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Production of microporous carbon by air activation
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capacity for electrical applications of the fibers. It is indicated that MPCFs have very high current capacity, as around 2.5 *105 J/mm2, up to burning-off by joule heating, increasing with modulus of the fibers, The cross-section morphologies of the fibers are emphasized after burning-off, which characterize the structure of the original fibers. Similar experiments have been done for pitch-based activated carbon fibers, and show the characteristic feature of burning-off caused by the porous structure. (TANS0 1996 (No. 17 1) 30-351
Preparation of CVD Carbon Films from Decacyclene and their Electrical Conductivity by Yoshiharu Nakadoi, Tomohiko Kaneko and Sugio Otani.
thin films were measured by analytical instruments. As a result, it was found that the thickness of the obtained carbon thin films was controlled in the range of O.l- 1.5mm by changing raw material, temperature, reaction time, and the flow rate of carrier gas, and the electrical conductivity tended to increase with decreasing thickness. [TANSO 1996 (No. 17 1) 36-381 Global Environment, Carbon, Materials by Jumpei Ando
and
Carbon
(no abstract or affiliatmn supplied) [TANSO 1996 (No. 171) 39-44
School of High-Technology for Human Welfare, Toka University, Nishino, Numazu-shi, Shizuoka 410-03, Japan.
Carbon thin films were prepared from decacyclenc on quartz substrates with a chemical vapor deposition (CVD) process at 900°C under various conditions. The thickness and the electrical conductivity of these carbon
TANS0
No. 173 - ABSTRACTS
Production of Microporous Carbon by Air Activation by Ikuo Abe, Mitsunori Hitomi*, Nobuo Ikuta, Hideki Tatsumoto**, Yoshiya Kera*
Pore Analysis of Isotropic Graphite using Image Processing of Optical Micrographs by Kyoichi Oshida, Naotaka Ekinaga*, Morinobu Endo** and
Osaka Municipal Technical Research Institute: Morinomiya l-6 50. Joto-ku, Osaka 536, Japan; *Department of Applied Chemistry, Faculty of Science and Engineering, Kinki Umversity, 3-4-l Kowakae, Higashi-Osaka 577, Japan; **Department of Apphed Chemistry, Faculty of Engineering, University of Chiba, Yayoicho, Inage-ku, Chiba 263, Japan.
Nagano National College of Technology, 716. Tokuma, Nagano 381, Japan; * Hohfu Plant. Tokai Carbon Co.. Ltd., 569, Hamakata, Hohfu 747, Japan; ** Shinshu University, 500, Wakasato, Nagano 380, Japan; *** Hokkaldo University, 13-8, Kita-ku, Sapporo 060, Japan.
Microporous carbons were produced by an activation using air from Japanese cypress charcoal. Effects of activation time, activation temperature, and air flow rate on the yield, porosity, and adsorption property of the microporous carbons were examined and the following results were obtained:(1) Weight loss increases linearly with activation time. (2) The formation efficiency of pores which have an adsorption ability increases with activation temperature. (3) When the weight loss is above 958, the adsorption ability decreases. (4) The activation efficiency increases with decreasing air flow rate. (5) When activation temperature and air flow rate are constant, the specific surface area and mean pore diameter increase with activation time. (6) When the specific surface area is constant, the mean pore diameter decreases with increasing activation temperature. (7) The mean pore diameter increases with weight loss. [TANSO 1996 (No.173) 137-1411
Strength parameters of isotropic high-density graphite are thought to be strongly correlated to the pore structure from experimental results on fracture toughness. Until now the pore structure has not been analyzed quantitatively, and the relation between the strength parameters and the pore structure has not been explained clearly. In the present paper, the pore structure of the isotropic graphite has been analyzed by means of a polarizing microscope combined with an image analyzer. The polarizing microscope images of the isotropic graphite are digitized using an image The distribution of area size, number, scanner. circularity, and fractal dimension of cross-section of the pores are measured, and are analyzed quantitatively. When there is an increase in the number of small pores, the elastic modulus and bend strength also increase. We believe that a structure which includes many pores increases plant strain fracture toughness (KIC) critical crack opening displacement (COD) , because crack propagation can be inhibited by the pores. [TANSO 1996 (No.173) 142-1471
Michio
Inagaki***
-
capacity for electrical applications of the fibers. It is indicated that MPCFs have very high current capacity, as around 2.5 *105 J/mm2, up to burning-off by joule heating, increasing with modulus of the fibers, The cross-section morphologies of the fibers are emphasized after burning-off, which characterize the structure of the original fibers. Similar experiments have been done for pitch-based activated carbon fibers, and show the characteristic feature of burning-off caused by the porous structure. (TANS0 1996 (No. 17 1) 30-351
Preparation of CVD Carbon Films from Decacyclene and their Electrical Conductivity by Yoshiharu Nakadoi, Tomohiko Kaneko and Sugio Otani.
thin films were measured by analytical instruments. As a result, it was found that the thickness of the obtained carbon thin films was controlled in the range of O.l- 1.5mm by changing raw material, temperature, reaction time, and the flow rate of carrier gas, and the electrical conductivity tended to increase with decreasing thickness. [TANSO 1996 (No. 17 1) 36-381 Global Environment, Carbon, Materials by Jumpei Ando
and
Carbon
(no abstract or affiliatmn supplied) [TANSO 1996 (No. 171) 39-44
School of High-Technology for Human Welfare, Toka University, Nishino, Numazu-shi, Shizuoka 410-03, Japan.
Carbon thin films were prepared from decacyclenc on quartz substrates with a chemical vapor deposition (CVD) process at 900°C under various conditions. The thickness and the electrical conductivity of these carbon
TANS0
No. 173 - ABSTRACTS
Production of Microporous Carbon by Air Activation by Ikuo Abe, Mitsunori Hitomi*, Nobuo Ikuta, Hideki Tatsumoto**, Yoshiya Kera*
Pore Analysis of Isotropic Graphite using Image Processing of Optical Micrographs by Kyoichi Oshida, Naotaka Ekinaga*, Morinobu Endo** and
Osaka Municipal Technical Research Institute: Morinomiya l-6 50. Joto-ku, Osaka 536, Japan; *Department of Applied Chemistry, Faculty of Science and Engineering, Kinki Umversity, 3-4-l Kowakae, Higashi-Osaka 577, Japan; **Department of Apphed Chemistry, Faculty of Engineering, University of Chiba, Yayoicho, Inage-ku, Chiba 263, Japan.
Nagano National College of Technology, 716. Tokuma, Nagano 381, Japan; * Hohfu Plant. Tokai Carbon Co.. Ltd., 569, Hamakata, Hohfu 747, Japan; ** Shinshu University, 500, Wakasato, Nagano 380, Japan; *** Hokkaldo University, 13-8, Kita-ku, Sapporo 060, Japan.
Microporous carbons were produced by an activation using air from Japanese cypress charcoal. Effects of activation time, activation temperature, and air flow rate on the yield, porosity, and adsorption property of the microporous carbons were examined and the following results were obtained:(1) Weight loss increases linearly with activation time. (2) The formation efficiency of pores which have an adsorption ability increases with activation temperature. (3) When the weight loss is above 958, the adsorption ability decreases. (4) The activation efficiency increases with decreasing air flow rate. (5) When activation temperature and air flow rate are constant, the specific surface area and mean pore diameter increase with activation time. (6) When the specific surface area is constant, the mean pore diameter decreases with increasing activation temperature. (7) The mean pore diameter increases with weight loss. [TANSO 1996 (No.173) 137-1411
Strength parameters of isotropic high-density graphite are thought to be strongly correlated to the pore structure from experimental results on fracture toughness. Until now the pore structure has not been analyzed quantitatively, and the relation between the strength parameters and the pore structure has not been explained clearly. In the present paper, the pore structure of the isotropic graphite has been analyzed by means of a polarizing microscope combined with an image analyzer. The polarizing microscope images of the isotropic graphite are digitized using an image The distribution of area size, number, scanner. circularity, and fractal dimension of cross-section of the pores are measured, and are analyzed quantitatively. When there is an increase in the number of small pores, the elastic modulus and bend strength also increase. We believe that a structure which includes many pores increases plant strain fracture toughness (KIC) critical crack opening displacement (COD) , because crack propagation can be inhibited by the pores. [TANSO 1996 (No.173) 142-1471
Michio
Inagaki***
-