巻号一覧
2003 巻 (2003)
- 210 号 p. 199-
- 209 号 p. 159-
- 208 号 p. 109-
- 207 号 p. 65-
- 206 号 p. 2-
2003 巻, 209 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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佐藤 栄治, 高橋 辰宏, 夏目 拓, 小山 清人2003 年 2003 巻 209 号 p. 159-164
発行日: 2003/10/06
公開日: 2010/06/28
ジャーナル フリーWe have investigated the effect of dissolving organic polymers on the dispersion of VGCF (vapor-grown carbon fiber) TM in various organic solvents through optical microscope observation. VGCFTM as received had aggregated structure with particle shapes having a broad diameter distribution. We have used tetrahydrofran (THF), dimethylformamid (DMF), benzene (BZ), and dichloromethane (DCM) as organic solvents, and polycarbonate (PC), polystyrene (PS), and polymethylmethacrylate (PMMA) as organic polymers. After stirring VGCFTM in each organic solvent, most VGCFTM was remained as the aggregated particle structure which had similar structure as received. However, it was found that VGCFTM aggregated particles disappeared and were dispersed individually by dissolving organic polymers in the solvents after stirring for 30min. We have discussed the correlation between the polymer structures and the dispersion of VGCFTM. Furthermore, several drops of THF/PC solution containing individually dispersed VGCFTM, which was the best composition in the series of experiments which used four solvents and three polymers, was put on a cover glass, and THF was removed by spin coating, resulting in PC/VGCFTM thin film on the cover glass. PC was decomposed by heat treatment, and only dispersed VGCFTM whose both ends were clearly observed on the cover glass were finally obtained. Through measuring the length of VGCFTM by SEM with the help of an image analysis soft ware, the exact averaged length was determined.抄録全体を表示PDF形式でダウンロード (1644K) -
加藤 攻, 上村 誠一, 光来 要三, 持田 勲2003 年 2003 巻 209 号 p. 165-170
発行日: 2003/10/06
公開日: 2010/06/28
ジャーナル フリーModifications of decant oil (DCO) were carried out to prepare carbon fiber with higher tensile modulus and compressive strength. DCO was hydrogenated using Ni/Mo catalyst to different extent of 6 to 18mol/kg. The hydrogenated DCO was further heat-treated at 420°C for 2h under 1MPa to prepare mesophase pitch with 30% anisotropic content. Thus prepared mesophase pitch, pitch-A which was derived from H3-DCO (18mol/kg added H2) was failed to be spun into fiber form. It was found that the series of solvent extraction operations to remove lighter and heavier fractions (pitch-B) of pitch-A was effective to achieve the smooth spinning of fiber. It was indicated by DSC and high temperature 13C-NMR that pitch-A consisted of two phases at the spinning temperature. Such evidences were not found for pitch-B. The carbon fiber prepared from pitch-B showed lower Lc (crystallite size along C-direction) and higher recoil strength, which correspond to compressive strength, than the conventional pitch based carbon fiber made from mesophase pitch with 100% anisotropy at the same tensile modulus.抄録全体を表示PDF形式でダウンロード (1080K) -
カーボンナノチューブを用いたシート型触媒への適用例塩山 洋, 山田 祐介, 西良 友紀2003 年 2003 巻 209 号 p. 171-173
発行日: 2003/10/06
公開日: 2010/06/28
ジャーナル フリーCarbon nanotubes grown perpendicularly on a silicon substrate were used as supports of fine platinum particles. Activity for catalytic combustion of hydrogen on the catalyst sheets was evaluated rapidly by the use of infrared imaging thermography. The thermographic image of the catalysts during hydrogen combustion reveals that platinum contents and conditions in preparation of catalysts, such as heat treatment temperatures or solvents used, affects the catalytic activity. The infrared thermography has therefore been shown to be a technique in evaluating catalytic activity.抄録全体を表示PDF形式でダウンロード (2764K) -
松本 里香2003 年 2003 巻 209 号 p. 174-178
発行日: 2003/10/06
公開日: 2010/06/28
ジャーナル フリーA convenient procedure in estimating the conductive carrier concentrations and mobilities of graphites and graphite intercalation compounds (GICs) is described. For graphites and most of GICs, which have two-carriers conductive model, the estimation process of their carrier concentrations and mobilities from their experimental values of galvanomagnetic properties is rather tedious problem. Here it is introduced a convenient and reasonably precise approximation procedure by applying Newton's method, and some typical results of calculation on graphites and Br GICs are shown.抄録全体を表示PDF形式でダウンロード (557K) -
大澤 映二2003 年 2003 巻 209 号 p. 183-186
発行日: 2003/10/06
公開日: 2010/06/28
ジャーナル フリーPDF形式でダウンロード (785K)
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