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Improvement of the bioactivity of organic–inorganic hybrid aerogels/wollastonite composites with TiO2

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Abstract

Organic–inorganic hybrid aerogels containing P and Ti have been synthesized by supercritical drying of alkogels prepared by hydrolysis and poly-condensation of metalo-organic precursors under high-power ultrasound. These materials become bioactive when doped with Ca. Wollastonite particles (CaSiO3) were added as an active phase, instead of incorporating Ca into the aerogel atomic network. These particles had previously been precipitated and were then added to the sol. The aerogels were studied by Fourier transform infrared analysis, scanning electron microscopy coupled with energy dispersive spectroscopy and X-ray diffraction and N2 adsorption. The stress–strain behaviours were evaluated under compression to obtain the Young’s modulus. It was found that the incorporation of TiO2 into wollastonite-P2O5 hybrid aerogels increased their capacity to form apatite and, consequently, improving their bioactive response.

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Acknowledgements

The authors are grateful to the Spanish Ministerio de Educación y Ciencia and the Consejería de Innovación Ciencia y Empresa of the Junta de Andalucía (Spain) (Projects MAT2005-01583 and TEP 790, respectively), for the financial support provided. R. Mendoza-Serna thanks the U.N.A.M., DGAPA, México, for the scholarship supporting his sabbatical stay at the Departamento de Física de la Materia Condensada, Facultad de Ciencias, Universidad de Cádiz.

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Authors and Affiliations

  1. Departamento de Física de la Materia Condensada, Facultad de Ciencias, Universidad de Cádiz, Cadiz, Spain

    J. A. Toledo Fernández, R. Mendoza-Serna & N. de la Rosa-Fox

  2. Departamento de Cristalografía y Mineralogía. CASEM, Universidad de Cádiz, Cadiz, Spain

    A. Santos

  3. Departamento de Física Aplicada, CASEM, Universidad de Cádiz, Cadiz, Spain

    M. Piñero

  4. Departamento de Física de la Materia Condensada, Facultad de Física, Instituto de Ciencia de Materiales de Sevilla (CSIC), Universidad de Sevilla, Avenida Reina Mercedes, s/n, 41012 , Sevilla, Spain

    L. Esquivias

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  1. J. A. Toledo Fernández
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  2. R. Mendoza-Serna
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  3. A. Santos
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  4. M. Piñero
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  5. N. de la Rosa-Fox
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  6. L. Esquivias
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Correspondence to L. Esquivias.

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Toledo Fernández, J.A., Mendoza-Serna, R., Santos, A. et al. Improvement of the bioactivity of organic–inorganic hybrid aerogels/wollastonite composites with TiO2 . J Sol-Gel Sci Technol 45, 261–267 (2008). https://doi.org/10.1007/s10971-007-1674-z

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  • DOI: https://doi.org/10.1007/s10971-007-1674-z

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