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Volume 1997 (1997)
- Issue 180 Pages 217-
- Issue 179 Pages 145-
- Issue 178 Pages 101-
- Issue 177 Pages 59-
- Issue 176 Pages 2-
Volume 1997, Issue 177
Displaying 1-9 of 9 articles from this issue
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[in Japanese], [in Japanese], [in Japanese]1997 Volume 1997 Issue 177 Pages 59-63
Published: May 15, 1997
Released on J-STAGE: March 01, 2011
JOURNAL FREE ACCESSIn a liquid crystal phase, aromatic carbons of a mesophase pitch are observed at lower field in a 13C NMR spectrum compared those of an isotropic pitch. When an aromatic compound is added to a mesophase pitch, some molecules of the compound ordered in the pitch and the fluctuation amplitude of the molecules is the same as that of the pitch constituents. Thus a fluctuation amplitude of a mesophase-pitch constituents in a liquid crystal phase can be determined from 13C NMR signals of an added compound whose chemical shift tesor has been determined. In this paper, we proposed a method to estimate a molecular shape an average molecule of a mesophase-pitch constituents from high temperature 13C NMR spectrum of the pitch containing coronene, and applied it to some mesophase pitches.View full abstractDownload PDF (2473K) -
Yori Izumi, Hidetoshi Ishihara, Takeo Ohte, Akira Kojima1997 Volume 1997 Issue 177 Pages 64-69
Published: May 15, 1997
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSAn investigation was conducted on the formation of controlled plasma of mixed gas (SF6+Ar) and accurate control of surface characteristics of carbon material with low-damage by this plasma. We developed a method to control the plasma composition elements and the sheath voltage independently of the other plasma parameters. A controlled plasma with high ion density, low sheath voltage and designated gas-flow ratio γ, which is (flow rate of SF6) / (flow rate of SF6 +flow rate of Ar) was formed by this method. The surface of glassy carbon (GC) was modified by this plasma. In order to estimate effects of the surface modification, the contact angle of water to the glassy carbon surface and ESCA spectra before and after plasma surface modification were measured. To evaluate the damages to the glassy carbon surface, we observed the surface by SEM and measured Raman spectra.
It was found from these results that accurate and wide-range control of surface characteristics of carbon materials with low-damage can be carried out by using the controlled plasma of mixed gas of (SF6 +Ar) with high ion density and moderately low sheath voltage.View full abstractDownload PDF (3219K) -
Y. Nagata, H. Hatori, M. Shiraishi1997 Volume 1997 Issue 177 Pages 70-75
Published: May 15, 1997
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSNew carbon fine particles were prepared by heat-treatment of highly crystalline polyimide particles at above 1000°C. Such particles were obtained as the result of thermal imidization of polyamic acids in N-methyl-2-pyrrolidon. Thermal decomposition of polyimide particles started from about 500°C and almost finished until 1000°C in a yield of 50%. The morphologies of carbon particles obtained were unique like a whisker or coral with the particle size from 1 to 5μm, judging from the observation of SEM. The polyimide particles kept such unique morphologies throughout their decomposition and carbonization processes. By the treatment at 2800°C, carbon particles were found to be almost graphitized from the observation by TEM or electron diffraction patterns that showed the stacking of graphite layers.View full abstractDownload PDF (8684K) -
Hirokazu Oda, Ryuzou Tohjo, Akio Nomura1997 Volume 1997 Issue 177 Pages 76-79
Published: May 15, 1997
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSIn order to obtain porous carbon materials with meso pores, Phenol-formaldehyde resin (PFR) containing sawdust was immersed in 50wt % KOH aqueous solution and heated to 973 - 1223 K in N2 (PFR-saw dust). Meanwhile PF resin carbonized at 873K was mixed with an excess amount of KOH, and heated to 1073 K in N2 (PFR-KOH). The carbons thus obtained were investigated pore structure by measurement of BET surface area and pore-size distribution. Adsorption behaviour of Phenol, Aniline and DBS from aqueous solution was studied and adsorption tests for various kinds of organic vapor were also carried out. PFR-sawdust and PFR-KOH had surface areas of 1, 500 and 3, 000 m2/g, respectively. PFR-sawdust AC showed high adsorption capacity for liquid phase. A large number of open pores formed on the external surface whose diameter was 2 - 5μm. It seems that these pores were formed by gasification of sawdust with KOH.View full abstractDownload PDF (1599K) -
Michio Inagaki1997 Volume 1997 Issue 177 Pages 80-82
Published: May 15, 1997
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (399K) -
Seung-Kon Ryu1997 Volume 1997 Issue 177 Pages 83-86
Published: May 15, 1997
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSCarbon researches and industries in Korea is far behind the advanced countries. Almost all carbon products are being imported from Japan, America, Germany, and France. From 1980, some institutes and universities have started to research carbon materials. Recently some small and medium scale industries were established to produce carbon materials such as active carbon, graphite heating element, carbon black, carbon fibers, and so on. However, the production scale is very small. In Korea, we have no carbon society as yet. Recently many carbon researches and Industry men have an interest to establish a carbon materials society in Korea.View full abstractDownload PDF (486K) -
Cheng Huiming, Yuan Tiecheng, Kang Yuncheng, Zhongyu XU1997 Volume 1997 Issue 177 Pages 87-90
Published: May 15, 1997
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESShe roles and functions of two carbon-related scientific societies in China, the Carbon Materials Society of Chinese Society For Metals and the Carbon-Graphite Materials Committee of the Chinese Electro-technology Society, are introduced. The research activities of Chinese main universities and institutes on carbon are also briefly reviewed and the main manufacturers of carbon products in China are listed. From the paper one can generally understand the present status of research, development and production on carbon in China.View full abstractDownload PDF (757K) -
[in Japanese]1997 Volume 1997 Issue 177 Pages 91
Published: May 15, 1997
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (1290K) -
[in Japanese]1997 Volume 1997 Issue 177 Pages 94
Published: May 15, 1997
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (167K)
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