Irie Hiroshi, Tsuji Ken-Ichi, Hashimoto Kazuhito
Department of Applied Chemistry, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
Phys Chem Chem Phys. 2008 Jun 7;10(21):3072-6. doi: 10.1039/b800179k. Epub 2008 Mar 20.
Polycrystalline anatase TiO(2)-based thin films with surface roughness were fabricated using a sublimation method. Their surfaces showed hydrophobicity with a water contact angle (CA) higher than 130 degrees when stored in the dark. For the films, the hydrophobic conversion behavior and critical CA depended on surface morphologies. The higher hydrophobic conversion rate and higher critical CA were explained by the smaller r in the Wenzel equation and the smaller f (f = 0.56, 0.30) in the Cassie equation, respectively. Moreover, good reversibility between hydrophobicity (CA = 130 degrees ) and high hydrophilicity (CA = 0 degrees ) was observed by alternating between UV light irradiation and dark storage. The combination of chromium oxide with anatase TiO(2) markedly shortens the period of hydrophobic conversion from 12 to 5 days.
采用升华法制备了具有表面粗糙度的多晶锐钛矿TiO₂基薄膜。当在黑暗中储存时，它们的表面表现出疏水性，水接触角（CA）高于130度。对于这些薄膜，疏水转化行为和临界接触角取决于表面形态。较高的疏水转化率和较高的临界接触角分别由Wenzel方程中较小的r和Cassie方程中较小的f（f = 0.56, 0.30）来解释。此外，通过紫外光照射和黑暗储存交替，观察到疏水性（CA = 130度）和高亲水性（CA = 0度）之间具有良好的可逆性。氧化铬与锐钛矿TiO₂的组合显著缩短了疏水转化周期，从12天缩短至5天。
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