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CTT-other mat stories

Published on September 3rd, 2013 | By: Jim Destefani

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Other materials stories that may be of interest

Published on September 3rd, 2013 | By: Jim Destefani

CTT-other mat stories

 

Oxygen ‘sponge’ may lead to improved catalysts, energy materials

Scientists at the US Department of Energy’s Oak Ridge National Laboratory, Oak Ridge, Tenn., have developed a material that can easily absorb or shed oxygen atoms at low temperatures, making it useful in devices such as rechargeable batteries, sensors, gas converters and fuel cells. Many energy storage and sensor devices rely on catalyzed reduction-oxidation reactions, and the oxygen “sponge” material would trigger the reactions at lower temperatures without platinum or other precious metal catalysts, researchers say. The material consists of strontium cobaltite, which is known to occur in a preferred crystalline form called brownmillerite. The ORNL-led team synthesized the material in a perovskite crystal structure.

 

Optical tool provides graphene quality control

 A research team from England’s National Physical Laboratory and Sweden’s Chalmers University of Technology and Linköping have developed a fast and inexpensive tool for quality control of graphene grown on silicon carbide. Published in Nano Letters, the technique is based on optical microscopy and can be used to understand the effect of the silicon carbide substrate on graphene quality. It involves analyzing optical images and comparing them to electrical measurements to identify single graphene layers only 0.3 nanometers thick. The researchers used the procedure to build and locate graphene devices on specific parts of a silicon carbide substrate, and were able to identify single layers of graphene and visualize features such as stepped terraces on the silicon carbide substrate and areas of multilayer graphene. They then tested the electrical characteristics of the devices built on each area to confirm the ability of optical microscopy to detect areas of different topography and layer coverage of the graphene.

 

New building material: Reconstituted cellulose, water

An Australian company is using a patented process to produce building materials it says consist of nothing more than reconstituted cellulose and water. Zeoform (the company) says its Zeoform (material) is derived from multiple hydroxyl groups on glucose chains that bond with oxygen atoms on neighboring chains, holding the chains firmly together and forming microfibrils with high tensile strength. The microfibrils are meshed into a carbohydrate matrix, resulting in a molding material that sets as strong as ebony. The company’s cellulose is primarily obtained from wood pulp and cotton, making Zeoform a sustainable technology. The material can be sprayed, poured, molded, pressed or shaped into a variety of geometries, then colored, stained, or blended with organic, metallic, pigment, or conductive substrates, according to the company. Surface and texture can be formed to create unique aesthetics and provide additional specific functional properties.

 

Nanostructures produced by dealloying may advance energy devices

New types of nanostructures produced by dealloying lithium-tin materials have shown promise for applications in batteries and other electrochemically powered energy devices and systems, according to scientists at Arizona State University, Tempe. Nanoporous materials made by dealloying consist of nanometer-scale porosity and metal, and have found application in catalysts, actuators, and supercapacitors. They could also improve the performance of electrochemical sensing technology and provide more resilient radiation damage-resistant materials, the researchers say. With further development, they could also provide lithium-ion batteries with improved energy-storage capacity and faster charge/discharge cycles.

 

Iron oxide nanoparticles could indicate heart attack risk

 A Binghamton University (N.Y.) researcher hopes to give doctors a more accurate way of determining a patient’s risk of heart attack or stroke using a combination of polymers and superparamagnetic iron oxide nanoparticles. The nanoparticles are sensitive to oxidative stress, which occurs in atherosclerosis and has been linked to patients who have a higher prevalence of heart attack and stroke. Combined with magnetic resonance imaging, they may give doctors an indication of the stability of plaque clogging a patient’s coronary arteries. Most heart attacks do not occur from a full arterial blockage by plaque; rather, they happen because the plaque bursts. Thus discovery of a particle that indicates the safety of plaque would be a breakthrough, the scientist says.


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One Response to Other materials stories that may be of interest

  1. Vulvox’ research and development program leads to finding structural applications for our graphene ultrahigh strength materials. We plan on manufacturing ultra high strength graphene blocks, rods and machined objects and also aligned carbon nanotube films for ballistic armor and other applications. Graphene paper might replace carbon fiber composites in the next generation of ultralight wind turbines. We currently have an R&D materials transfer, characterization, and materials processing agreement with one of the biggest graphite materials manufacturers in the world and we are seeking other corporate R&D partners and university R&D labs that will jointly apply for STTR funds for our project. Contact info below;

    Vulvox has begun experiments on new ways to synthesize graphene solid materials in bulk. It is one of the strongest lightweight materials known to science, but currently it is a laboratory curiosity. We are exploring the prospects of an R&D partnership with MZH Composites LLC which has given us a letter of intent to jointly research aligned carbon nanotube films for ballistic armor.

    CARBON NANOTUBE ADHESIVE- Our second round of experiments has resulted in a simpler, less expensive process for manufacturing the nanotube adhesive and a stronger material that will be more versatile in the applications detailed on our website in the press release and our page on medical applications. Our process will be much less costly than the carbon nanotube adhesive processes publicized by the Ajayan group at Rensselaer and it is much easier to scale up.

    Vulvox is researching heat exchange materials that transfer heat between hot and cold environments. They show very high heat transfer characteristics in experiments and can be manufactured from materials that can be scaled up and it is possible we can take advantage of economies of scale. They transfer heat much faster than stainless steel and they are much lighter than metallic materials. They will be applied in breakthrough products such as geothermal pumps, solar thermal energy collectors, and industrial heat exchangers with much higher efficiencies. They will be products that will increase industrial efficiency and that will pay for themselves even in a recessionary era. We have recently discovered that the material shown above has the porosity and refractory characteristics necessary for filtering molten metals and we plan to apply for patents in the near future. These filters will remove impurities from molten metal streams that react with molds, enabling reduced mold and die wear. In the case of cast aluminum parts, inclusions in the metal can be eliminated resulting in metal part strength increases of 1/5 and reduction of the rejected part rate to zero. We are also performing research on metal matrix composites that will be detailed on our website in the upcoming months. We have obtained encouraging results from our powder metal composite experiments.

    Contact

    Neil Farbstein

    President

    Vulvox Nanobiotechnology Corporation

    http://vulvox.tripod.com/id10.html

    vnbcinc@gmail.com

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