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Preparation of hollow titania and strontium titanate spheres using sol–gel derived silica gel particles as templates

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Abstract

A facile approach, based on polyelectrolyte-mediated electrostatic adsorption of a water-soluble titanium complex on colloidal templates and hydrothermal treatment, is presented for the formation of hollow titania (TiO2) and strontium titanate (SrTiO3) spheres. Monodispersed silica gel particles were prepared by the sol–gel method and adopted as core templates. Deposition of a water-soluble titanium complex, titanium (IV) bis(ammoniumlactato)dihydroxide (TALH), on the silica gel particles was carried out via the layer-by-layer assembly technique. Hollow spheres were successfully formed from the core–shell particles. The silica gel particles used as core templates dissolved during hydrothermal treatment because of the particles’ undeveloped siloxane network. In addition, the hydrothermal treatment induced crystallization of the hollow shells. Therefore, the hydrothermal treatment played two roles; removal of the silica templates and crystallization of the hollow shells. When deionized water was used, hollow TiO2 spheres were obtained. Hollow SrTiO3 spheres could also be formed when an aqueous solution of Sr(OH)2 was used. The approach presented here could be exploited as a novel and sustainable approach for the fabrication of a range of different inorganic hollow spheres.

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Acknowledgment

This work was supported by Grant-in-Aid for Scientific Research (No. 22107011) on the Innovative Areas: “Fusion Materials” (Area No. 2206) from the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan.

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Authors and Affiliations

  1. Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima, 739-8527, Japan

    Kiyofumi Katagiri & Kei Inumaru

  2. Department of Applied Chemistry, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8603, Japan

    Kiyofumi Katagiri, Jumpei Kamiya & Kunihito Koumoto

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  1. Kiyofumi Katagiri
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  2. Jumpei Kamiya
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  3. Kunihito Koumoto
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  4. Kei Inumaru
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Correspondence to Kiyofumi Katagiri.

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Katagiri, K., Kamiya, J., Koumoto, K. et al. Preparation of hollow titania and strontium titanate spheres using sol–gel derived silica gel particles as templates. J Sol-Gel Sci Technol 63, 366–372 (2012). https://doi.org/10.1007/s10971-012-2795-6

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  • DOI: https://doi.org/10.1007/s10971-012-2795-6

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