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Volume 2003 (2003)
- Issue 210 Pages 199-
- Issue 209 Pages 159-
- Issue 208 Pages 109-
- Issue 207 Pages 65-
- Issue 206 Pages 2-
Volume 2003, Issue 208
Displaying 1-6 of 6 articles from this issue
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Katsuhisa Maruyama, Hideyuki Takagi, Masaya Kodama, Hiroaki Hatori, Yo ...2003 Volume 2003 Issue 208 Pages 109-113
Published: July 25, 2003
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSActivated carbon and bamboo charcoal were modified by the liquid phase oxidation using (NH4) 2S2O8 and the ammonia adsorption properties were investigated. The amount of acidic functional groups on activated carbon increased with treatment time in (NH4) 2S2O8 solution. The introduction of acidic functional groups caused an increase of the amount of chemisorbed ammonia as well as the improvement of physisorption properties at low relative pressures. The bamboo charcoal showed higher potential of ammonia physisorption than the activated carbon, though the ammonia adsorption ability was unchanged by liquid phase oxidation because acidic functional groups were hardly introduced on the surface.View full abstractDownload PDF (793K) -
Ikuo Abe, Satoshi Iwasaki, Koji Asami, Jiro Senda2003 Volume 2003 Issue 208 Pages 114-119
Published: July 25, 2003
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSMicroporous carbons were prepared by carbonizing and activating bamboo (Phyllostachys pubescens Mazel ex Houzeau de Lehaie). Steam, carbon dioxide, or air was used as the activating agent. When bamboo-based activated carbons with the same iodine-adsorption performance were prepared, activation with air gave lower activation yield than that with steam or carbon dioxide. The pore-size distribution of bamboo-based carbons activated with carbon dioxide and air was very similar. The mean pore diameter of bamboo-based carbon activated with steam was slightly larger than that activated with the other activation methods. The formation of micropores proceeded more effectively in carbon prepared from bamboo than that prepared from coconut shell. The pore diameter of activated carbon made from bamboo was smaller than that made from coal or wood, and similar to that made from coconut shell. The amount of 4-nonylphenol adsorbed onto the bamboo activated carbon was very high, even in highly dilute solution.View full abstractDownload PDF (802K) -
Yoshiki Sato, Yoshihiro Endo, Yutaka Miura2003 Volume 2003 Issue 208 Pages 120-125
Published: July 25, 2003
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe recycling of carbon fiber reinforced plastics (CFRP: including 37wt% of matrix epoxy resin) using tetralin (hydrogen donor solvent), decalin (nondonor solvent), alcohols and light cycle oil (LCO) was carried out in a small autoclave at 350-440°C with a reaction time of 1h under 2MPa of initial nitrogen atmosphere. For the reaction using tetralin, decalin and alcohols, the gaseous product was small of 0.2-4wt%, while the gaseous product increased to 9.4wt% using LCO. Conversion of resin varied with reaction temperature and solvent. Conversion of resin by the use of tetralin at 440°C showed more than 95wt% and enough tensile strength of recovered monofilament was observed.
Similar high conversion and high grade quality of the recovered monofilament were also obtained by the use of cyclohexanol and other higher alcohols with sodium carbonate catalyst at 440°C. In these cases, phenol and alkylphenols were detected with 3.8-5.1wt%/CFRP (10.3-13.8wt%/resin) in the liquid product. This indicates that the degradation of thermosetting epoxy resin proceed effectively to produce monomer compounds with small gas production. However conversion of resin and tensile strength of the recovered monofilaments decreased at the lowering reaction temperature and the other solvent use.View full abstractDownload PDF (1296K) -
Kyoichi Oshida, Takashi Yanagisawa, Morinobu Endo2003 Volume 2003 Issue 208 Pages 126-134
Published: July 25, 2003
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSImage analysis techniques have been applied to TEM (transmission electron microscopy) observation of carbon materials, in order to evaluate the texture and structure of carbons visually and quantitatively. Although X-ray diffraction, various spectroscopy, and transport measurements have been widely used as techniques for quantitative analyzing carbonbased materials, it is difficult to attain atomic resolution from these results. Whole and partial images of materials can be observed in various magnifications by means of electron microscopy. The microscopic observation, however, is not quantitative by itself. In the present paper, structure and defects of ordered and disordered carbon materials are analyzed quantitatively by TEM combined with image analysis, which can provide a powerful tool to characterize the carbons from another viewpoint.View full abstractDownload PDF (10110K) -
Masahiro Ishihara2003 Volume 2003 Issue 208 Pages 135-144
Published: July 25, 2003
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSCarbon fiber reinforced carbon matrix composite (C/C composite) is thought to be one of promising structural materials with high temperature resistivity in the nuclear engineering field. In the high temperature gas-cooled reactors with gas outlet temperature maximum around 1000°C, high performance core internal structures, such as control rod sheath, core restraint mechanism, will be expected to achieve by the C/C composite application. Moreover, in the fusion reactors, plasma facing structures having high temperature with high neutron irradiation and particle collision will be expected to achieve by the C/C composite application. In this paper, current research and development studies of the C/C composite application on both reactors are reviewed and vista of the future on the C/C composite application is mentioned.View full abstractDownload PDF (1759K) -
2003 Volume 2003 Issue 208 Pages 150-153
Published: July 25, 2003
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (626K)
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