Synthesis of Hydrophobic Silica Coatings on Glass by Sol-Gel and Studying Silver Oxide Effect on the Wettability

Wetting behavior of solid surfaces is a key Factor in our daily life as well as in engineering and science. In addition، Control on the wettability of solid state materials is important in surface engineering. Hydrophobic surfaces with water contact angle higher than 90◦ generated a lot of interest both in academia and in industry because of the self-cleaning properties. In present study، TEOS based hydrophobic، self-cleaning silica coatings on a glass substrate by sol–gel process was prepared. The coating sol was prepared by simple dip coating method. The coating alcosol was prepared by keeping the molar ratio of tetraethoxysilane (TEOS)، Phenyltriethoxysilan (PTES)، ethanol and ammonium hydroxide (NH4OH) constant. The effect of materials such as، silver oxide on hydrophobicity was studied. The films were characterized by scanning electron microscopy (SEM)، X-ray powder diffractometry (XRD)، Fourier transform infrared spectroscopy (FTIR)، water contact angle (CA) and Atomic force Microscopy)AFM(measurements. The results showed that good hydrophobicity is obtained with PTES/TEOS=1 without silver oxide Relative to the sample with silver oxide and the contact angle was 124˚.