TANSO
Online ISSN : 1884-5495
Print ISSN : 0371-5345
ISSN-L : 0371-5345
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Volume 2000, Issue 192
Displaying 1-10 of 10 articles from this issue
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  • Observation of Formation and Coalescence of Mesophase Spheres by Ultrasonic Method
    Yoshiteru Nakagawa, Juji Mondori, Chiharu Yamaguchi, Akira Tanaka, Min ...
    2000 Volume 2000 Issue 192 Pages 113-118
    Published: May 15, 2000
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.7209/tanso.2000.113
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    The authors introduced an ultrasonic technique as a method to investigate the process and/or rate of growing and developing of mesophase with heating. Two kinds of pitches were chosen for this purpose i.e., synthetic naphthalene pitch (MC) and hydrogenated coal-tar pitch (HC). In addition, solvent extraction analysis, polarizing optical microscope observation and rheological data were also used to help understand the ultrasonic data. For pitches of MC and HC, two peaks on the curve of the attenuation coefficient related to appearance and development of mesophase were observed against heating time at 330°C and 380°C, respectively. Thus, it was found that the investigation of pitches by means of their ultrasonic observation leads to a good description of appearance and development of mesophase during heating treatment. Consequently, it is expected that the ultrasonic method will be useful in examining the in situ observation for appearance and development of meso-carbon microbeads.
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  • Surface Modification of PVC Derived Carbon by Cold CF4 Plasma Processing and Its Characterization
    Xu Li, Kiyoshi Horita
    2000 Volume 2000 Issue 192 Pages 119-124
    Published: May 15, 2000
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.7209/tanso.2000.119
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    The authors have investigated the surface properties which are electric conductivity, wettability, the rate constant of H2O2 decomposition, and surface functional groups of surface modified poly (vinyl chloride) carbon (PVCC) by cold CF4 plasma. This paper also describes the relations between the surface properties and the electrochemical behavior in an aqueous KOH solution of the gas diffusion electrodes with the plasma processed PVCC. The results are as follows: i) The conductivity of PVCC decreased with processing time. ii) The PVCC surface changed from hydrophilic to hydrophobic. iii) The PVCC with high H2O2 decomposition ability was obtained by the plasma processing. These facts would be explained by the increase of fluorine-containing functional groups on PVCC surface. The polarization and discharge characteristics of oxygen electrode with PVCC were much improved by the plasma processing. These can be explained by the formation of the stable three phase zone owing to moderate water repellency, the high H2O2 decomposition ability, and the developed fine pore structure of the plasma modified PVCC electrode.
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  • Estimation Method of Interatomic Distance Distribution in Carbon Layer Plane
    Hiroyuki Fujimoto
    2000 Volume 2000 Issue 192 Pages 125-129
    Published: May 15, 2000
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.7209/tanso.2000.125
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    The interatomic distances and their numbers were computed using the model of benzen, coronene-based carbon layer planes, and then, were inductively analyzed. As a result, it was found that they are expressed as a function of the lattice constant, α0 and several integers. Thus obtained results make it easy tocalculatethe scattering intensity of carbon based on Debye's or Warren-Bodenstein's equations.
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  • Carbon Rod for Fullerene Synthesis
    Toshiaki Sogabe, Hiroshi Ohkubo, Shigeyuki Ukita
    2000 Volume 2000 Issue 192 Pages 130-138
    Published: May 15, 2000
    Released on J-STAGE: March 01, 2011
    DOIhttps://doi.org/10.7209/tanso.2000.130
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    Many kinds of pure carbon and metal/carbon composite rods for fullerene synthesis have been prepared. Preparation and topics concerning these carbon rods are reviewed. Yield of empty fullerenes such as C60 and C70 is not influenced by either texture or by structure of carbon rod, however, high vaporization rate is observed for less graphitized one in arc discharge method. Existence of cα. 0.1mass% impurities in the pure carbon rod does not decrease fullerene yield, however, it is suggested that a small amount of some specific element may affect fullerene synthesis. Fullerenes with higher molecular weights are selectively synthesized by using boron/carbon composite rods (boronated graphite).To increase yield of endohedral metallofullerenes, elimination of water from the composite rod is very important, and high temperature-treatment of the rod such as 2000°C is found to be very effective.
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  • Control of Interface and Matrix Microstructure of C/C Composite by Alloying Techniques
    Eiichi Yasada
    2000 Volume 2000 Issue 192 Pages 139-143
    Published: May 15, 2000
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.7209/tanso.2000.139
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    C/C composites are all carbon materials consisting of high modulus and high strength carbon fiber as filler and the carbon matrix. It is not still completed material because of the difficulty to control the strong anisotropy of sp2. In this paper, recent research trend concerning the application of the alloying technique for carbon-carbon composites is introduced, after to begin with the way to approach the carbon alloys. On until now the research of carbon-carbon composite has been focussed by inclining mechanical function. However, the development of the multifunctional material, which composed of the functions such as thermal, electrical, magnetic, biofunction, surface, nuclear, etc. becomes important. I hope that large fruits will be obtained through the research of the carbon alloy and that the number of the fellow making the research of carbon-carbon composite increases.
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  • STM and AFM Techniques for Carbon Materials
    Masaya Kodama
    2000 Volume 2000 Issue 192 Pages 144-149
    Published: May 15, 2000
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.7209/tanso.2000.144
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  • Methods of Wear Measurements
    Akihiro Tanaka
    2000 Volume 2000 Issue 192 Pages 150-152
    Published: May 15, 2000
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.7209/tanso.2000.150
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  • Surface Analysis of Carbon Materials by Secondary Ion Mass Spectrometry
    Wei-Chun Xu, Takashi Kyotani
    2000 Volume 2000 Issue 192 Pages 153-156
    Published: May 15, 2000
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.7209/tanso.2000.153
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  • [title in Japanese]
    [in Japanese]
    2000 Volume 2000 Issue 192 Pages 157
    Published: May 15, 2000
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.7209/tanso.2000.157
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  • [title in Japanese]
    [in Japanese]
    2000 Volume 2000 Issue 192 Pages 160-161
    Published: May 15, 2000
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.7209/tanso.2000.160
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