Journal of the Japan Society of Colour Material
Online ISSN : 1883-2199
Print ISSN : 0010-180X
ISSN-L : 0010-180X
Volume 73, Issue 6
Displaying 1-7 of 7 articles from this issue
  • Kumiko KUDO, Yuji SAKAI, Hideki SAKAI, Makio IWAHASHI, Keiji KAMOGAWA, ...
    2000 Volume 73 Issue 6 Pages 275-281
    Published: June 20, 2000
    Released on J-STAGE: November 20, 2012
    JOURNAL FREE ACCESS
    The effect of oil components on the lowering of oil/water interfacial tension in the presence of nonionic surfactants (polyoxyethylene (n) oleylether, n = 10, 20) was investigated. The oil/water interfacial tension was strongly dependent on the combination of two oils. The combination of nonpolar squalane and polar oleic acid gave the minimum interfacial tension, resulting in the spontaneous emulsification in the vicinity of the oil/water interface. Near-infrared spectroscopy revealed that the concentration of oleic acid monomer in the oil mixture with squalane was higher than that in the mixture with other oils such as methyl oleate at lower oleic acid fractions. Thus, reduction of interfacial tension between oleic acid-squalane mixed oil and water was considered to be due to the effective orientation of oleic acid monomer at the oil/water interface.
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  • M. MONSADA Araceli, Yukihiro SEKIYAMA, Makoto YUASA, Isao SEKINE
    2000 Volume 73 Issue 6 Pages 282-289
    Published: June 20, 2000
    Released on J-STAGE: November 20, 2012
    JOURNAL FREE ACCESS
    The corrosion protection ability and degradation behavior of various organic coatings in aqueous solutions were investigated by electrochemical parameters, specifically coating film resistance (Rf) determined by electrochemical impedance spectroscopy (EIS) and current density (i) determined by scanning vibrating electrode technique (SVET). Clear paints of epoxy (EP) and polyester (PES) were used in this study. These paints were applied on mild steel substrates at different coating film thicknesses, as follows : 20, 60,100 and 150 μm. Paint coated steel samples were immersed in aqueous 3% sodium chloride (NaC1) and 100 ppm NaC1 solutions for EIS and SVET measurements, respectively. Results of experiments showed that Rfgenerally decreases with increasing immersion time for all coating thicknesses. The upper limits of Rf were increased higher with increasing coating thickness for both EP and PES coated steels. Moreover, the rate of deterioration of Rf of coating decreased with increasing coating film thickness. EP-based clear coating was observed to have the superior protection ability in both immersing solutions. A good correlation between coating film thickness and protection ability of coatings to steel substrate was practically observed by EIS and SVET measurements.
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  • Kunio ESUMI, Noriyuki FUJIMOTO, Kanjiro TORIGOE, Yoshifumi KOIDE
    2000 Volume 73 Issue 6 Pages 290-295
    Published: June 20, 2000
    Released on J-STAGE: November 20, 2012
    JOURNAL FREE ACCESS
    Adsorption of poly (amidoamine) dendrimer with surface amino groups and cationic surfactants on silica was studied at pH5. Two dendrimers used were generations of zero and five (G0 and G5). Two cationic surfactants were dodecyltrimethylammonium bromide (DTAB) and 1, 2-bis (dodecyldimethylammonio) ethane dibromide (2RenQ). Adsorption of the dendrimers of GO and G5 increased linearly with the dendrimer concentration, while typical adsorption isotherms were obtained for DTAB and 2RenQ. The adsorption of the dendrimers increased the ζpotential of silica from negative to positive. In a simultaneous adsorption of the dendrimer and cationic surfactant at a fixed concentration of the dendrimer, a competitive adsorption between the dendrimer and surfactant was observed, with the G5 competing more strongly than the GO with the surfactant. Further, a comparison between the two surfactants showed that DTAB is more easily replaced than 2RenQ by the adsorption of the dendrimer. These results demonstrated that the simultaneous adsorption of the dendrimer and cationic surfactant on silica is considerably affected by the generation number of the dendrimer and the structure of surfactant. In addition, a simultaneous adsorption behavior of poly (ethyleneimine) and cationic surfactant on silica was very similar to that of the dendrimer and cationic surfactant.
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  • “Pompeian Red” of “Villa dei Misteri” in Pompei
    Eiichi TSURUTA
    2000 Volume 73 Issue 6 Pages 296-303
    Published: June 20, 2000
    Released on J-STAGE: November 20, 2012
    JOURNAL FREE ACCESS
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  • Mitsuhiro SHIBATA
    2000 Volume 73 Issue 6 Pages 304-307
    Published: June 20, 2000
    Released on J-STAGE: November 20, 2012
    JOURNAL FREE ACCESS
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  • Shin'ichi MAGAINO
    2000 Volume 73 Issue 6 Pages 308-311
    Published: June 20, 2000
    Released on J-STAGE: November 20, 2012
    JOURNAL FREE ACCESS
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  • Makoto TANAKA
    2000 Volume 73 Issue 6 Pages 312-316
    Published: June 20, 2000
    Released on J-STAGE: November 20, 2012
    JOURNAL FREE ACCESS
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