Wetting Studies of Hydrophilic−Hydrophobic TiO2@SiO2 Nanopatterns Prepared by Photocatalytic Decomposition

摘要: TiO2@SiO2 nanopatterns were prepared with the evaporation-induced self-assembly (EISA) technique. The material consists of an ultrathin (∼2 nm) layer titania hexagonally ordered craters roughly 30 nm in diameter, on a silica substrate. open pore structure and high homogeneity pattern makes these materials ideal for detailed wetting studies. functionalized fluoroalkylsilane (FAS), which attached both silica, resulting hydrophobic surface. By irradiating composite UV light different lengths time, hydrophilic/hydrophobic contrast nanopattern could be tuned. This is result very photocatalytic properties silica. area fraction covered FAS, fFAS, as function irradiation time was calculated from water contact angle measurements film corresponding reference samples, by using existing models heterogeneous surfaces. results ...