Papers – Page 799 – TechConnect Briefs

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 [...]

Silver Nanoparticles for the Simultaneous Raman Detection of Anions, Cations and Neutral Molecules

Sirimuthu N.M.S., Bell S.E.J., Innovative Molecular Materials Group,Queen’s University, UK

Citrate-reduced silver colloids are used extensively for SERS (surface-enhanced Raman spectroscopy) detection of low concentrations of cations but are typically ineffective for detection of anions, since the metal surface bears a negatively charged citrate layer. [...]

Electric Field Assisted Assembly of Functionalized Quantum Dots into Multiple Layer Thin Films

Dehlinger D.A., Sullivan B.D., Esener S., Heller M.J., University of California San Diego, US

Electric Field Assisted Self-Assembly of Functionalized Nanoparticles into Multiple Layer Thin Films Michael J. Heller, Benjamin Sullivan and Dietrich Dehlinger Departments Bioengineering and Electrical and Computer Engineering University California San Diego La Jolla, CA 92093 Reconfigurable [...]

Cubic or monoclinic Y2O3:Eu3+ nanoparticles by flame spray pyrolysis

Camenzind A., Strobel R., Pratsinis S.E., ETH Zürich, CH

Continuous, single-step synthesis of cubic monocrystalline Y2O3:Eu3+ nanophosphor particles (10 -20 nm in grain diameter) is achieved by flame spray pyrolysis (FSP). The effect of FSP process parameters on product particle characteristics was investigated by [...]

Particle Characterization of Nanoscale Materials using Dynamic and Static Light Scattering

Bumiller M., DeLuca T., Mattison K., Rawle A., Malvern Instruments, Inc., US

Purpose: Novel materials with single particle dimensions at the nano scale are submitted to our laboratory on a regular basis. These samples include single walled nanotubes (SWNT), buckyballs, quantum dots and various metal oxides. Determining [...]

Destruction of Organophosphate Agents by Recyclable Catalytic Magnetic Nanoparticles

Bromberg L., Hatton T.A., Massachusetts Institute of Technology, US

Organophosphorus pesticides and warfare agents are not readily hydrolyzed in aqueous media without applying extremes of pH, heat, or bleach. We show that suspensions of magnetite (Fe3O4) nanoparticles modified with a common antidote, 2-pralidoxime (PAM), [...]

Thermostability of TiO2 nanoparticle and its Photocatalytic Reactivity at Different Anatase/Rutile Ratio

Tseng Y-H, Lin H-Y, Kuo C-S, Li Y.Y., Lin H-Y, Huang C.P., Industrial Technology Research Institute, TW

Thermostability study of commercial P25 TiO2 nanoparticles was carried out by ascending annealing temperature from 400 to 1100 oC. The thermostability of TiO2 structure was measured by X-ray diffraction (XRD). Anatase-Rutile phase transition occurred only [...]