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Volume 77, Issue 2
Displaying 1-6 of 6 articles from this issue
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Yukinori NAGAO, Tomonori OOKI, Kozo KOZAWA2004 Volume 77 Issue 2 Pages 51-56
Published: February 20, 2004
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSProperties of silicon chelate complexes with 2, 2'-dihydroxy type azomethine dye ligand, such as absorption spectra, photovoltaic effect, etc., were investigated. These silicon chelate were insoluble in water and many of them were insoluble in common organic solvent, but all chelates showed excellent thermal resistance with decomposition temperature of above 300°C. In solution the silicon chelates with diethylamino substituted ligand of the azomethine dye showed considerable red-shifted absorption peak (λmax) and the molar absorption coefficient (ε) was about twice compared with other silicon chilates. In the measurement of current-voltage properties for the photocell of Au/silicon chelate/Al, diethylamino substituted chelates showed photovoltaic effect. These schottky cells of these chelates showed a rectification effect in the dark and photovoltaic effect under irradiation of white light. The photocurrent action spectra of these cells showed these silicon chelates to be p-type semiconductor.View full abstractDownload PDF (874K) -
Aritomo YAMAGUCHI, Masahito YOKOYAMA, Akane SUZUKI, Yasuhiro IWASAWA, ...2004 Volume 77 Issue 2 Pages 57-63
Published: February 20, 2004
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSZirconium-containing mesoporous silicas, Zr-MCM-41, were synthesized by two different methods. They were characterized by XRD, TEM, nitrogen adsorption and EXAFS and applied to the reaction for the peroxidative bromination of phenol red. In one method, we prepared Zr-MCM-41 by hydrolysis and condensation for the mixture of tetraethoxysilane (TEOS) and zirconium tetra-n-propoxide (ZTNP) in aqueous cetyltrimetylammonium bromide solution. EXAFS analysis revealed that zirconium species in this Zr-MCM-41 aggregated each other and formed the bonds of Zr-O-Zr. This catalyst had a low catalytic activity for the peroxidative bromination of phenol red. In the other method, ethanolic zirconium chloride solution and pure silica MCM-41 were used for impregnation. Zirconium species in this Zr-MCM-41 were highly dispersed as shown in the result of EXAFS analysis. This catalyst exhibited a high catalytic activity for the peroxidative bromination of phenol red. Zirconium species aggregated each other by calcination at 573 K, which caused reduction of catalytic activity.View full abstractDownload PDF (1090K) -
Takashi SUGIURA, Han Jin RYU, Satoshi YASUNO, Hideki MINOURA2004 Volume 77 Issue 2 Pages 64-68
Published: February 20, 2004
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSThe photoelectrochemical tailoring of polycrystalline titanium dioxide surface has been studied. Titanium dioxide is known to be highly resistive against photocorrosion. But in sulfuric acid aqueous solution, titanium dioxide itself reacts with photogenerated holes in competition with oxygen evolution, and it consequentry dissolves, which is called photoelectrochemical etching or simply photoetching. We have already reported that the photoetching of titanium dioxide led to unique surface structure depending upon the grain structure such as crystallographic orientations of the electrode and etching condition. The photoetching reaction proceeds along c-axis of the rutile structure of titanium dioxide to form “honeycomb” structure, of which size was several hundred nanometers, and the surface of its walls exposed had (100) crystallographic plane. In this study, we have found that increasing etching quantity has tended to develop a very thin and long rodlike structure at the surface, which has been named “nanorod” structure. SEM and TEM examinations of this surface have revealed that its diameter is several ten nanometers and its length is several tens micrometers. The large specific surface area and high crystallinity of the photoetched titanium dioxide make it an attractive material for photoelectronic devices.View full abstractDownload PDF (1458K) -
Hideki GODA2004 Volume 77 Issue 2 Pages 69-74
Published: February 20, 2004
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSDownload PDF (1191K) -
Complex of Precision Technology and Unit Operation of TechnologySHIZUKA SAKASHITA2004 Volume 77 Issue 2 Pages 75-85
Published: February 20, 2004
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSDownload PDF (1731K) -
Tomohiro KAMIJOH2004 Volume 77 Issue 2 Pages 86-90
Published: February 20, 2004
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSDownload PDF (1820K)
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