Showing posts from March, 2012

Gold nanorods reveal tumor extent

Gold nanoparticles Gold nanoparticles are promising molecular imaging agents; and conjugating such particles with cancer-seeking antibodies enables their direct targeting to tumors. The ability to quantitatively and noninvasively detect targeted nanoparticles in vivo could provide a promising cancer diagnostic tool. The method Researchers at the Engineering Faculty of Bar Ilan University in Israel have developed a tumor detection techniques based on diffusion reflectance (DR) measurements of injected gold nanorods (GNRs). The development is an inexpensive and easy-to-use method for analyzing tissue optical parameters by quantitatively measuring the in vivo concentration of GNRs which can indicate tumor size, the larger the GNR concentration the higher the EGFR amount in the cells as the EGFR concentration directly correlates with the carcinoma amount. Technique The DR technique involves measuring the reflected light intensity profile of an irradiated tissue at a range of source-detecto

Graphyne - a novel nanomaterial

Graphene Graphene, a wonder material with unique electronic and mechanical properties was first created in 2004. It could be used in a host of device applications, even rivaling silicon which is used as the electronics material of choice. Graphene has no directional dependence property and is (almost) isotropic in the plane of the material. Graphene's outstanding properties are due to its peculiar double-cone band structure that features, where the conduction and valence bands meet in a single point at the Fermi level. As the bands approach this point in a linear fashion, the effective kinetic energies of the conduction electrons (and holes) become directly proportional to their momentum. The electrons in graphene behave as though they are relativistic particles with no rest mass, and so can whiz through the material at extremely high speeds, a property which is exploited to make transistors that are faster than any that exist today. Graphynes German researchers have conceptualized

Diamond nanorods are the strongest materials

Diamond Diamond is the second most stable form of carbon after graphite. Its hardness and high dispersion of light make it useful for industrial applications and jewelry. It is the hardest known mineral. Diamonds may be strong, but aggregated diamond nanorods called as amorphous fullerene are very strong. Amorphous fullerene has isothermal bulk modulus greater than that of diamond. Diamond nanorods Fabrication of diamond rods can be done by a variety of techniques. The rods can be grown epitaxially from the gas phase under low-pressure conditions on diamond seed crystals wetted with Ni, Fe, or Mn. Single-crystalline diamond nanorods Single-crystalline diamond nanorods can be synthesized by the hydrogen plasma post-treatment of multiwalled carbon nanotubes. The diamond nanorods are identified as having a core-sheath structure with the inner core being diamond crystal and the outer shell being composed of amorphous carbon. Single crystal diamond filaments can also be grown. Aggregated di

Biosensor Market

Biosensor A biosensor is an analytical device for the detection of an analyte that combines a biological component with a physicochemical detector component. It has a sensitive biological element, transducer or the detector element and a reader device with the associated electronics. Few applications are in glucose monitoring in diabetes patients, environmental applications for the detection of pesticides and river water contaminants such as heavy metal ions, remote sensing of airborne bacteria such as in counter-bioterrorist activities, detection of pathogens, determining levels of toxic substances before and after bioremediation, detection and determining of organophosphate, routine analytical measurement of folic acid, biotin, vitamin B12 and pantothenic acid as an alternative to microbiological assay, determination of drug residues in food, such as antibiotics and growth promoters, particularly meat and honey, drug discovery and evaluation of biological activity of new compounds,

Semiconductor-enriched carbon nanotubes

Researchers at the University of California at Berkeley have made high-performance integrated circuits on flexible substrates from thin-film transistors containing semiconductor-enriched carbon nanotubes. Flexible electronics Flexible electronics has made considerable progress in the last few years using various types of semiconductor materials such as organic semiconductors, silicon with a buckling structure, carbon nanotubes, inorganic nanowires and metal oxides. Carbon nanotubes The materials for the flexible circuits should be easy and cheap to process at room temperature and have high charge-carrier mobility. Thin films of carbon nanotubes are found to be ideal in this respect as researchers have already made sophisticated integrated flexible circuits, including flip-flops and decoders, using carbon nanotubes directly grown by chemical vapor deposition. Nanotube thin films Researchers used purified semi conducting-only carbon nanotube ink for fabricating integrated circuits on mec