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Volume 2010 (2010)
- Issue 245 Pages 183-
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- Issue 243 Pages 93-
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Volume 2010, Issue 245
Displaying 1-7 of 7 articles from this issue
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Research Papers
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Osamu Yamamoto, Masayuki FukudaArticle type: Research Papers
2010 Volume 2010 Issue 245 Pages 183-187
Published: November 15, 2010
Released on J-STAGE: December 21, 2010
JOURNAL FREE ACCESSThe in vitro biocompatibility of a novel carbon-coated titanium implant (CTi), fabricated by heating a poly(vinyl) alcohol (PVA)-coated titanium disk at 700°C in argon gas, was investigated. The obtained CTi possessed a surface layer of anatase–TiO2 covered by amorphous carbon about 20 nm thick. In order to establish the effectiveness of the CTi as one of the implant materials, in vitro tests using human bone marrow-derived mesenchymal cells (hBMCs) were performed to check cytotoxicity, by examining cell proliferation, cell differentiation and mineralization capability. After 10 days of culture a higher degree of cell viability was observed on the surface of CTi. On the other hand, hBMCs cultured in direct contact with CTi continued to show alkaline phosphatase activity (ALP) and showed mineralization similar to the control cultures. These results indicated that the titanium coated with carbon possessed better biological response than that without carbon, which was demonstrated by the higher proliferation rates of osteoblasts, higher osteo differentiation and higher mineralization ability.View full abstractDownload PDF (353K) -
Tomokazu Fukutsuka, Fumihiro Sagane, Kohei Miyazaki, Takeshi Abe, Tomo ...Article type: Research Papers
2010 Volume 2010 Issue 245 Pages 188-191
Published: November 15, 2010
Released on J-STAGE: December 21, 2010
JOURNAL FREE ACCESSA carbonaceous thin-film electrode was prepared by plasma-assisted chemical vapor deposition, and used as a model carbon electrode to study the interfacial reactions between a electrode and electrolyte. Lithium-ion transfer at the interface between carbonaceous thin-film electrode and electrolyte was studied by electrochemical impedance spectroscopy. In the Nyquist plots, semi-circles assigned to charge-transfer resistance were observed in high frequency region. Activation energies for lithium-ion transfer at the interface between carbonaceous thin-film electrode and electrolyte were evaluated, and the values were found to be dependent on the electrolyte solutions. The effects of ion-solvent interaction on the activation energies for the interfacial lithium-ion transfer are discussed based on theoretical calculations.View full abstractDownload PDF (168K)
Notes
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Yoshimi Ohzawa, Takumi Okabe, Takahiro Kasugai, Tsuyoshi NakajimaArticle type: Notes
2010 Volume 2010 Issue 245 Pages 192-195
Published: November 15, 2010
Released on J-STAGE: December 21, 2010
JOURNAL FREE ACCESSUsing the pressure-pulsed chemical vapor deposition (PCVD) technique, pyrolytic carbon (pyrocarbon) was deposited at 800°C from a C3H8 (30%)–N2 gas system on a carbon paper substrate carbonized at 800°C. The XRD results revealed that the crystallinity of the pyrocarbon was higher than that of the carbon paper. The BET surface area decreased from 361 m2 g−1 for the original substrate to 2.3 m2 g−1 for the pyrocarbon-coated sample. A high irreversible capacity of 550 mA h g−1 was observed for the original carbonized paper, reflecting the disordered structure and high surface area. This irreversible capacity was reduced to 150 mA h g−1 by coating with 8 mass% pyrocarbon, which could be attributed to the high crystallinity and low surface area of the pyrocarbon. The reversible capacity of the sample coated with 8 mass% pyrocarbon was 597 mA h g−1, which was higher than that of the original carbon paper.View full abstractDownload PDF (485K) -
Junya Yamashita, Masatoshi Shioya, Hiroaki Hatori, Masaya KodamaArticle type: Notes
2010 Volume 2010 Issue 245 Pages 196-199
Published: November 15, 2010
Released on J-STAGE: December 21, 2010
JOURNAL FREE ACCESSThe carbonization behavior of benzimidazobenzophenanthroline ladder (BBL) polymer films has been investigated in comparison with those of polyoxadiazole (POD) and polyimide (PI) films. BBL polymer films could be carbonized while maintaining the smooth surface, whereas the surface of POD and PI films became uneven due to the formation of kinks and bumps, respectively. The carbonization yields of BBL polymer, POD and PI films at 2500°C were 64.1, 25.5 and 51.9%, respectively. Like POD- and PI-based carbon films, the carbon crystallites in BBL polymer-based carbon films were preferentially oriented so that the carbon layers are parallel to the film surface.View full abstractDownload PDF (316K)
Review Papers
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Yoshiaki MatsuoArticle type: Review Papers
2010 Volume 2010 Issue 245 Pages 200-205
Published: November 15, 2010
Released on J-STAGE: December 21, 2010
JOURNAL RESTRICTED ACCESSRecent studies on the preparation and properties of carbon thin films from the dispersion of graphite oxides or organically modified graphite oxides are summarized. Silylated graphite oxide was well dispersed in an organic solvent when nhexadecylamine was intercalated into it and thin film samples were obtained from the resulting nanosheet solutions. The interlayer spacing of the silylated graphite oxide thin films reached 1.22 nm after reduction by hydrazine and their electrical nature changed from insulating to semi-conducting. Transparent and conducting carbon films which adhered well to glass substrates were obtained from the pyrolysis of silylated graphite oxide thin films. The sheet resistance of the carbon film obtained from the pyrolysis of silylated graphite oxide at 900°C reached 700 Ω/sq. When graphite oxide thin films were heated at 300°C, carbon films with a large interlayer spacing of 0.42 nm was obtained. Considerable amounts of hydrogen were electrochemically stored in this carbon film, accompanied by an increase of interlayer spacing by 0.03 nm.View full abstractDownload PDF (1387K) -
Hiroyuki HanyuArticle type: Review Papers
2010 Volume 2010 Issue 245 Pages 206-210
Published: November 15, 2010
Released on J-STAGE: December 21, 2010
JOURNAL RESTRICTED ACCESSDiamond has been used for many kinds of applications because of its excellent mechanical characteristics. When diamond is used for the coating on cutting tools to be used under severe conditions, however, there were problems of sudden debonding and chipping of the coatings, which were caused by the poor adhesion of diamond. In this paper, the development story of diamond coated cutting tools, and the advanced machining process achieved by our diamond coated cutting tools are presented.View full abstractDownload PDF (1258K) -
Yoshimi Ohzawa, Masayuki Kawaguchi, Tomokazu FukutsukaArticle type: Review Papers
2010 Volume 2010 Issue 245 Pages 211-221
Published: November 15, 2010
Released on J-STAGE: December 21, 2010
JOURNAL RESTRICTED ACCESSThere are many methods for the preparation of a carbon-based thin film, resulting in a variety structures and characteristics. Chemical vapor deposition (CVD) methods have been have been particularly important for their preparation. In this review of various CVD methods, chemical vapor infiltration, low pressure CVD, and plasma-assisted CVD methods are covered. Preparation methods, structures and properties of the carbon-based thin films produced, and their application to functional devices such as lithium-ion batteries are described.View full abstractDownload PDF (1238K)
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