Preparation of hydrophobic SiO2 film with high transmittance by sol mixing method

In order to obtain the SiO 2 film with concave-convex structures by sol-gel and dip-coating, the sol mixing method was used. The effects of the sol mixing ratio on the microstructure, contact angle and transmittance of films were studied. The results show that the sol mixing significantly improved the roughness, contact angle and transmittance of SiO 2 films. As the ratio of the large-sized nano-SiO 2 particles increased, the contact angle and the transmittance of the film first increased and then decreased. Finally, the hydrophobic SiO 2 film with the contact angle of 141.38° and the transmittance of 97.55% within 380–1100 nm was prepared.