Journal of the Japan Society of Colour Material
Online ISSN : 1883-2199
Print ISSN : 0010-180X
ISSN-L : 0010-180X
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Volume 62, Issue 8
Displaying 1-4 of 4 articles from this issue
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  • Synthesis and Application of Zinc Oxide Modified with Chiral Amino Acids
    Takeshi NINOI, Masakuni YOSHIHARA, Seisirô ITÔ, Masayuki F ...
    1989 Volume 62 Issue 8 Pages 459-465
    Published: August 20, 1989
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.62.459
    JOURNAL FREE ACCESS
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    The zinc oxide powders modified with amino acids were synthesized by dry grinding of zinc oxide and amino acids in a ball mill. It was found that amino acid was introduced as an ammonium salt and a carboxyl anion in the active site appeared on a broken face of zinc oxide. Utility of the powders to some organic reactions was examined. First, the powders were allowed to react with activated amino acid esters in benzene to exhibit that they selectively adsorb either of racemic esters. And when this reaction was done in mathanol, the powders were found to have catalytic activity and to cause stereoselective methanolysis. Then, the optical resolution of α-phenethyl alcohol with the powders in methanol was tried. Optically active α-phenethyl alcohol was recovered and the ratio of reaction rate of each enantiomer, KS/KR, was determined to be Max. 2.63.
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  • Comparison of ASTM/EPA and Bubbling Methods for the Determination of Tributyltin Leaching Rate
    Kazunobu TAKAHASHI, Hideki IKUTA
    1989 Volume 62 Issue 8 Pages 466-473
    Published: August 20, 1989
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.62.466
    JOURNAL FREE ACCESS
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    Two kinds of leaching tests, i. e. ASTM/EPA and bubbling methods, were compared each other for the determination of tributyltin (TBT) leaching rate from self-polishing antifouling paint. Tributyltin compounds as their chloride were extracted into hexane and hydrogenated to tributyltin hydride (TBTH) by sodium borohydride, afterwards analyzed by gas chromatography with an electron-capture detecton (ECD-GC). Synthetic seawater (pH=8.2) obtained by ASTM D-1141 was used as the leaching solutions. ASTM/EPA method : Antifouling paint film of a mininum 100μm thickness was applied to the surface of polycarbonate cylinder closed at one end. This cylinder was immersed in a large polycarbonate bath (2l) holding synthetic seawater and rotated about 60±10 rpm. Bubbling method : FRP plate panel (2×70×150mm) was painted on both side. The leaching bath was stirred by a stream of air bubbles (about 200ml/min) at 25°C. As the results, it was found that TBT leaching rate from antifouling paints by means of ASTM/EPA method were 1.3-1.5 times higher than those by means of bubbling method and TBT leaching rate from antifouling paints at steady state were obtained to be 1-3 μg/cm2/day.
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  • Interfacial Control with Lecithins
    Minoru NAGAKURA
    1989 Volume 62 Issue 8 Pages 474-486
    Published: August 20, 1989
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.62.474
    JOURNAL FREE ACCESS
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  • Skin Care Products and the Skin
    Shoji NISHIYAMA, Yoshimaru KUMANO
    1989 Volume 62 Issue 8 Pages 487-496
    Published: August 20, 1989
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.62.487
    JOURNAL FREE ACCESS
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