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

Cristian Petcu,Dan Donescu,Bogdan Trică,Raluca Şomoghi,Denis Mihaela Panaitescu,Sabina Georgiana Niţu,Maria-Luiza Jecu,Elvira Alexandrescu,Violeta Purcar,Cătălin-Ilie Spătaru

doi:10.3390/nano7020047

Cristian Petcu, Dan Donescu + Show 8 more

Open Access

PDF Available

https://doi.org/10.3390/nano7020047

Copy DOI

Export

Save

Cite

Abstract
Highlights/Summary
Full-Text PDF
Similar Papers

Abstract

Listen

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.

Highlights

To obtain highly hydrophobic surfaces, a large number of review-type studies have been designed.The main properties of highly hydrophobic surfaces are weak water adhesion and self-cleaning behavior in the presence of wetting phenomenon
Bilayer coatings on glass surfaces were fabricated using functionalized silica nanoparticles obtained by sol–gel process
Substitution with a shorter alkyl chain was characterized by a modified absorption maximum and a reduced intensity of the bands; methyl group substitution proved to have no significant absorption that could be observed in the mentioned wavelength domain

Summary

Introduction

To obtain highly hydrophobic surfaces, a large number of review-type studies have been designed.The main properties of highly hydrophobic surfaces are weak water adhesion and self-cleaning behavior in the presence of wetting phenomenon. From analysis of the published data, two approaches for obtaining hydrophobic surfaces from particles and binder were notable: mixing the two phases [8,9,10,11], or deposition of particles over films obtained from different film-forming procedures [12,13,14,15,16,17,18,19,20,21,22] In this way, the possibility of obtaining superhydrophobic surfaces (contact angle > 160◦ ) by mixing silica nanoparticles (SiO2 NPs) with a binder obtained from tetraethoxysilane (TEOS) and a fluorosilane (FAS) through acid-catalyzed sol–gel process were reported [8,9]. In the case of depositing SiO2 NPs over different supports, ultrahydrophobic surfaces were obtained by functionalizing the fillers with hydrocarbon chains [12,13,14,15]

Methods

Results

Conclusion