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Open AccessArticle

The Effect of Different Coupling Agents on Nano-ZnO Materials Obtained via the Sol–Gel Process

1
R&D National Institute for Chemistry and Petrochemistry-ICECHIM, 202 Spl. Independentei, 6th District, 060021 Bucharest, Romania
2
Institute of Physical Chemistry “Ilie Murgulescu” of the Romanian Academy, 202 Spl. Independentei, 6th District, 060021 Bucharest, Romania
3
Faculty of Applied Chemistry and Materials Science, Politehnica University of Bucharest, 1-7 Polizu Str., 1st District, 011061 Bucharest, Romania
4
Physical Chemistry Department, University of Bucharest, 4-12 Elisabeta Blvd., 1st District, 030118 Bucharest, Romania
*
Author to whom correspondence should be addressed.
Nanomaterials 2017, 7(12), 439; https://doi.org/10.3390/nano7120439
Received: 10 October 2017 / Revised: 27 November 2017 / Accepted: 8 December 2017 / Published: 12 December 2017
(This article belongs to the Special Issue Sol-Gel Preparation of Nanomaterials)
Hybrid nanomaterials based on zinc oxide were synthesized via the sol–gel method, using different silane coupling agents: (3-glycidyloxypropyl)trimethoxysilane (GPTMS), phenyltriethoxysilane (PhTES), octyltriethoxysilane (OTES), and octadecyltriethoxysilane (ODTES). Morphological properties and the silane precursor type effect on the particle size were investigated using dynamic light scattering (DLS), environmental scanning electron microscopy (ESEM), transmission electron microscopy (TEM), thermogravimetric analysis (TGA), and X-ray diffraction (XRD). The bonding characteristics of modified ZnO materials were investigated using Fourier transform infrared spectroscopy (FTIR). The final solutions were deposited on metallic substrate (aluminum) in order to realize coatings with various wettability and roughness. The morphological studies, obtained by ESEM and TEM analysis, showed that the sizes of the ZnO nanoparticles are changed as function of silane precursor used in synthesis. The thermal stability of modified ZnO materials showed that the degradation of the alkyl groups takes place in the 300–500 °C range. Water wettability study revealed a contact angle of 142 ± 5° for the surface covered with ZnO material modified with ODTES and showed that the water contact angle increases as the alkyl chain from the silica precursor increases. These modified ZnO materials, therefore, can be easily incorporated in coatings for various applications such as anti-corrosion and anti-icing. View Full-Text
Keywords: sol–gel process; ZnO nanoparticles; coupling agent; surface modifications; hybrid coating sol–gel process; ZnO nanoparticles; coupling agent; surface modifications; hybrid coating
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Purcar, V.; Şomoghi, R.; Niţu, S.G.; Nicolae, C.-A.; Alexandrescu, E.; Gîfu, I.C.; Gabor, A.R.; Stroescu, H.; Ianchiş, R.; Căprărescu, S.; Cinteză, L.O. The Effect of Different Coupling Agents on Nano-ZnO Materials Obtained via the Sol–Gel Process. Nanomaterials 2017, 7, 439.

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