amirreza Sazvar - Master of Materials Engineering, School of Metallurgy and Materials Engineering, Iran University of Science and Technology (IUST), Tehran, Iran
Seyed mohammad saeed Alavi - Bachelor of Materials Engineering, School of Metallurgy and Materials Engineering, Iran University of Science and Technology (IUST), Tehran, Iran. E-mail:
hossein Sarpoolaky - Professor, Faculty Member of Materials and Metallurgy Engineering Department, School of Metallurgy and Materials Engineering, Iran University of Science and Technology (IUST), Narmak, Tehran, Iran.

We report a simple and practical approach for the easy production of superhydrophobic coatings based on TiO۲-SiO۲@PDMS. In this study, we used tetraethylorthosilicate (TEOS) and titanium tetraisopropoxide (TTIP) as a precursor for the sol-gel synthesis of SiO۲ and TiO۲, respectively. Afterward, the surface of nanoparticles was modified by ۱,۱,۱,۳,۳,۳-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 ۱۵۳˚ contact angle which contained (۷۵%TiO۲-۲۵%SiO۲) and PDMS at a weight ratio of ۱:۱. Moreover, the results showed that the superhydrophobic coating retains its hydrophobic properties up to a temperature of ۴۵۰ ˚C, and at higher temperatures, it converts to a super hydrophilic with a water contact angle close to ۰ ˚. The SiO۲-TiO۲@PDMS coating degrades methylene blue by about ۵۵% and was shown to be capable of photocatalytically decomposing organic pollutants.

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