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 55, Issue 3
Displaying 1-7 of 7 articles from this issue
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  • The Effect of pH of Hydrothermal Treatmet of Hydrogel for the Structure of Surface and Pore of Silica Gel
    A New Type of Surface Silanol Groups
    Seiichi KONDO, Yasuro SAITO
    1982 Volume 55 Issue 3 Pages 131-135
    Published: March 20, 1982
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.55.131
    JOURNAL FREE ACCESS
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    The pore and surface structures are studied on silica gels made by the hydrolysis of tetraethoxy silicic acid and by hydrothermal aging of hydrogel thus made at 100°C for 2 hr and at various pH. The materials thus obtained have the BET N2 surface area (SN2) of about 800 m2/g at low pH 900 m2/g at neutral pH and 130 m2/g at pH 11. 2. The density of surface OH groups (N0H/nm2) shows rather.complicated change such as 8, 5 and 18 at low, neutral and high pH, respectively. The infrared spectroscopy gives the species and relative concentration of those hydroxyl groups as follows. At low pH, where the gel is of micropore type, (Hydrogen-bonded OH between the primary silica particles) > (Free OH) >> (Inner OH). At neutral pH, where the gel is of mesopore type, (Free OH), (H-bonded OH between particles) ≅ (Inner OH). At high pH which makes macropore type gels, (Inner OH) ≅ (New type OH) >> (Free OH). The free, H-bonded and inner OH are similar to those found before. The newly found OH groups have the IR absorption maxima at 3,500cm-1 dehydrate in vacuo at 400°C and rehydrate to the former OH very easily. SN2, treated at 400°C is the same with that without heat treatment. The initial monolayer heat of adsorption of water to this material is about half of the heat of condensation of water. These facts suggest that the new type of OH groups found in this study are on the bare surface of silica and are much weaker adsorption sites for water.
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  • The Particle Size Control of the Spherulite of Calcium Sulfite Hemihydrate and its Internal Structure
    Takashi MATSUNO, Masumi KOISHI
    1982 Volume 55 Issue 3 Pages 136-144
    Published: March 20, 1982
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.55.136
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    It has been demonstrated that addition of small amounts of divalent metal ions (4.0×10-4-2.0×10-3 M) to a reaction system (0-40°C) of a calcium hydroxide suspension (0.4 M) and sulfur dioxide (50 vol %) lead to a formation of the spherulites of calcium sulfite hemihydrate (particle diameter : 2-18 μm). The concentration of metal ions to make spherulite formation ratio of hemihydrate maximum were different each other. When the reactions were carried out at 5°C, the bulk of the products is formed as the spherulites of calcium sulfite hemihydrate by adding each copper (II) ion, zinc (II) ion and nickel (II) ion in the concentrations of 4.0×10-4 M, 1.0×10-3 M and 2.0×10-3 M, respectively. When the reactions were carried out at 5°C, the size of spherulites increased from 5.94 μm to 7.78 μm with increasing the concentration of copper (II) ion in the range of molar concentration from 1.0×10-4 M to 5.0×10-3 M. When the reactions were carried out adding copper (II) ion of 4.0×10-4 M, the reaction temperature had no influence on the spherulite formation ratio in the range of 0-30°C, but in the higher temperature range, increasing temperature tended to decrease the spherulite formation ratio. At 50°C, the bulk of the product is formed as the formless masses of calcium sulfite hemihydrate. In the reaction system containing 4.0×10-4 M copper sulfate, the size of spherulites increased from 7.07 μm to 11.5 μm with increasing the temperature in the range of 5-30°C. It was revealed that the spherulite of hemihydrate had the internal structure consist of a large number of platy and columnar crystals which arranged radially and densely from the center by scanning electron microscopic observation of its artificial broken cross section. Further, the adsorption phenomenon of metal ions and (or) metal compounds to the spherulite was also considered on the basis of the XMA analyses.
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  • Application of Castor Oil for Coating Industry
    Chozo YAMAGUCHI
    1982 Volume 55 Issue 3 Pages 145-153
    Published: March 20, 1982
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.55.145
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  • The Utilization of Tall Oil for Colour Material
    Masahisa ISHIGAMI
    1982 Volume 55 Issue 3 Pages 154-164
    Published: March 20, 1982
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.55.154
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  • Compatible Polymer Mixtures and Their Methods of Experimental Determination
    Saburo AKIYAMA
    1982 Volume 55 Issue 3 Pages 165-175
    Published: March 20, 1982
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.55.165
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  • Printing & Recording Technology in Future
    Kvoichiro AZAMI
    1982 Volume 55 Issue 3 Pages 176-187
    Published: March 20, 1982
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.55.176
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  • Electrochemical Measurement on Corrosion Phenomena at Coated Metal
    Takashi YAMAMOTO
    1982 Volume 55 Issue 3 Pages 188-199
    Published: March 20, 1982
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.55.188
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