Article Title: Preparation of Novel Isotropic Pitch with High Softening Point and Solvent Solubility for Pitch-based Electrospun Carbon Nanofiber
Author(s): Byung-Jun Kim, Hyunsig Kil, Naoki Watanabe, Min-Hyun Seo, Bo-Hye Kim, Kap Seung Yang, Osamu Kato, Jin Miyawaki, Isao Mochida and Seong-Ho Yoon
The novel isotropic pitch that exhibits both high solvent solubility (100% soluble in THF) and a high softening point (over 200°C) was successfully synthesized by the bromination of 2-methylnaphthalene followed by dehydrobromination/polymerization and extraction in n-hexane to eliminate lighter constituents. The molecular structure of the pitch was relatively linear with flexible methylene cross-linkages between naphthalene molecules. During bromination, a reaction temperature of 180°C was necessary to induce bromine substitution of methyl hydrogen. Methylene cross-linkages were formed after the dehydrobromination reaction. The obtained pitch is a suitable precursor for electrospinning and meltspinning to prepare carbon nanofibers and carbon fibers, respectively.
For more details, visit: http://benthamscience.com/journal/abstracts.php?journalID=coc&articleID=111775
Article Title: Production and Purification of Functional Lipids Through Enzymatic and Microorganism-Mediated Processes
Author(s): Toshihiro Nagao, Yomi Watanabe, Hirofumi Nakano and Yuji Shimada
The most remarkable difference between a chemical reaction and a lipase reaction is the fact that lipase possesses several substrate specificities, in particular, fatty acid specificity on hydrolysis, esterification, or transesterification reaction of the ester bond. Several lipases act weakly on polyunsaturated fatty acids (PUFAs) such as docosahexaenoic acid (DHA) and arachidonic acid. Through fatty acid specificity of lipases, a DHA-rich oil (acylglycerols) has been industrially produced from tuna oil. Lipase specificity also facilitates purification of PUFAs, conjugated linoleic acid isomers, tocopherols, and sterol esters and production of triacylglycerol that is DHA– rich at the sn– 1(3) position. Microorganism-mediated processes using Aeromonas hydrophila N– 6 are effective for production of rare unsaturated fatty acids and rare unsaturated fatty alcohols from several vegetable oils. These lipids are rarely observed in natural oils. We also demonstrate that Acinetobacter sp. N– 476– 2 effectively converts functional arachidonic acid to functional arachidonyl alcohol, which can be used as a substrate for medicine.
For more details, visit: http://benthamscience.com/journal/abstracts.php?journalID=coc&articleID=108952
Article Title: Selective Photocatalytic Oxidation Of Benzyl Amine By O2 Into N-Benzylidenebenzylamine on Tio2 Using Visible Light
Author(s): Shinya Higashimoto, Yoshiaki Hatada, Ryo Ishikawa, Masashi Azuma, Yoshihisa Sakata and Hisayoshi Kobayashi