Showing Spotlights 1265 - 1272 of 2426 in category All (newest first):
Energy generation and storage is an important issue at the nanoscale. For tiny devices such as nano- and micro-electromechanical systems, autonomous power sources are crucial for practical applications. Progress is being made in designing and fabricating nanoscale power generators. But, as with the large, macroscale systems of future smart grids, there might be times when powered nanodevices need to bridge a slump in power generation/harvesting or they might be designed to run on stored energy altogether for a limited period of time. Researchers in China are now proposing that the high energy density and power density of carbon nanotubes makes them promising materials for the storage of mechanical energy. The team provides a structural model towards mechanical energy storage for nanodevices and also demonstrates a method to characterize and manipulate ultralong CNTs.
Jul 11th, 2011
Silicone elastomers are widely used for biomedical applications and products. One major challenge for biomedical applications is to control the ingrowth of silicone-based implants and to avoid bacterial infections on device surfaces. The use of ions from metals like silver and copper is a promising, long-lasting method to achieve such bioactive effects. Researchers have now found a novel effect caused by a combination of copper and silver nanoparticles in silicone. By fabricating bioactive nanocomposite materials that release these ions in specific concentration levels and during a long time, manufacturers can control the bioactive effects of their medical devices or implants.
Jul 8th, 2011
Blood platelets are the structural and chemical foundation of blood clotting and they play a vital role in minor injuries when coagulation prevents the loss of blood at the injury site. If the proper function of these platelets gets disturbed, blood clotting can lead to thrombosis, which is a leading cause of death and disability in the developed world. In view of the rapid development of nanotechnology, the impact of the newly engineered nanomaterials as an additional thrombosis risk factor is not yet known but should not be underestimated. In fact, it has been reported that carbon nanotubes induce platelet aggregation and potentiate arterial thrombosis in animal model. However, a mechanism of thrombogenic effects of carbon nanotubes was not known. Researchers have now shown that show the molecular mechanism of carbon nanotubes' induced platelets activation.
Jul 7th, 2011
The field of single-molecule magnets is very promising, since an individual magnetic molecule represent the ultimate size limit to store and processing information. Magnetic molecules are considered very promising for spintronics since they can store a bit of information in an extremely small volume. However, in order to make magnetic molecules work, one has to find a way to measure their magnetization. Usual approaches are often very invasive and may lead to a strong perturbation of the properties of the molecules. A European research team has now designed and realized a novel hybrid spintronic nanodevice where the state of the molecule is measured 'indirectly', through a sensor coupled with the molecule.
Jul 5th, 2011
The efforts undertaken in developing renewable energy sources to reduce our dependence on fossil fuels include major research and investment in advanced electricity storage technologies. Among the various existing technologies, lithium batteries are considered as the most competitive power source because of their high energy density, superior power capability, design flexibility and longer lifespan. This article provides an overview of the current patent landscape of rechargeable Li-ion battery, with a focus on the recent developments on nanomaterials and nanotechnologies used for anode, cathode, and electrolyte materials, and the impact of nanomaterials on the performance of rechargeable lithium batteries. Effort has also been taken to identify key players, emerging trends and applications in this area.
Jul 1st, 2011
There has been tremendous interest in cloaking technology using metamaterials and there are two exciting possibilities to obtain drastic scattering reduction from moderately-sized objects. One is the concept of plasmonic cloaking, which is based on the use of a thin metamaterial cover to suppress the scattering from a passive object. The second one is the concept of mantle cloaking, which is based on a simple impedance surface to achieve similar effects. Now, new research shows that even a single layer of atoms, with the exciting conductivity properties of graphene, may achieve similar functionality in planar and cylindrical geometries. Once realized, this concept represents the 'thinnest' possible cloak, operating in the THz spectrum.
Jun 30th, 2011
Nanoindentation is derived from the classical hardness test but is carried out on a much smaller scale. It can be used to determine the hardness of thin layers as well as material properties such as elasticity, stiffness, plasticity, and tensile strength, or fracture toughness of small objects and microsystems in fields such as biotechnology. These measurements involve applying a small force to a sample using a sharp probe and measuring the resultant penetration depth. The measured value is used to calculate the contact area and hence the particular property of the sample material. Both the method of force application and the geometry of the indentation tip can be adjusted to suit the particular application.
Jun 29th, 2011
Notwithstanding all the buzz about renewable energy sources, the dirty facts are that coal accounts for 41% of electricity production worldwide. Since, realistically, coal will be a mainstay of electricity generation for many years to come, research into more environmentally friendly use of coal energy is picking up steam. One technology for more efficient power production centers around the solid oxide fuel cell (SOFC). Especially gasified carbon fuel cells offer great prospects for the most efficient utilization of a wide variety of carbonaceous solids fuels, including coal, biomass, and municipal solid waste. Researchers have now developed a self-cleaning technique that could allow solid oxide fuel cells to be powered directly by coal gas at operating temperatures as low as 750 degrees Celsius.
Jun 28th, 2011