Superhydrophobic titania-silica nano complex oxides were synthesized from tetraethylorthosilicate(TEOS) and titanium isopropoxide(TTIP) by an improved sol-gel method followed with high temperature calcination and modification with trimethylchlorosilane(TMCS).The obtained nano complex oxides were characterized by XRD
XPS
BET
SEM and FTIR
and water contact angle.Crystal polymorphism of the nano complex oxides was investigated to explore influence of titania-silica molar ratio as well as calcination temperature on crystal structure.The results showed that rutile crystal structure was achieved at titania-silica molar ratio of 5:1 and calcination temperature of 1100℃.After TCMS surface modification
the superhydrophobic rutile TiO2-SiO2 nano complex oxides exhibited large specific surface area(up to 348 m2·g-1) and excellent hydrophobicity(water contact angle of 154.7°)
which could have a potential application for constructing micro-nano hierarchy-structured top coating of outside wall-decorating materials.