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Engineered organic/inorganic hybrids for superhydrophobic coatings by wet and vapour procedures

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Abstract

Siloxane/oxide hybrids have attracted growing attention thanks to their ability to modulate the surface energy, wettability, or self-lubricity of a material. Here, we compare two functionalisation procedures (chemical vapour deposition and wet impregnation) on substrate films composed by preformed oxide particles. Three kinds of particles, characterised by different natures (SiO2 and TiO2) and average particle size, were studied to highlight possible effects related to the chemical and morphological state of the substrate surface. Morphological characterisations were carried out using dynamic light scattering and scanning electron microscopy, while the structure of the hydrophobing layer was studied by combining Fourier transform infrared spectroscopy and solid-state nuclear magnetic resonance. The degree of functionalisation and the features of the siloxane layer vary significantly among the adopted oxides and functionalisation methods. The wettability features of the different hybrids closely mirror the results of the spectroscopic characterisations, giving rise to either Lotus leaf or patch-wise hydrophobic systems depending on the adopted conditions.

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Acknowledgements

This research has been supported by the University of Milan Research Funds (PUR).

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Authors and Affiliations

  1. Department of Chemistry, Università di Milano, Via Golgi 19, 20133, Milan, Italy

    Guido Soliveri, Daniela Meroni, Giuseppe Cappelletti, Rita Annunziata & Silvia Ardizzone

  2. Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali (INSTM), Via Giusti 9, 50121, Florence, Italy

    Guido Soliveri, Daniela Meroni, Giuseppe Cappelletti & Silvia Ardizzone

  3. Department of Chemistry IFM & NIS-Interdept, Excellence Centre, Università di Torino, via Pietro Giuria, 7, 10125, Turin, Italy

    Valentina Aina & Giuseppina Cerrato

Authors
  1. Guido Soliveri
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  2. Daniela Meroni
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  3. Giuseppe Cappelletti
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  4. Rita Annunziata
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  5. Valentina Aina
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  7. Silvia Ardizzone
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Correspondence to Daniela Meroni.

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10853_2013_7976_MOESM1_ESM.pdf

Online Resources: Assignments of 13C NMR resonanes; Fitting analysis of the 29Si NMR spectra of siloxane–TiO2 composites obtained using WI and CVD, and sketches of the structures attributed to the different resonances; Static contact angles for different solvents on the functionalised oxide samples

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Soliveri, G., Meroni, D., Cappelletti, G. et al. Engineered organic/inorganic hybrids for superhydrophobic coatings by wet and vapour procedures. J Mater Sci 49, 2734–2744 (2014). https://doi.org/10.1007/s10853-013-7976-3

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  • DOI: https://doi.org/10.1007/s10853-013-7976-3

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