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Effect of microstructure and surface roughness on the wettability of superhydrophobic sol–gel nanocomposite coatings

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Abstract

Sol–gel nanocomposite coatings were fabricated by spraying precursor mixtures containing hydrophobically modified silica (HMS) nanoparticles dispersed in sol–gel matrices prepared with acid-catalyzed tetraethoxysilane (TEOS), and methyltriethoxysilane (MTEOS). The hydrophobicity of the coatings increased with increase in the concentration of HMS nanoparticles. Superhydrophobic coatings with water contact angle (WCA) of 166° and roll-off angle <2° were obtained by optimizing the sol–gel processing parameters and the concentration of silica nanoparticles in the coating. FESEM studies have shown that surface has a micro-nano binary structure composed of microscale bumps and craters with protrusions of nanospheres. The properties of composite coatings fabricated by spin coating and spray coating methods were compared. It was found that the microstructure and the wettability were also dependent on the method of application of the coating.

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Acknowledgments

We are grateful to Dr. A.R. Upadhya, Director, NAL, Bangalore, Dr. Kota Harinarayana, Raja Ramanna Fellow, NAL and Dr. K.S. Rajam, Head, Surface Engineering Division, NAL for their constant support and encouragement of this work. We wish to thank Metrology Division, NAL for surface profile measurements and Mr. Siju for technical assistance with FESEM studies.

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Authors and Affiliations

  1. Surface Engineering Division, National Aerospace Laboratories, Council of Scientific and Industrial Research (CSIR), Bangalore, 560017, India

    Bharathibai J. Basu, V. Hariprakash, S. T. Aruna, R. V. Lakshmi, J. Manasa & B. S. Shruthi

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  1. Bharathibai J. Basu
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  2. V. Hariprakash
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  3. S. T. Aruna
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  4. R. V. Lakshmi
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Correspondence to Bharathibai J. Basu.

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Basu, B.J., Hariprakash, V., Aruna, S.T. et al. Effect of microstructure and surface roughness on the wettability of superhydrophobic sol–gel nanocomposite coatings. J Sol-Gel Sci Technol 56, 278–286 (2010). https://doi.org/10.1007/s10971-010-2304-8

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  • DOI: https://doi.org/10.1007/s10971-010-2304-8

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