Three-level cobblestone-like TiO 2 micro/nanocones for dual-responsive water/oil reversible wetting without fluorination

Chen Zhou, Guoqiang Li, Chuanzong Li, Zhen Zhang, Yachao Zhang, Sizhu Wu, Yanlei Hu, Wulin Zhu, Jiawen Li, Jiaru Chu, Zhijia Hu, Dong Wu, Liandong Yu

Research output: Contribution to journalArticle

Abstract

In this work, a kind of three-level cobblestone-like anatase TiO 2 microcone array was fabricated on titanium sheets by femtosecond laser-induced self-assembly. This three level structure consisted of cobblestone-like features (15-25 μm in height and 20-35 μm in diameter), ∼460 nm ripple-like features, and smaller particles (10-500 nm). The formation of microcone arrays can be ascribed to the interaction of alternant laser beam ablation. TiO 2 surfaces display dual-responsive water/oil reversible wetting via heat treatment and selective UV irradiation without fluorination. It is indicated that three-level scale surface roughness can amplify the wetting character of the Ti surface, and the mechanism for reversible switching between extreme wettabilities is caused by the conversion between Ti-OH and Ti-O. Moreover, the double-faced superhydrophobic and double-faced superhydrophilic Ti samples were constructed, which exhibited stable superhydrophobicity and underwater superoleophobicity in water-oil solution, respectively, even when strongly shaken. Finally, we present the hybrid-patterned TiO 2 surface and realized reversible switching pattern wettability.

Original languageEnglish
Article number141607
JournalApplied Physics Letters
Volume111
Issue number14
DOIs
Publication statusPublished - 2 Oct 2017

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