Netsu Sokutei
Online ISSN : 1884-1899
Print ISSN : 0386-2615
ISSN-L : 0386-2615
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Volume 7, Issue 2
Displaying 1-4 of 4 articles from this issue
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  • Thermodynamic Study on Acetone Solutions of Cellulose Diacetate by Rayleigh Light Scattering
    Hidematsu Suzuki, Kenji Kamide, Yukio Miyazaki
    1980 Volume 7 Issue 2 Pages 37-42
    Published: May 10, 1980
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.7.37
    JOURNAL FREE ACCESS
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    Rayleigh light scattering measurements were carried out on acetone solutions of a cellulose diacetate fraction at five different temperatures ranging from 12.61 to 50.34°C. The second virial coefficient A2 was found to decrease almost linearly with increasing in temperature. After determining the temperature derivative of A2, the enthalpy parameter κ1 and the entropy parameter φ1 were estimated: κ1=-0.108 and φ1=-0.051. The results obtained indicate that (i) the present system is exothermic, (ii) in view of the negative sign both for κ1 and φ1, some specific interaction between solute and solvent is present, and (iii) acetone is a “configurationally” poor solvent, but is nevertheless a “thermally” good solvent for cellulose diacetate. The exothermic nature of the present system was considered from the standpoint of solvation due to hydrogen bonding.
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  • The Heat of Chemisorption of Water on Metal Oxides
    In Connection with the Two-dimensional Condensation of Water
    Tetsuo Morimoto
    1980 Volume 7 Issue 2 Pages 43-49
    Published: May 10, 1980
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.7.43
    JOURNAL FREE ACCESS
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    The adsorption isotherm of water on most metal oxides gives the II type of isotherm according to Brunauer's classification, but on ZnO a jump appears on the adsorption isotherm of water just before the completion of monolayer coverage. This phenomenon has been explained in terms of the two-dimensional condensation of water which appears on surface hydroxyls having a special structure, i. e., closed hydrogen bonding, on well-developed (1010) plane of ZnO.
    The measurement of differential heat of formation of surface hydroxyls shows that it exhibits a distinct maximum near the completion of monolayer coverage due to the additional heat by hydrogen bonding between surface hydroxyls formed; this supports the closed hydrogen bonding structure of surface hydroxyls on ZnO.
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  • Guidance of the thermal analysis for beginners
    (3) Application of DTA and DSC for Metals, Alloys and Inorganic Compounds
    Yasutoshi Saito, Kurima Kobayashi
    1980 Volume 7 Issue 2 Pages 50-60
    Published: May 10, 1980
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.7.50
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  • [title in Japanese]
    R. Tanaka, M. Takenaka
    1980 Volume 7 Issue 2 Pages 62
    Published: May 10, 1980
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.7.62
    JOURNAL FREE ACCESS
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