巻号一覧
2008 巻 (2008)
- 235 号 p. 263-
- 234 号 p. 215-
- 233 号 p. 115-
- 232 号 p. 61-
- 231 号 p. 2-
2008 巻, 232 号
選択された号の論文の9件中1～9を表示しています
- |<
- <
- 1
- >
- >|
-
白石 壮志, 間明田 博清2008 年 2008 巻 232 号 p. 61-66
発行日: 2008/04/01
公開日: 2010/06/28
ジャーナル フリーNitrogen-enriched carbon materials were prepared by the heat-treatment of polyaniline (PANT). The electrochemical capacitance of the carbonized PANI in 1.0 mol dm-3 H2SO4 electrolyte depended on the heat-treatment. The carbonized PANI at 800°C showed good cycle performance and 157 F·g-1 of the gravimetric capacitance. The capacitance is lower than the original PANI, but it is comparable to conventional activated carbon fibers (ACF). The specific capacitance per BET surface area for the carbonized PANI was about 40 times as much as that for the ACF. The capacitance of the carbonized PANI was not correlated with the BET specific surface area, but strongly depended on the electronic conductivity and the nitrogen content. These results suggest the redox center of nitrogen-containing surface functionalites rather than the double layer charging as the capacitance origin for the carbonized PANI.抄録全体を表示PDF形式でダウンロード (1325K) -
森山 功之, 町田 基, 相川 正美, 立本 英機2008 年 2008 巻 232 号 p. 67-71
発行日: 2008/04/01
公開日: 2010/06/28
ジャーナル フリーAdsorption and desorption kinetics of phenol onto activated carbons with and without surface acidic oxygen functional groups were examined in aqueous solutions. Aniline was also used to compare with phenol. The surface oxygen groups was introduced by nitric acid oxidation after de-ashing, and completely removed by out-gassing, respectively. Langmuir isotherms could be successfully employed for both activated carbons. Application of Langmuir kinetic equation was limited to the oxidized carbons, whereas it was not fitted very well for the out-gassed carbons. For desorption experiments from the pre-adsorbed out-gassed carbons, first rapid desorption and consecutive slow re-adsorption was clearly observed for phenol and aniline, while only rapid desorption was measured from the oxidized carbons. Based on the results, for the oxidized carbons the adsorption was progressed by collision control kinetics between phenol and adsorption sites on the external carbon surface and meso- and macro-pore on the one hand, not only collision control but also diffusion control kinetics was included for the out-gassed carbons on the other hand. From the results of the temperature dependence of adsorption capacity and the aniline adsorption kinetics, coupling reaction accompanied by dehydration would be taken place on the out-gassed carbons simultaneously with the adsorption process.抄録全体を表示PDF形式でダウンロード (1086K) -
山口 貴司, 坂東 俊治, 飯島 澄男2008 年 2008 巻 232 号 p. 72-76
発行日: 2008/04/01
公開日: 2010/06/28
ジャーナル フリーLarge sized spherical graphitic particles with the diameter as large as several micrometers, so called giant graphite balls (GGBs), are more or less included in the sample of carbon nanohorns (CNHs) which are prepared by the method of pulsed arc-discharge or laser ablation. For the use of CNHs in the application, it is needed to decrease such impurity from the sample. In order to find a way to decrease the GGBs content, we investigate the origin of GGBs and find a simple method for increasing the sample purity. The origin of GGBs is the exfoliated materials from the carbon rod, and such an exfoliation can be nearly avoided by the preheat treatment of the carbon rod up to 1000°C just in advance of the arc vaporization. According to this preheat, the quantity of GGBs in the sample can be reduced from 30 to 0.01 % (100 ppm) by weight. In addition, it was found that the simple two-staged purification which is combined with the centrifugation and filtration effectively works for removing such a small quantity of GGBs.抄録全体を表示PDF形式でダウンロード (1883K) -
Osamu Yamamoto, Toshiaki Ohira, Dodda Jagan Mohan, Masayuki Fukuda, Bu ...2008 年 2008 巻 232 号 p. 77-81
発行日: 2008/04/01
公開日: 2010/06/28
ジャーナル フリーIn order to reduce oral diseases with bacterial growth, carbon-coated CaCO3/MgO powder possessing antibacterial activity was obtained by the pyrolysis of poly (vinyl alcohol)-dolomite mixture at 700°C r in an argon gas. Evaluation of the antibacterial activity was performed by colony count method, using Escherichia coli and Staphylococcus aureus. CaCO3 and MgO were formed at the temperature range from 400 to 700°C. At 800°C, CaO was produced by the calcination of CaCO3. The powders after PVA pyrolysis turned into black, i.e., the formation of carbon on its surface. In the case without PVA, the formation temperature of CaCO3/MgO exceeded 100°C than the mixture of dolomite and PVA. Antibacterial activity of the carbon-coated CaCO3/MgO powder against Staphylococcus aureus was found to be stronger than against Escherichia coli. Comparing with CaCO3/MgO powder without carbon, it was found that the antibacterial action was reduced by forming carbon on its surface.抄録全体を表示PDF形式でダウンロード (968K) -
塩山 洋2008 年 2008 巻 232 号 p. 82-84
発行日: 2008/04/01
公開日: 2010/06/28
ジャーナル フリーBehavior of excited [Ru (bpy) 3] 2+ with electron acceptor quencher C60F36 has been investigated by measurements of luminescence quenching. Cationic [Ru (bpy) 3] 2+ is adsorbed on the anionic surface of Nafion aggregates in ethanol, and its luminescence was found not to be easily quenched by C60F36. C60F36 molecules are anticipated to exist in Nafion aggregates, which is easily explained by the affinity of C60F36 for the fluorocarbon component of Nafion. This affinity is also supported by a dynamic light scattering (DLS) measurement.抄録全体を表示PDF形式でダウンロード (663K) -
Wolfgang Klose, Arndt-Peter Schinkel2008 年 2008 巻 232 号 p. 85-91
発行日: 2008/04/01
公開日: 2010/06/28
ジャーナル フリーThis paper gives an overview of the activities of the German Carbon Group called Arbeitskreis Kohlenstoff and of related institutions and industries. A short review of the history of German carbon research and development is carried out, starting with the industrialisation and the foundation of still working companies. The structure of the German Carbon Group with its technical committees is explained. Furthermore, the relation and activities of the European Carbon Group is given. A selection of the multitude activities of the German Carbon Group has been made. Therefore, the big carbon companies are considered like SGL Carbon, Schunk Kohlenstofftechnik, Evonik-Degussa, Rutgers-CarboTech, and Graphit Kropfmuhl. Additionally, the small enterprise Chemical Vapour Technology and the University of Erlangen are mentioned.抄録全体を表示PDF形式でダウンロード (3306K) -
白石 壮志, 棚池 修2008 年 2008 巻 232 号 p. 92-97
発行日: 2008/04/01
公開日: 2010/06/28
ジャーナル フリーPDF形式でダウンロード (2853K) -
青木 宏之, 池田 功, 桐山 哲也, 清田 昌宏2008 年 2008 巻 232 号 p. 98-107
発行日: 2008/04/01
公開日: 2010/06/28
ジャーナル フリーPDF形式でダウンロード (4716K) -
白石 壮志2008 年 2008 巻 232 号 p. 109
発行日: 2008/04/01
公開日: 2010/06/28
ジャーナル フリーPDF形式でダウンロード (166K)
- |<
- <
- 1
- >
- >|