Fabrication and evaluation of omniphobic transparent glass with self-cleaning and anti-fogging capability

Abstract

It is well known that superhydrophobic surfaces, having an apparent contact angle of water higher than 150° and low contact angle hysteresis, show a self-cleaning property, i.e. lotus effect. However these surfaces are vulnerable to oil contamination and in contaminated by oil. their self-cleaning property deteriorate. Therefore, it is vital for the surfaces to be omniphobic, Here we fabricate, optimize, and test omniphobic transparent glass prepared by non-lithographic, anisotropic etching. In order to make surface roughness and lower surface energy, a glow discharge of CF4 gas and 1H,1H,2H,2H-perfluorooctyl trichlorosilane (PFOTS) were used, respectively. We investigate the effect of temperature, CF4 plasma duration, and PFOTS vapor deposition time on the contact angles of water, ethylene glycol, and hexadecane. The results of measurements of the contact angle were also compared with theory of Cassie and Baxter. Finally, optical transmission for several glass was measured to quantify self-cleaning and anti-fogging.