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Volume 2002 (2002)
- Issue 205 Pages 221-
- Issue 204 Pages 159-
- Issue 203 Pages 113-
- Issue 202 Pages 71-
- Issue 201 Pages 2-
Volume 2002, Issue 203
Displaying 1-10 of 10 articles from this issue
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Hidetaka Konno, Keiko Fujita, Hiroki Habazaki, Michio Inagaki2002 Volume 2002 Issue 203 Pages 113-116
Published: July 25, 2002
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSGraphite crystals were formed from a mixture of poly (vinyl pyrrolidone) (PVP) or polyacrylamide (PAA) pow-der and magnetite powder at 1150-1200°C. The graphite was identified by X ray diffraction and transmission elec-tron microscopy. The carbon yield from PAA at 1200°C was about four times of that from PVP, but PAA needed pro-longed heat treatment to transform turbostratic carbon to graphite. The graphite formation with magnetite from hard-carbon precursors (PVP and PAA) required higher temperatures and longer treatment time than with magnetite and soft-carbon precursors, such as poly (vinyl chloride) (PVC) and poly (vinyl alcohol) (PVA). Electron microscopic observations suggested that in addition to a carbide mechanism, a dissolution-precipitation mechanism may also take part in the graphitization of carbon derived from PVP and PAA.View full abstractDownload PDF (5301K) -
Yasuhiro Tanabe, Hajime Ishii, Shin Nakanishi, Takashi Akatsu, Eiichi ...2002 Volume 2002 Issue 203 Pages 117-119
Published: July 25, 2002
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSTo measure inter laminar shear strength (ILSS) of C/C composites at high temperatures, a graphite jig was developed on double notched specimen configuration. ILSS of unidirectional C/C composites and 0/90 cross-ply of C/C composites (HTT2000°C and 3000°C in both composites) were measured using the assembly up to 1500°C. In all tests, the shear load showed a liner increase after the initial stage of the loading. The assembly developed was satisfactorily used to measure the ILSS of the C/C composites at high temperatures. All specimens showed catastrophic fracture, and the ILSS largely increased with testing temperature, at least, above 1250°C. In C/C composites, relationships between ILSS and testing temperature seem to depend not on orientation configuration of their reinforcement but on their heat-treatment temperature.View full abstractDownload PDF (475K) -
Hiroshi Shioyama2002 Volume 2002 Issue 203 Pages 120-122
Published: July 25, 2002
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSHalogens were allowed to react with potassium-graphite intercalation compounds (K-GICs). By the reaction with chlorine, K-GICs were decomposed, and hence the increase of stage number was observed. As chlorine is known not to intercalate into graphite, the interaction of potassium with chlorine was taken place on the sample surface. The decomposition by chlorobenzene and benzoyl bromide was observed in a similar way. When ICl or IBr was used as a reagent, intercalation of the reagent was observed. The products of K-GICs and IBr systems suggest a reaction mech-anism of the decomposition of K-GIC and the subsequent intercalation of IBr.View full abstractDownload PDF (431K) -
Yohko Hanzawa, Naoya Miyajima, Hiroaki Hatori, Yoshio Yamada2002 Volume 2002 Issue 203 Pages 123-126
Published: July 25, 2002
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSActivated carbon fibers (ACFs) were modified using an oxidation reagent and a surface coupling reagent. Liquid phase oxidation reduced pore width and micropore volume due to the introduction of acidic functional groups, while the change in pore width was negligibly small by the addition of long hydrocarbon chains using the coupling reagent. The introduction of acidic functional groups as well as the long hydrocarbon chains lowered the methane adsorption ability of ACFs. However, the change in a parameter of extended DR equation, saturated vapor pressure of the quasi-vaporized supercritical methane, caused by the surface modification was similar to that by MgO dispersion which enhances the methane adsorption abilityView full abstractDownload PDF (576K) -
Kenji Seki2002 Volume 2002 Issue 203 Pages 127-135
Published: July 25, 2002
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSAdsorptive storage is the most promising low-pressure alternative for natural gas storage. The possibility of an adsorptive natural gas (ANG) storage system was studied for applications such as a gas holder. This application has more merits as a storage system than one of vehicle due to lower pressure storage. This paper examines the cyclic adsorption-desorption behavior of natural gas and odorants, the impact of adsorption and desorption temperature [NOT HEAT] of natural gas on the storage capacity, and the composition of the desorbed gas in a large scale test. Results illustrated that the initial cost and site area of gas supply equipment using adsorbents was lower and smaller than that of compressed natural gas (CNG) storage under the same condition. Furthermore the new storage system equipped with two adsorption beds and back pressure valve was designed to improve the ratio of degradation by accumulation of heavy hydrocarbon. It was demonstrated that this storage system was effective for ANG storage and had 1.3 to 1.6 times greater storage capacity than that of the conventional ANG storage equipped with one bed.View full abstractDownload PDF (1422K) -
Zempachi Ogumi, Takeshi Abe, Minoru Inaba, Soon Ki Jeong2002 Volume 2002 Issue 203 Pages 136-140
Published: July 25, 2002
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSIn lithium ion batteries, graphite and graphitized carbonaceous materials have been mainly used as negative elec-trodes because of their acceptable high capacity, very flat potential as low as Li metal, etc. One of the problems for graphite negative electrode is irreversible capacity due to electrolyte decomposition and subsequent formation of sur-face film (solid electrolyte interphase, SEI) in the initial stage of charge and discharge cycling. And hence much effort has been devoted to the evaluation of formation mechanism of SEI films. Here we described the brief explana-tion of graphite negative electrode for lithium ion batteries and explained the correlation between SEI film formation on graphite electrode and solvated lithium ion intercalation of graphite.View full abstractDownload PDF (2368K) -
Hideaki Sane, Yasuo Uchiyama2002 Volume 2002 Issue 203 Pages 141-149
Published: July 25, 2002
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (1585K) -
[in Japanese]2002 Volume 2002 Issue 203 Pages 150
Published: July 25, 2002
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (220K) -
[in Japanese]2002 Volume 2002 Issue 203 Pages 151
Published: July 25, 2002
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (245K) -
2002 Volume 2002 Issue 203 Pages 155
Published: July 25, 2002
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (140K)
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