun 29th, 2012

Mass production of high quality graphene: An analysis of worldwide patents

grapheneGraphene is undoubtedly emerging as the most promising nanomaterial because of its unique combination of superb properties, which opens a way for its exploitation in a wide spectrum of applications. However, it has to overcome a number of obstacles before we can realize its full potential for practical applications. One of the greatest challenges being faced today in commercializing graphene is how to produce high quality material, on a large scale at low cost, and in a reproducible manner. The major hurdle in manufacturing graphene on an industrial scale is the process complexity and the associated high cost of its production, which results in expensive product. In the present article, an attempt has been made to carry out an extensive survey and analysis of global patents pertaining to the various processes of graphene synthesis.

Posted: Jun 28th, 2012

Painting with biomolecules at the nanoscale

mona_lisaMany nanotechnology projects require some form of nanopatterning technique for fabricating the devices, structures and surfaces required in fields ranging from electronics to photonics, security, biotechnology and medicine. Although they may not be visible to the naked eye, the nanometer-sized trenches, ridges, curves and grooves of these patterns and surfaces have a very visible impact. Researchers have developed a wide range of nanopatterning techniques, from top-down methods such as nanoimprint, e-beam or UV lithography to bottom-up techniques such as transfer nanolithography or nanopositioning on DNA or protein scaffolds. A novel technique uses a biofunctionalization approach based on resist-less electron-beam-induced deposition of carbon-containing nanofeatures, that has been developed into a universal biofunctionalization platform. This unique ability can be exploited for biological experiments, where cells respond to the nanoscale density of activating molecules such as antibodies.

Posted: Jun 26th, 2012

Charging your cell phone with your T-shirt

t-shirtThe future of electronics will be flexible. Not only will you be able to roll up your iPads and smart phones like a piece of paper, electronic devices will be invisibly embedded in the textiles you wear from baby diapers to doctors' surgical gloves. To realize such devices, equally flexible power sources need to be integrated with the electronic devices. Textile yarns are an obvious choice. Researchers are already pushing ahead with electronic textiles (e-textiles), for instance by coating regular cotton yarns with single-walled and multi-walled carbon nanotubes and polyelectrolytes, thus making cotton fibers conductive. Addressing the power source issue, researchers have now found a simple way to provide cotton with a new function - storing energy.

Posted: Jun 25th, 2012