Effect of Chemical Composition on Microstructure and Hydrophobic Properties of SiO2-TiO2@PDMS Coating

Sazvar, amirreza; Alavi, Seyed mohammad saeed; Sarpoolaky, hossein

doi:10.22068/ijmse.3114

Volume 20, Issue 2 (June 2023) IJMSE 2023, 20(2): 1-11 | Back to browse issues page

‎ 10.22068/ijmse.3114

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Sazvar A, Alavi S M S, Sarpoolaky H. Effect of Chemical Composition on Microstructure and Hydrophobic Properties of SiO2-TiO2@PDMS Coating. IJMSE 2023; 20 (2) :1-11
URL: http://ijmse.iust.ac.ir/article-1-3114-en.html

Effect of Chemical Composition on Microstructure and Hydrophobic Properties of SiO2-TiO2@PDMS Coating

Amirreza Sazvar

, Seyed mohammad saeed Alavi

, Hossein Sarpoolaky

Abstract: (9291 Views)

We report a simple and practical approach for the easy production of superhydrophobic coatings based on TiO₂-SiO₂@PDMS. In this study, we used tetraethylorthosilicate (TEOS) and titanium tetraisopropoxide (TTIP) as a precursor for the sol-gel synthesis of SiO₂ and TiO₂, respectively. Afterward, the surface of nanoparticles was modified by 1,1,1,3,3,3-hexamethyldisilazane (HMDS) before being combined with polydimethylsiloxane (PDMS). The hydrophobic property of coatings was evaluated by static contact angle measurements. The phase composition and structural evolution of the coatings were examined by X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR) analysis. It was shown that changing the weight ratio of the solution composition of the coating can affect the hydrophobicity of the surface. The best sample has shown a superhydrophobic property with a 153˚ contact angle which contained (75%TiO₂-25%SiO₂)and PDMS at a weight ratio of 1:1. Moreover, the results showed that the superhydrophobic coating retains its hydrophobic properties up to a temperature of 450 ˚C, and at higher temperatures, it converts to a super hydrophilic with a water contact angle close to 0 ˚. The SiO₂-TiO₂@PDMS coating degrades methylene blue by about 55% and was shown to be capable of photocatalytically decomposing organic pollutants.

Keywords: Superhydrophobic coating, Photocatalytic, Sol-gel, Silica, Titania