Construction of Superhydrophobic Surfaces by Sol-gel Techniques

In this work, SiO2 sol and 1H, 1H, 2H, 2H-perfluorodecylsilane are mixed in a certain proportion by ultrasonic to obtain modified SiO2 sol and gel. A superhydrophobic coating with a contact angle of 160 degrees and a slide angle of less than 50 was constructed by spin coating on a glass substrate. The sol-gel techniques we used is simple and inexpensive, and the as-constructed superhydrophobic coatings are relatively uniform. In addition, by controlling the number of spin coating, the durability of the coating can be effectively enhanced. It is believed that this technique can hold a great potential in superhydrophobic surface fabrication.