巻号一覧
2005 巻 (2005)
- 220 号 p. 265-
- 219 号 p. 217-
- 218 号 p. 149-
- 217 号 p. 95-
- 216 号 p. 2-
2005 巻, 217 号
選択された号の論文の7件中1～7を表示しています
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Tomoyuki Okuni, Yasuhiro Sahashi, Atsushi Satsuma, Hidetaka Konno, Mic ...2005 年 2005 巻 217 号 p. 95-98
発行日: 2005/04/01
公開日: 2010/06/28
ジャーナル フリーDirect loading of fine particles of metallic Pd on an activated carbon was found in an acidic solution of PdCl2 at room temperature. Pd-loaded activated carbons thus prepared showed almost 100 % conversion of NO at a temperature above 350°C. The amount of Pd loaded on activated carbon could be controlled by the concentration of PdCl2 in the solution.抄録全体を表示PDF形式でダウンロード (2534K) -
大関 克知, ゴールマン ポリス, 篠原 邦夫2005 年 2005 巻 217 号 p. 99-103
発行日: 2005/04/01
公開日: 2010/06/28
ジャーナル フリーTo modify shape and surface of natural graphite particles, a relationship was experimentally investigated among operationalconditions of a mechano-fusion system, particle shape and powder characteristics. Consequently, for the raw material of low tapping density, the shape index, which is defined as a ratio of short to long axis of an approximated ellipse, was increased with the rotational speed and the treatment time. Whereas, for the graphite particles of high tapping density, the shape index was not affected so much by the operational conditions.
The median size and the width of particle size distribution and the specific surface were hardly changed after treatment, but the R-value by Raman spectroscopy was increased with the treatment time to suggest the change in crystallinity of particle surface.抄録全体を表示PDF形式でダウンロード (4199K) -
大久保 貴啓, 高橋 辰宏, 呉 勇周, 粟 野宏, 米竹 孝一郎, 大石 好行2005 年 2005 巻 217 号 p. 104-110
発行日: 2005/04/01
公開日: 2010/06/28
ジャーナル フリーCarbon fiber (CF) has outstanding mechanical, thermal, and electric characteristics, and it has strong anisotropy. To take advantage of the enhanced properties, the orientation control of CFs should be important. In recent years, the aligned carbon nanotube (CNT) /polymer composites have been produced by the application of high magnetic field. However, there are few reports about magnetically oriented CF/polymer composites. We have performed the magnetic processing of polymer composite films including CFs by using our magnetic processing machine (0.9 T) with permanent magnets, and a commercially available superconductive magnet (10 T). We have studied the orientation of CFs along the thickness direction of the film. The orientational distribution of CFs was analyzed by three dimensional optical microscope analysis in addition to X-ray diffraction. It was demonstrated that the oriented CF/polymer composite films were produced even by permanent magnets. The electric resistance of the film (vertically oriented CFs, 10wt.%), after magnetic processing (0.9T), was improved by the order of 109Ω·cm. It was also found that the film showed anisotropic electric property.抄録全体を表示PDF形式でダウンロード (3788K) -
Yutaka Kaburagi, Kenji Yokoi, Akira Yoshida, Yoshihiro Hishiyama2005 年 2005 巻 217 号 p. 111-114
発行日: 2005/04/01
公開日: 2010/06/28
ジャーナル フリーCommercially available PBO (poly (p-phenylene-benzo-bis-oxazole)) fibers were carbonized and heat-treated at 3000°C without mechanical treatements. The structure and texture of the 3000°C-treated PBO fibers were investigated by SEM observations and XRD and magnetoresistance measurements. The SEM images of the carbon fibers reveal carbon layers extending clearly along the fiber axis. Two types of textures in the cross sections were found. One is a radial texture and another is that like a palm-leaf fan spreading the carbon layers from a point near the periphery of the cross section. Average misorientation angle of carbon layers along the fiber axis was evaluated to be ±2° from the 002 X-ray diffraction. The interlayer spacing d002 and lattice constant along a-axis ao were 0.3355nm and 0.2461nm, respectively, and the crystallite sizes Lc and La exceeded 100nm. The average crystallite transverse magnetoresistance (Δρ/ρ) cr, and magnetoresistance anisotropy ratios rTL and γTL measured at 77K and in a magnetic field of 1T for the single filaments were 46%, and 0.007 and 0.68, respectively. The 3000°C-treated PBO fiber, therefore, can be characterized as a highly graphitized and highly oriented carbon fiber.抄録全体を表示PDF形式でダウンロード (3049K) -
辰巳 国昭2005 年 2005 巻 217 号 p. 115-122
発行日: 2005/04/01
公開日: 2010/06/28
ジャーナル フリーElectrochemical characteristics of low crystalline carbonaceous materials and carbonized non-graphitizable carbons as negative electrodes of rechargeable lithium-ion cells are reviewed, particularly from the viewpoint of the relationship linking the electrochemical characteristics and nano-structural features of these materials. These low crystalline materials show very attractive characteristics for negative electrodes of lithium-ion cells, e. g., reversible capacity higher than that of graphite (LiC6, 372mAh/g). In addition, carbonized non-graphitizable carbons display a significant capacity below 0.1V (vs. Li/Li+). These features are very important to improve specific energy of lithium-ion cells. 7Li-nuclear magnetic resonance (7Li-NMR) observation on lithium insertion into those materials suggested that lithium species in those materials are quite different from that in graphite. Lithium species in low crystalline carbonaceous materials have an ionic character. On the other hand, lithium in carbonized non-graphitizable carbons is classified into two species. One of the lithium species is the same as that in graphitizable carbons. However, the other lithium species are inferred to be lithium clusters, which gave 7Li-NMR peaks at 190 and 280ppm (vs. aq. LiCl) at -130°C. The structural characteristics, which form ionic lithium species and lithium clusters, are discussed.抄録全体を表示PDF形式でダウンロード (1741K) -
木島 正志2005 年 2005 巻 217 号 p. 123-130
発行日: 2005/04/01
公開日: 2010/06/28
ジャーナル フリーConjugated polymers having carbon-carbon triple bond in the main chain were prepared and carbonized by heat treatment under anaerobic conditions. Efficient carbonization behaviors of the polymers, which were investigated by thermal analyses and spectroscopies, were reviewed in this paper. The nano-structures of the carbonized materials derived from the polymer structures and the carbonization processes were evaluated in view of dimensions of graphitic crystallite and pore structures. It is suggested that the hard character of the aromatic conjugated polymers and the specific reactivity of the triple bonded portion of the main chain are appropriate for constructing carbon materials having nano-structured microporous carbons.抄録全体を表示PDF形式でダウンロード (5135K) -
山田 能生2005 年 2005 巻 217 号 p. 139
発行日: 2005/04/01
公開日: 2010/06/28
ジャーナル フリーPDF形式でダウンロード (221K)
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