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 70, Issue 3
Displaying 1-7 of 7 articles from this issue
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  • Chemical Properties of the Flaky Amorphous Copper Alloy Powders
    Yoshio HARAKAWA, Hitoshi YAMAGUCHI, Taizou KAWAMURA, Akihisa INOUE, Ts ...
    1997 Volume 70 Issue 3 Pages 155-162
    Published: March 20, 1997
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.70.155
    JOURNAL FREE ACCESS
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    When Cu-based amorphous alloy and for pure Cu were immersed in 3 wt% NaCl solution, it was found that the Cu elution was greater for the amorphous alloy than for the pure Cu. Then, we prepared coating films containing flaky amorphous Cu powders, pure Cu powders, and Cu2O powders, and immersed in 3 wt% NaC1 solution up to 360 days. The Cu elution from the coating film containing amorphous powders was the greatest of all. It was possible to control the Cu elu tion by changing the composition ratio of the amorphous powders and Cu2O powders in the coating films.
    For antifouling paints, the elution of Cu ion for long period is required. Thus, the flaky amorphous Cu powders can be expected for the use as antifouling pigments.
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  • Surface Characterization of Monodispersed Aluminum (III) Hydrous Oxide Particles and Their Derived Oxides
    Shuichi HAMADA, Yoshiyuki KUDO, Takehiko KINOSHITA, Akihisa KANAYA
    1997 Volume 70 Issue 3 Pages 163-172
    Published: March 20, 1997
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.70.163
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    Uniform spherical particles of amorphous aluminum (III) hydrous oxide, 0.52 μm in average size with a relative standard deviation of 0.08, were produced by aging at 100°C the corresponding acetylacetonato complex solution in the presence of sulfate ions. Aluminum (III) oxide particles were also prepared by calcining the original hydrous oxides at different temperatures. The original particles gave two exothermic peaks at 925 and 1185°C assignable to transitions from amorphous state to γ-and/or θ-alumina, and to α-alumina at the DTA, in addition to an endothermic peak due to dehydration. Shape of the original particles was essentially unchanged by calcination, however, the surface became slightly rough. The point of zero charge (PZC) of the particles were potentiometrically determined at pH 7.6 for the hydrous oxides, and at pH 7.3 and 7.1 for the oxides, respectively. The partition constant, Km ([≡S-OAg] s/ [Ag+]), at the adsorption equilibria of silver (I) ions at pH 6.3 and 25°C smoothly decreased from 3.2 dm3 g-1 of the hydrous oxides down to 0. 21 dm3 g-1 of the oxides as the calcination temperature was elevated. Adsorption of silver (I) ions evidently took place through chemical replacement at OH group sites, not through simple physical adsorption, as judged from such a series of decreases in the Km in spite of a maximum specific surface area of 140 m2 g-1 at a temperature of 600°C.
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  • Nature of the Adsorption of Poly (acrylic acid) and Poly (vinyl pyrrolidone) on Alumina
    Kunio ESUMI, Kenji ISHIDUKI
    1997 Volume 70 Issue 3 Pages 173-178
    Published: March 20, 1997
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.70.173
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    The adsorption isotherm of poly (acrylic acid) (PAA) on α-alumina showed a strong affinity and the adsorbed amount decreased gradually with increasing pH from 5.2 to 10.2, whereas the adsorbed amount of poly (vinyl pyrrolidone) (PVP) was negligibly small over a whole pH region studied. In a simultaneous adsorption of PAA and PVP, the adsorption of PVP was remarkably enhanced due to hydrogen bonding between PAA and PVP at pH of 5.2 and 7.2, but no adsorption was observed at pH 10.2. However, an appreciable amount of PVP was still remained on the alumina by the pH shifting to 10.2 after the polymers adsorption at pH 5.2.
    In addition, the conformation change of the polymers adsorbed using spin-labeled polymers was also evaluated as well as the dispersion stability of alumina suspensions with the polymer adsorption.
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  • Trend of Development in Electrogalvanizied Steel Sheet
    Katsumi KANDA
    1997 Volume 70 Issue 3 Pages 179-187
    Published: March 20, 1997
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.70.179
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  • Fundamental of Dispersion and Its Recent Developments
    Kunio FURUSAWA
    1997 Volume 70 Issue 3 Pages 188-195
    Published: March 20, 1997
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.70.188
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  • Ordered Structure in Colloidal Dispersion
    Tsuneo OKUBO
    1997 Volume 70 Issue 3 Pages 196-204
    Published: March 20, 1997
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.70.196
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    [in Japanese]
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  • News Ink
    Naoki O-HARA
    1997 Volume 70 Issue 3 Pages 205-213
    Published: March 20, 1997
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.70.205
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