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Preparation of superhydrophobic silica nanoparticles by microwave assisted sol–gel process

Abstract

Hydrophobic silica nanoparticles were obtained by microwave assisted sol–gel method using a two-step procedure. In the first step different size silica particles were generated from tetraethyl orthosilicate and in the second one the silica particles were hydrophobized using hexadecyl trimethoxysilane (HDTMOS). Under microwave irradiation, high conversion degrees were obtained at relatively short reaction times. The HDTMOS added in the second step instead of coating the silica nanoparticles generated new ones and therefore the final product showed a bimodal size distribution. All the synthesized nanoparticles gave rise to high water contact angles (≈150°) and low hysteresis values.

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Acknowledgments

The authors would like to thank the financial support of the Basque Government (Etortek, iNanogune II project, and Ayudas a grupos de investigación del sistema universitario vasco ITT444-10) for the development of this work.

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Correspondence to L. Irusta.

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Santiago, A., González, A., Iruin, J.J. et al. Preparation of superhydrophobic silica nanoparticles by microwave assisted sol–gel process. J Sol-Gel Sci Technol 61, 8–13 (2012). https://doi.org/10.1007/s10971-011-2583-8

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  • DOI: https://doi.org/10.1007/s10971-011-2583-8

Keywords

  • Superhydrophobic silica
  • Microwave
  • Nanoparticles