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Effect of external fields applied during hot-water treatment on the aspect ratio of nanocrystallites formed on SiO2·TiO2 coatings derived from sol–gel techniques

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Abstract

SiO2·TiO2 coatings were prepared by a sol–gel route. The effect of the external fields including mechanical vibration and electric charge applied during hot-water treatment on titania precipitation at the surface of the coatings was investigated. The shape of the resulting precipitates tended to elongate by applying vibration in a parallel or perpendicular direction, or by applying an electric charge. The organization of titania nanocrystallites possibly occurs because of the concentration gradient of dissolved titania species generated by the external fields during the hot-water treatment. A maximum aspect ratio of 38.1 was achieved for the precipitate prepared by hot-water treatment performed under parallel vibration for 5 h. The shape of the resulting precipitates was also influenced by the content of TiO2 in the SiO2·TiO2 coating, with a smaller proportion of TiO2 increasing the aspect ratio of the resulting precipitate.

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Acknowledgments

This work was partially funded by the Japan Society for the Promotion of Science (JSPS) (Grant-in-Aid for Scientific Research (B) No. 20360268). N.P. acknowledges ASEAN University Network/Southeast Asia Engineering Education Development Network (AUN/SEED-Net) and Japan International Cooperation Agency (JICA) for supporting his PhD study at Toyohashi University of Technology.

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Authors and Affiliations

  1. Department of Environmental and Life Sciences, Toyohashi University of Technology, Toyohashi, Japan

    Niki Prastomo, Kouji Kimata, Hiroyuki Muto, Mototsugu Sakai & Atsunori Matsuda

  2. Department of Materials Science and Chemistry, University of Hyogo, Kobe, Japan

    Yusuke Daiko

  3. Department of Electrical and Electronic Information Engineering, Toyohashi University of Technology, Toyohashi, Japan

    Hiroyuki Muto, Mototsugu Sakai & Atsunori Matsuda

  4. Department of Earth and Planetary Science, The University of Tokyo, Tokyo, Japan

    Toshihiro Kogure

Authors
  1. Niki Prastomo
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  2. Kouji Kimata
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  3. Yusuke Daiko
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  4. Hiroyuki Muto
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  5. Toshihiro Kogure
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  6. Mototsugu Sakai
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  7. Atsunori Matsuda
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Correspondence to Atsunori Matsuda.

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Prastomo, N., Kimata, K., Daiko, Y. et al. Effect of external fields applied during hot-water treatment on the aspect ratio of nanocrystallites formed on SiO2·TiO2 coatings derived from sol–gel techniques. J Sol-Gel Sci Technol 56, 345–352 (2010). https://doi.org/10.1007/s10971-010-2312-8

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  • DOI: https://doi.org/10.1007/s10971-010-2312-8

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