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Hot-water treatment of sol–gel derived SiO2–TiO2 microparticles and application to electrophoretic deposition for thick films

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Abstract

SiO2–TiO2 spherical microparticles of about 0.7 μm in diameter were prepared by the sol–gel method. Anatase nanocrystals were formed in the microparticles and their specific surface area was increased after a hot-water treatment at 90 °C. From the changes in the concentration of I2 photocatalytically generated from KI aqueous solution, the activity of the SiO2–TiO2 microparticles was found to increase with increasing the hot-water treatment time. Particulate, thick films were electrophoretically deposited on indium tin oxide (ITO)-coated glass substrates using the anatase nanocrystal-precipitated SiO2–TiO2 microparticles. The thickness of the electrophoretically deposited particulate film increased to be approximately 10 μm with an increase in applied voltage. The resultant thick film showed a high photocatalytic activity.

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Acknowledgements

This work was partly supported by The Japan Society for the Promotion of Science (Grants-in-Aid for Scientific Research No. 16360327(B)), Tatematsu Foundation, Izumi Science and Technology Foundation, and Hosokawa Powder Technology Foundation. The authors thank Professor Tsutomu Minami of Osaka Prefecture University and Professor Mototsugu Sakai of Toyohashi University of Technology for their continuous encouragement and guidance. They also thank Professor Toshihiro Kogure of The University of Tokyo for TEM observations.

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Authors and Affiliations

  1. Department of Materials Science, Toyohashi University of Technology, Toyohashi, Aichi, 441-8580, Japan

    Atsunori Matsuda

  2. Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, Sakai, Osaka, 599-8531, Japan

    Yugo Higashi, Kiyoharu Tadanaga & Masahiro Tatsumisago

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  1. Atsunori Matsuda
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  2. Yugo Higashi
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  3. Kiyoharu Tadanaga
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  4. Masahiro Tatsumisago
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Correspondence to Atsunori Matsuda.

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Matsuda, A., Higashi, Y., Tadanaga, K. et al. Hot-water treatment of sol–gel derived SiO2–TiO2 microparticles and application to electrophoretic deposition for thick films. J Mater Sci 41, 8101–8108 (2006). https://doi.org/10.1007/s10853-006-0419-7

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  • DOI: https://doi.org/10.1007/s10853-006-0419-7

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