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Optically transparent superhydrophobic TEOS-derived silica films by surface silylation method

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Abstract

Optically transparent silica films were prepared at room temperature (~27°C) by keeping the molar ratio of TEOS:MeOH:H2O (0.001 M NH4F) constant at 1:19.29:6.20, respectively. A surface chemical modification of the films was done with alkylchlorosilanes at different concentrations from 0 to 1 vol. % and aging times varied from half to 2 h. The DMCS and TMCS surface modified silica films showed the static water contact angle of 146° and 162°, respectively. When the DMCS and TMCS modified films were cured at temperatures higher than 240 and 275°C, respectively, the films became superhydrophilic. Further, the humidity study was carried out at a relative humidity of 90% at 30°C temperature over 60 days. We characterized the water repellent silica films by Fourier transform infrared spectroscopy, scanning electron microscopy, atomic force microscopy, % of optical transmission, humidity tests and contact angle measurements.

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Acknowledgments

One of the authors Sanjay S. Latthe is grateful to University Grant Commission (UGC), New Delhi, Government of India, for providing “UGC Research Fellowship in Sciences for Meritorious Students”. The authors are grateful to the Department of Atomic Energy (DAE), Board of Research in Nuclear Sciences (BRNS), Mumbai, Government of India, for the financial support for this work through a major research project on “Aerogels and coatings” (No. 2007/37/18/BRNS).

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Authors and Affiliations

  1. Air Glass Laboratory, Department of Physics, Shivaji University, Kolhapur, Maharashtra, 416 004, India

    Sanjay S. Latthe & A. Venkateswara Rao

  2. Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama, 223-8522, Japan

    Hiroaki Imai

  3. Indore Centre, CSR, University Campus, Khandwa Road, Indore, Madhya Pradesh, 452 017, India

    V. Ganesan

  4. Laboratory of Catalysis in Organic Chemistry, LA CCO, UMR CNRS 6503, University of Poitiers, 86000, Poitiers, France

    Charles Kappenstein

Authors
  1. Sanjay S. Latthe
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  2. Hiroaki Imai
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  3. V. Ganesan
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  4. Charles Kappenstein
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  5. A. Venkateswara Rao
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Corresponding author

Correspondence to A. Venkateswara Rao.

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Latthe, S.S., Imai, H., Ganesan, V. et al. Optically transparent superhydrophobic TEOS-derived silica films by surface silylation method. J Sol-Gel Sci Technol 53, 208–215 (2010). https://doi.org/10.1007/s10971-009-2079-y

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  • DOI: https://doi.org/10.1007/s10971-009-2079-y

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