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Volume 2000 (2000)
- Issue 195 Pages 329-
- Issue 194 Pages 243-
- Issue 193 Pages 175-
- Issue 192 Pages 113-
- Issue 191 Pages 2-
Volume 2000, Issue 193
Displaying 1-12 of 12 articles from this issue
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Mitsuyoshi Amari, Kazuro Kawamura2000 Volume 2000 Issue 193 Pages 175-179
Published: July 30, 2000
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSChanges of the bending strength σ and the lattice strain ε of a glassy carbon manufactured by the carbonization of phenol-formaldehyde resin at 1000°C were examined in connection with the bulk density p and the crystallite size Lc in the heat treatment temperatures (HTT) ranging from 1000 to 2800°C for the heat treatment times (HTt) of 1h and 9h. The values of σ and p attained the maximum at cα. 1250°C, and the relationship of σ∝ρn was recognized. The exponent n has different values below and above 2000°C. The lattice strain ε estimated from the (002) and (004) reflections by using the equation, cosθ/λ=K/Lc+2ε·sinθ/λ, showed negative values, and decreased with the increase in Lc. The relationship, Lc·ε=constant, was recognized. A significant effect of HTt on the values of Lc and ε was confirmed at the HTTs above 1750°C but it is insignificant for the values of σ.View full abstractDownload PDF (542K) -
Juji Mondori, Chiharu Yamaguchi, Isao Mochida2000 Volume 2000 Issue 193 Pages 180-185
Published: July 30, 2000
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe isotropic precursor pitches for general purpose carbon fibers and activated carbon fibers were prepared from coal tars of various origins through air-blowing reaction. The coal tars and isotropic pitches were characterized by means of solvent fractionation and NMR spectroscopy. The quality of the isotropic pitches was evaluated in terms of their spinning continuity, stabilization reactivity, strength of the resultant carbon fibers and yield of activated carbon fibers. The coal tar carrying higher aliphatic carbon content was found to produce the general purpose carbon fibers of high quality at a lower yield. In contrast all tars provided the activated carbon fiber of the same surface area at the same yield of 9% on coal tar base regardless of their variable properties.View full abstractDownload PDF (869K) -
Fundamental and Application to Display DevicesYahachi Saito2000 Volume 2000 Issue 193 Pages 186-191
Published: July 30, 2000
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSCarbon nanofibers possess the following properties favorable for field emitters: (1) high aspect ratio, (2) small radius of curvature at their tips, (3) high chemical stability and (4) excellent mechanical strength. Field emission microscopy (FEM) study was carried out using various types of nanofibers including multiwall nanotubes (MWNTs), single-wall nanotubes (SWNTs) and vapor grown carbon fibers (VGCFs). Field emission patterns and current versus voltage characteristics are discussed. As an application of nanotube field emitters, field emission displays (FED) equipped with nanotube cathodes are now attracting considerable attention. Fabrication and performance of nanotube-based FED elements are briefly reviewed.View full abstractDownload PDF (3405K) -
Susumu Yoshimura2000 Volume 2000 Issue 193 Pages 192-200
Published: July 30, 2000
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSπ-Electron materials, which are defined as materials having extended π-electron clouds in the solid state, have various peculiar properties such as high electron mobility and chemical/biological activities. This paper reports newly developed techniques for synthesizing carbonaceous π-electron materials, especially crystalline graphite and carbon nanotubes, at temperatures below 1000°C. This paper also surveys new types of physical and chemical interactions between π-electron materials and various other materials, presenting the promise for technological applications based on those π-electron materials. The applications include electronic devices, energy storage devices and mechanical applications, some of which will surely be put into commercial use in the near future.View full abstractDownload PDF (4103K) -
Yoichiro Sato2000 Volume 2000 Issue 193 Pages 201-208
Published: July 30, 2000
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe research and development of diamond as a functional material has been reviewed focusing attention on diamond films synthesized by chemical vapor deposition (CVD). Diamond has a potential as a versatile functional material characterized by unique properties. Initially, a brief overview on the relation between the well-known properties and applications is given. It is shown that practical applications rely on polycrystalline films, while future applications as semiconductors or solid state lasers rely on single crystal films and require further technical advancement in high quality (and high purity) crystal growth, epitaxial growth and impurity doping. It is also pointed out that the unique surface property of diamond provides new fields of applications in addition to those that utilize the known bulk properties. A few examples of interesting applications including surface acoustic wave (SAW) filters andelectrodes for electrochemical uses, and results of surface studies are described in some detail. Interesting topics related to future applications are described briefly covering various categories as an overview for future possibilities.View full abstractDownload PDF (1280K) -
Morinobu Endo, Chan Kim, Kazuyuki Miyashita, Kunio Nishimura, Takuya H ...2000 Volume 2000 Issue 193 Pages 209-217
Published: July 30, 2000
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSLi-ion secondary batteries are currently the best electric energy storage device for portable electronic equipments. Recent development of the Li-ion secondary batteries has been achieved mainly by the use of selected carbon and graphite materials as an anode. The performances of Li-ion secondary batteries, such as the charge/discharge capacity, voltage profile and cyclic stability, depend strongly on the microstructure of the anode materials made by carbon or graphite. By the contribution of the carbon materials used in anode in last five years, the capacity of the typical Li-ion secondary battery has been improved by a factor of 1.7. However, it is still being studied actively to identify the key parameters for the preparation of carbons that can provide better anode properties. The reason for this is that carbon and graphite materials have large varieties in their microstructure, texture, crystallinity and morphology depending on their preparation processes and precursor materials, as well as various macroscopic forms such as powder, fibers and spherules. In the present article, we describe the correlation between the microstructural parameters and electrochemical properties of conventional and novel types of carbon materials for Li-ion secondary batteries. The carbon materials dealt in this article are: graphitizable carbons such as milled mesophase pitch-based carbon fibers (MPCF), vapor grown carbon fiber (VGCF), polyparaphenylene (PPP) polyvinylidene chloride (PVDC)-based carbon heat-treated at low temperatures and boron-doped graphitized materials, which were selected in connection with the market demand and trend of Li-ion secondary batteries. The basic scientific study on carbons can contribute to further developments of the Li-ion secondary batteries, such as polymer battery for consumer electronics, multimedia technology and even for future hybrid and electric vehicles.View full abstractDownload PDF (6064K) -
Chiaki Ishii, Katsumi Kaneko2000 Volume 2000 Issue 193 Pages 218-222
Published: July 30, 2000
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe brief explanations on the relationship between the atomic structure and magnetism of various carbon materials such as graphite, fullerene, nanotube, and amorphous carbon were given in order to show the characteristic structure and magnetism of activated mesocarbon microbeads (a-MCMB). a-MCMB which has a greater surface area than 2630m2·g-1 has a highly isolated-nanographitic structure. This a-MCMB shows an anomalous random magnetism having a long relaxation time.View full abstractDownload PDF (730K) -
1. Basis of Electrochemical Analysis and Cyclic VoltammetrySoshi Shiraishi2000 Volume 2000 Issue 193 Pages 223-227
Published: July 30, 2000
Released on J-STAGE: June 28, 2010
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Yoshihiro Hishiyama2000 Volume 2000 Issue 193 Pages 228-231
Published: July 30, 2000
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (1911K) -
[in Japanese]2000 Volume 2000 Issue 193 Pages 234
Published: July 30, 2000
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (157K) -
[in Japanese], [in Japanese], [in Japanese]2000 Volume 2000 Issue 193 Pages 235-236
Published: July 30, 2000
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (1652K) -
2000 Volume 2000 Issue 193 Pages 241
Published: 2000
Released on J-STAGE: March 01, 2011
JOURNAL FREE ACCESSDownload PDF (83K)
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