Tunable Water Adhesion on Titanium Oxide Surfaces with Different Surface Structures

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• 作者：Junfei Ou ; Weihua Hu ; Changquan Li ; Ying Wang ; Mingshan Xue ; Fajun Wang ; Wen Li
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2012
• 出版时间：November 28, 2012
• 年：2012
• 卷：4
• 期：11
• 页码：5737-5741
• 全文大小：348K
• 年卷期：v.4,no.11(November 28, 2012)
• ISSN：1944-8252

文摘

Tunable water adhesion with high static contact angle (SCA) on titanium oxide surfaces was achieved by a two-step process: first, titanium oxide surfaces with different structures were obtained by immersion the titanium alloy substrates into H₂O鈥揌₂O₂鈥揌F solution at 140 掳C for different time of 30, 60, and 120 min; then, low-surface-energy molecules of 1H, 1H, 2H, 2H-perfluorooctyltrichlorosilane (PFOTS) were deposited thereon. SCA for all so-fabricated samples were higher than 150掳 and sliding angle (SA) for different immersion time of 30 min, 60 min, and 120 min is 180^o, 31卤2^o, and 8卤1^o, respectively. To analyze the correlation between the surface structures and the dynamic wetting behaviors, we adopted, three contact modes (i.e., Wenzel, Cassie impregnating, and Cassie modes). The analyses showed that the surface adhesion was influenced greatly by water/solid interfacial interaction and could be artificially tuned between Wenzel state with high adhesion to Cassie state with low adhesion through the design of appropriate microstructures.

Keywords:

dynamic wetting; sliding angle; contact angle hysteresis; surface structures; titanium oxide; hydrothermal treatment