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Nanomaterials 2017, 7(2), 47; doi:10.3390/nano7020047

The Influence of New Hydrophobic Silica Nanoparticles on the Surface Properties of the Films Obtained from Bilayer Hybrids

R & D National Institute for Chemistry and Petrochemistry—ICECHIM, Polymers Department, Spl. Independentei 202, 6th District, 060021 Bucharest, Romania
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Academic Editors: Xianghui Hou and Fang Xu
Received: 3 November 2016 / Revised: 13 February 2017 / Accepted: 16 February 2017 / Published: 20 February 2017
(This article belongs to the Special Issue Nanocomposite Coatings)
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Abstract

Ultra-hydrophobic bilayer coatings on a glass surface were fabricated by sol–gel process using hexadecyltrimethoxysilane (C16TMS) and tetramethoxysilane (TMOS) (1:4 molar ratio) as precursors. After coating, silica nanoparticles (SiO2 NPs) functionalized with different mono-alkoxy derivatives (methoxytrimethylsilane, TMeMS; ethoxydimethylvinylsilane, DMeVES; ethoxydimethylphenylsilane, DMePhES; and methoxydimethyloctylsilane, DMeC8MS) were added, assuring the microscale roughness on the glass surface. Influences of the functionalized SiO2 NPs and surface morphology on the hydrophobicity of the hybrid films were discussed. The successful functionalization of SiO2 NPs with hydrophobic alkyl groups were confirmed by Fourier transform infrared spectroscopy (FTIR). The thermal stability of hydrophobic SiO2 NPs showed that the degradation of the alkyl groups takes place in the 200–400 °C range. Bilayer coating with C16TMS/TMOS and SiO2 NPs modified with alkoxysilane substituted with C8 alkyl chain (SiO2 NP-C8) has micro/nano structure. Hydrophobicity of functionalized SiO2 NPs-C8 and its higher degree of nanometer-scale roughness gave rise to ultra-hydrophobicity performance for bilayer coating C16TMS/TMOS + SiO2 NPs-C8 (145°), compared to other similar hybrid structures. Our synthesis method for the functionalization of SiO2 NPs is useful for the modification of surface polarity and roughness. View Full-Text
Keywords: sol–gel process; silica nanoparticles; nanostructuration; organic–inorganic hybrids; trialkylmonoalkoxysilanes sol–gel process; silica nanoparticles; nanostructuration; organic–inorganic hybrids; trialkylmonoalkoxysilanes
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MDPI and ACS Style

Petcu, C.; Purcar, V.; Spătaru, C.-I.; Alexandrescu, E.; Şomoghi, R.; Trică, B.; Niţu, S.G.; Panaitescu, D.M.; Donescu, D.; Jecu, M.-L. The Influence of New Hydrophobic Silica Nanoparticles on the Surface Properties of the Films Obtained from Bilayer Hybrids. Nanomaterials 2017, 7, 47.

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