The TMR ratio in MTJs with

Co2FeSi electrode is smaller than that of a MTJ with Co2MnSi electrode. Tunnel conductance characteristics were investigated, revealing no half-metallic character in MTJs with Co2FeSi electrode in the conductance-voltage curves. (C) 2009 American Institute of Physics. [DOI: 10.1063/1.3062814]“
“BACKGROUNDArabitol has many potential industrial applications and it can be produced by fermentation click here from glycerol, a major byproduct of biodiesel industry. This work aims at developing a new process for collecting and purifying arabitol from the broth of osmophilic Debaryomyces hansenii containing arabitol, unconsumed glycerol, and other minor impurities. RESULTS: The process developed and optimized in this study had the following steps: first, the broth supernatant was treated with 8gL(-1) activated carbon at 30 degrees C and pH 6 for removal of colored organics and some impurities. Then glycerol was selectively removed by acetone extraction at 30 degrees C. The acetone amount was optimized according to the measured solubility data of simulative glycerol-xylitol-acetone systems and real fermentation broth. The glycerol-removed CBL0137 remainder was next extracted for arabitol with butanol (90% of supernatant volume) at 90 degrees C. White arabitol crystals were collected from the cooled butanol extract. The overall recovery

and purity of arabitol crystals were 66% and 95%, respectively.

CONCLUSIONSuccessful arabitol purification was achieved with an optimized process. Fundamental phase equilibrium data of glycerol-xylitol-acetone systems were obtained. The process developed would prove valuable for arabitol production and potentially

for separation of other polyols. (c) 2012 Society of Chemical Industry”
“Applications of elemental cobalt are consequence of its phase-dependent magnetic properties; the Stem Cell Compound Library supplier anisotropic high-coercivity hcp-Co phase is preferred for permanent magnet applications, while the more symmetric low coercivity fcc- and pseudocubic epsilon-Co can be used in soft magnetic applications involving power electronics and magnetic write heads. The present work addresses the synthesis and characterization of nanocrystalline cobalt particles produced through a modified polyol-based approach conducive to the formation of fcc-, hcp-, or epsilon-Co phases. Metastable epsilon-Co and hcp-Co were exclusively formed in the presence of trimethylene glycol. In turn, fcc-Co or mixture of fcc/hcp-Co phases were produced in tetraethylene glycol. The average crystallite size in all cases ranged between 10 and 13 nm. Magnetic measurements confirmed the strong influence of synthesis conditions on crystal structure and hence on magnetic properties of nanocrystalline cobalt. The coercivity of the products varied from 338 to 550 Oe depending on the presence of the different cobalt structures. (C) 2009 American Institute of Physics. [DOI: 10.1063/1.