TANSO
Online ISSN : 1884-5495
Print ISSN : 0371-5345
ISSN-L : 0371-5345
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Volume 1973, Issue 72
Displaying 1-7 of 7 articles from this issue
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  • Shapes of Meso-Carbon Microbeads
    Hidemasa HONDA, Yasuhiro YAMADA, Shoiti OI, Kenji FUKUDA
    1973 Volume 1973 Issue 72 Pages 3-7
    Published: February 15, 1973
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.7209/tanso.1973.3
    JOURNAL FREE ACCESS
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    Quinoline-soluble coal-tar pitch, coal-tar pitch containing 3.4% free-carbon (quinolineinsoluble particles) and petroleum asphalt containing 5.4% sulphur were heat-treated for 120 min., 90 min. and 60 min. at 430°C respectively. Formation of mesophase spherules was observed by using a polarized-light microscope.
    The mesophase spherules were separated by solvent extraction from heat-treated pitches. The separated mesophase spherules were named meso-carbon microbeads and classified into type C, type M and type P according to above mentioned raw pitches. The shapes of meso-carbon microbeads were studied with a scanning electron microscope.
    The shapes of type C and type P can be divided into two classes, that is, the shapes of meso-carbon microbeads having larger size than about 5μm are approximately true spheres and those having smaller size than about 3μm are lemon-like spheroid. It is not obvious that the meso-carbon microbeads showing lemon-like shapes have the same lamellae structure as those larger than about 5μm, because the sensitive-tint technique can not be used for the meso-carbon microbeads smaller than about 3μm according to the resolving power of optical microscope.
    The shapes of type M are irregular, although their sizes are almost the same, and the free-carbon smaller than about 1μm are retained over the surface of mesophase.
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  • Electron Spin Resonance of Carbon Films Prepared from Graphite Oxide (I) A Graphitized Carbon Film
    Sadaharu TOYODA, Toshio YAMAKAWA, Yoshio YAMADA, Kazuo KOBAYASHI
    1973 Volume 1973 Issue 72 Pages 8-13
    Published: February 15, 1973
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.7209/tanso.1973.8
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    As part of a fundamental study on structure and properties of carbon films obtained by reduction of graphite oxide, prepared from natural graphite powder by Staudenmaier's method, an ESR measurement was carried out for the graphitized carbon film heat treated up to 2800°C.
    A single broad line with about 10 gauss peak-to-peak line width, was observed when the plane of the film was parallel to the magnetic field. The absorption line, being symmetrical and approximately Lorentzian in shape, becomes broader both when an angle between the plane of film and the magnetic field increases and when the temperature is lowered.
    As a result of the temperature dependence of the absorption intensity estimated by integrating graphically, it is reasonably concluded that no localized spin center presents in the graphitized carbon film. The three dimensional diffraction line (112) was observed in an X-ray diffraction study. Therefore, the g-value anisotropy seems to be found in the graphitized carbon film.
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  • A D. T. A. Study on the Oxidation of Carbon and Graphite
    Toshio HONDA, Tamotsu SAITO, Yoji HORIGUCHI
    1973 Volume 1973 Issue 72 Pages 14-20
    Published: February 15, 1973
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.7209/tanso.1973.14
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    The change of D. T. A. curve for carbon and graphite under air oxidation was studied by micro differential thermal analysis (D. T. A.) method.
    By analysing the peak position, it was found that the temperature of the peak maximum (Tm) represents some intrinsic carbon properties: The Tm value seemed to correspond to its reactivity for oxidation, and a certain relation was observed with crystallite size Lc(002) and lattice spacing Co.
    The D. T. A. curve for reactor grade graphite showed a single exothermic peak. In case of binary mixture of two types of carbon, some shifts of the peak positions in the D. T. A. curve was observed.
    The peak shape and peak position for carbonized furfural-resin was found to vary remarkably with heat-treatment temperature. For the 2460°C H. T. T. sample, two sharp peaks was observed in x-ray diffraction profile and also in the D. T. A. curve under air oxidation. It was suggested that the 2460°C H. T. T. may be constituted of at least two kinds of carbons which had different oxidation reactivities.
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  • The Formation of Shrinkage Cracks in Heat-Treated Meso-Carbon Microbeads
    Yasuhiro YAMADA, Hidemasa HONDA
    1973 Volume 1973 Issue 72 Pages 21-23
    Published: February 15, 1973
    Released on J-STAGE: March 01, 2011
    DOIhttps://doi.org/10.7209/tanso.1973.21
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  • Change of Electrical Resistivity of Graphite-Bromine Lamellar Compound with Temperature
    Tadashi SASA, Yoichi TAKAHASHI
    1973 Volume 1973 Issue 72 Pages 23-24
    Published: February 15, 1973
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.7209/tanso.1973.23
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  • Manufacture of Hollow Carbon Sphere
    Kazuo KOBAYASHI, Minoru SHIRAISHI, Kenichi SUZUKI
    1973 Volume 1973 Issue 72 Pages 24-27
    Published: February 15, 1973
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.7209/tanso.1973.24
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  • [title in Japanese]
    [in Japanese]
    1973 Volume 1973 Issue 72 Pages 28-39
    Published: February 15, 1973
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.7209/tanso.1973.28
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