Advanced Materials & Manufacturing – Page 531

Static dielectric constant of SiO2 embedded with silicon nanocrystals

Ng C.Y., Yang M., Wong J.I., Chen T.P., Nanyang Technological University, SG

The static dielectric constant of isolated silicon nanocrystal (nc-Si) embedded in a SiO2 thin film synthesized by Si+ implantation has been determined from capacitance measurement based on the Maxwell-Garnett effective medium approximation and the Stopping [...]

Structural and Magnetic Properties study of CoFe2O4 Nanopowder prepared by Mechanical Milling using metallic Cobalt and Hematite powder Blend

Beitollahi A., Sani R., Maksimov Yu.V., Suzdalev I.P., Iran University of Science and Technology (IUST), IR

In this work we report the phase formation and magnetic properties of CoFe2O4 nanopowder prepared by mechanical alloying technique using metallic cobalt and hematite powder (1:1 molar ratio) as the initial raw material in ambient [...]

Mechanochemical dry synthesis of nanocrystalline semiconductors

Balaz P., Godocikova E., Izdinsky K., Kovac J., Satka A., Achimovicova M., Institute of Geotechnics of Slovak Academy of Sciences, SK

In recent years semiconductor nanocrystals (QD) have attracted much attention due to their great potential in technological applications. Electronic, optical and other properties of QD with respect to corresponding bulk materials are modified considerably, offering [...]

Surface Plasmon Resonances of Metal Polyhedral Nanoparticles

González A.L., Noguez C., UNAM, MX

In this work, we show that it is possible to elucidate among different polyhedral shapes of silver nanoparticles of less than 10 nm, by studying their surface plasmon resonances. When a particle is excited by [...]

NanoActive Metal Oxides: Unique Materials with Unlimited Potential

Koper O.B., Rajagopalan S., NanoScale Materials, Inc., US

NanoActive materials are novel forms of metal oxides that possess extremely high surface areas (100-700 m2/g), defect-rich morphology (many corner and edge sites), large porosities (up to 1 cc/g), and small crystallite sizes (2-10 nm). [...]

Tailoring FePt-Fe3O4 exchange spring coupling magnet in silica

Yu C.H., Lo C.C.H., Tam K.Y., Tsang S.C., University of Reading, UK

We report the optimization of exchange spring coupling ofFePt/Fe3Pt nanocomposites via independently tuning their size and composition by a micro-emulsion method. These nanocomposites are deliberately placed in each silicanano-spheres such that the problem of their [...]

Enhancement of Oxygen Transfer in Fermentation by Use of Functionalized Magnetic Nanoparticles

Olle B., Bromberg L., Hatton T.A., Wang D.I.C., Massachusetts Institute of Technology, US

Maintaining an adequate oxygen supply to aerobic cell cultures has been a long-standing problem in fermentation technology. Insufficient oxygen transfer rates limit cell growth and ultimately process productivity. Our approach to reducing the oxygen transport [...]

Hydroxyapatite Nanoparticle Synthesis and In-Vitro Study of Dentinal Tubule Occlusion

Earl J., Wood D., Milne S.J., University of Leeds, UK

Dental hypersensitivity is a problem for large sectors of the population. The problem is caused by the movement of fluid within tiny channels, called tubules, which radiate from the pulp to the surface of the [...]

Recoverable and Recyclable Catalysts for Multi-Step Reaction Networks

Gill C.S., Phan N.T.S., Zhang Z.J., Jones C.W., Georgia Institute of Technology, US

Cascade reactions involve multiple catalysts promoting multiple reactions in a single vessel. However, these one-pot reactions generally yield a mixture of non-separable catalysts. Our research demonstrates a new approach in chemical catalysis through the use [...]

Formation of Ceramic Nanopowders and Composites in a Self-Sustaining Reaction Regime

Puszynski J.A., Khachatryan H.L., Maukyan K.V., Kharatyan S.L., South Dakota School of Mines and Technology, US

A combustion synthesis, also called self-propagating high-temperature synthesis, has been found to be an effective and economical production method of advanced ceramic and intermetallic compounds. This method is very suitable for the formation of nonstoichiometric [...]