Siloxane/oxide hybrids have attracted growing attention thanks to their ability to modulate the surface energy, wettability, or self-lubricity of a material. Their application areas range from self-cleaning surfaces to anti-fouling coatings, from advanced patterning techniques to microfluidics diffusion. Although a growing number of applications concerns the functionalisation of several kinds of oxide nanoparticles, most of the literature studies deal with liquid phase functionalisation of SiO2 surfaces. Here, we compare two functionalisation procedures (chemical vapour deposition and wet impregnation) on substrate films composed by preformed oxide particles. Three different kinds of particles, characterized by different nature (SiO2 and TiO2) and average particle size (micro/nanosized), were employed to highlight possible effects related to the chemical and morphological state of the substrate surface. The structure of the hydrophobing layer was studied by combining Fourier Transform Infrared (FTIR) spectroscopy and solid state Nuclear Magnetic Resonance (NMR). Morphological characterizations were carried out by dynamic light scattering (DLS) and scanning electron microscopy (SEM). Large differences in the degree of functionalisation and in the features of the siloxane layer are appreciable among the adopted oxides and functionalisation methods. The wettability features of the different hybrids closely mirror the results of the spectroscopic characterizations, giving rise to either Lotus leaf or patch-wise hydrophobic systems depending on the adopted conditions.

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

AINA, VALENTINA;CERRATO, Giuseppina;
2014

Abstract

Siloxane/oxide hybrids have attracted growing attention thanks to their ability to modulate the surface energy, wettability, or self-lubricity of a material. Their application areas range from self-cleaning surfaces to anti-fouling coatings, from advanced patterning techniques to microfluidics diffusion. Although a growing number of applications concerns the functionalisation of several kinds of oxide nanoparticles, most of the literature studies deal with liquid phase functionalisation of SiO2 surfaces. Here, we compare two functionalisation procedures (chemical vapour deposition and wet impregnation) on substrate films composed by preformed oxide particles. Three different kinds of particles, characterized by different nature (SiO2 and TiO2) and average particle size (micro/nanosized), were employed to highlight possible effects related to the chemical and morphological state of the substrate surface. The structure of the hydrophobing layer was studied by combining Fourier Transform Infrared (FTIR) spectroscopy and solid state Nuclear Magnetic Resonance (NMR). Morphological characterizations were carried out by dynamic light scattering (DLS) and scanning electron microscopy (SEM). Large differences in the degree of functionalisation and in the features of the siloxane layer are appreciable among the adopted oxides and functionalisation methods. The wettability features of the different hybrids closely mirror the results of the spectroscopic characterizations, giving rise to either Lotus leaf or patch-wise hydrophobic systems depending on the adopted conditions.
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wettability; silica; Titania; siloxane; CVD growth; solid state NMR
Guido Soliveri; Daniela Meroni; Giuseppe Cappelletti; Rita Annunziata; Valentina Aina; Giuseppina Cerrato; Silvia Ardizzone
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2318/141622
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