巻号一覧
2016 巻 (2016)
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- 271 号 p. 1-
2016 巻, 271 号
選択された号の論文の5件中1～5を表示しています
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巻頭言
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京谷 隆原稿種別: 巻頭言
2016 年 2016 巻 271 号 p. 1
発行日: 2016/01/15
公開日: 2016/03/22
ジャーナル 認証ありPDF形式でダウンロード (358K)
論文
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岡田 雅樹, 吉本 修, 辰巳 誠, 太田 直人原稿種別: 論文
2016 年 2016 巻 271 号 p. 2-9
発行日: 2016/01/15
公開日: 2016/03/22
ジャーナル フリーGraphite materials are often used for heaters in industrial furnaces that are expected to attain temperatures higher than 2000 °C. This study investigated the effect of gas atmosphere on the resistance of a box-shaped heater made from isotropic graphite. The influence of impurities was also investigated by comparing different purities of isotropic graphites (Toyo Tanso IG-11 and IG-110U) as a heater material and by heating a coke to reproduce a realistic operation condition. The temperature dependence of the resistivity of the isotropic graphites, which we measured by a direct heating method, showed that, after passing through a minimum at approximately 600 °C, the resistivity increases monotonically with increasing temperature up to 3000 °C. The resistance of the graphite heater exhibited the same temperature dependence in nitrogen and helium atmospheres. However, its resistance decreased above 2000 °C in an argon atmosphere, probably due to the ionization of argon to a conductive gas. This resistance decrease was made more severe by the vapor released from the heater itself, probably due to the vaporization of metallic impurities, as well as from the coke that was being heat-treated in the furnace.抄録全体を表示PDF形式でダウンロード (1120K)
ノート
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宮嶋 尚哉, 幸脇 悠人, 松村 泰悠, 阪根 英人, 棚池 修原稿種別: ノート
2016 年 2016 巻 271 号 p. 10-14
発行日: 2016/01/15
公開日: 2016/03/22
ジャーナル フリーTypical D-glucose derivatives were treated with iodine and carbonized at 800 °C in order to investigate the effect on carbonization yield and porosity caused by iodine stabilization of the saccharide materials. Carbonization yield was similarly increased by iodine-assisted polymerization of the precursor polymer in every raw derivative even after a small amount of iodine treatment. There was no apparent difference among the saccharides used. On the other hand, the characteristic development of micropores in the carbons produced from precursors that had received the iodine treatment depended strongly on the raw material. Cellulose and chitosan which undergo solid-phase carbonization showed no micropore development even after extensive iodine stabilization treatment, whereas D-glucose and starch which normally undergo liquid-phase carbonization contain a significant amount of microporosity if the iodine stabilization was sufficient to result in solid-phase carbonization.抄録全体を表示PDF形式でダウンロード (1430K)
総説
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仁科 勇太原稿種別: 総説
2016 年 2016 巻 271 号 p. 15-24
発行日: 2016/01/15
公開日: 2016/03/22
ジャーナル 認証ありOxidation of graphite produces graphite oxide and/or graphene oxide, both of which are abbreviated “GO”. The preparation methods of these materials have been described by Brodie, Staudenmaier, and Hummers. Graphene oxide is widely recognized as a promising material in various fields, but its structure and composition has still not been fully controlled. In this article, general strategies to control the structure, particle size, and oxidation degree of graphene-like materials are introduced with emphasis on the oxidation of graphite by KMnO4 in H2SO4 (oGO) and the reduction of highly oxidized graphene oxide by hydrazine (rGO). Even though the oxygen content is the same, oGO and rGO have different properties, such as adsorption ability, oxidation ability, and electronic conductivity, because of differences in the persisting graphitic structure and defects. These results can be used as a guideline for the production of tailor-made GO. The current method of GO preparation is also discussed.抄録全体を表示PDF形式でダウンロード (2643K)
レポート
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衣本 太郎, 園田 峻原稿種別: レポート
2016 年 2016 巻 271 号 p. 32
発行日: 2016/01/15
公開日: 2016/03/22
ジャーナル 認証ありPDF形式でダウンロード (494K)
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