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Bioactivity of wollastonite/aerogels composites obtained from a TEOS–MTES matrix

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Abstract

Organic–inorganic hybrid materials were synthesized by controlled hydrolysis of tetraethoxysilane (TEOS), methyltrimethoxysilane (MTES), synthetic wollastonite powders and polydimethylsiloxane (PDMS) in an ethanol solution. Aerogels were prepared from acid hydrolysis of TEOS and MTES with different volume ratio in ethanol, followed by addition of wollastonite powder and PDMS in order to obtain aerogels with 20 wt% of PDMS and 5 wt% of CaO of the total silica. Finally, when the wet gels were obtained, they were supercritically dried at 260 °C and 90 bar, in ethanol. In order to obtain its bioactivity, one method for surface activation is based on a wet chemical alkaline treatment. The particular interest of this study is that we introduce hybrid aerogels, in a 1 M solution of NaOH, for 30 s at room temperature. We evaluate the bioactivity of TEOS–MTES aerogel when immersed in a static volume of simulated body fluid (SBF). An apatite layer of spherical-shaped particles of uniform size smaller than 5 microns is observed to form on the surface of the aerogels after 25 days soaking in SBF.

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Acknowledgement

The authors express gratitude to the Spanish Ministerio de Educación y Ciencia and to 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 for this research. R. Mendoza-Serna is grateful to 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 Física de la Materia Condensada, Facultad de Ciencias, Universidad de Cádiz, Avenida República Saharaui, s/n, 11510, Puerto Real, Cadiz, Spain

    Jose Antonio Toledo-Fernández, Roberto Mendoza-Serna, Victor Morales & Nicolás de la Rosa-Fox

  2. Departamento de Física Aplicada, CASEM, Universidad de Cádiz, Puerto Real, Cadiz, Spain

    Manuel Piñero

  3. Departamento de Cristalografía y Mineralogía, CASEM, Universidad de Cádiz, 11510, Puerto Real, Cadiz, Spain

    Alberto Santos

  4. Departamento de Física de la Materia Condensada, Facultad de Física, Instituto de Ciencia de Materiales de Sevilla (CSIC), Universidad de Sevilla, Seville, Spain

    Luis Esquivias

Authors
  1. Jose Antonio Toledo-Fernández
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  2. Roberto Mendoza-Serna
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  3. Victor Morales
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  4. Nicolás de la Rosa-Fox
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  5. Manuel Piñero
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  6. Alberto Santos
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  7. Luis Esquivias
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Correspondence to Roberto Mendoza-Serna.

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Toledo-Fernández, J.A., Mendoza-Serna, R., Morales, V. et al. Bioactivity of wollastonite/aerogels composites obtained from a TEOS–MTES matrix. J Mater Sci: Mater Med 19, 2207–2213 (2008). https://doi.org/10.1007/s10856-007-3312-2

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  • DOI: https://doi.org/10.1007/s10856-007-3312-2

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