Under-oil switchable superhydrophobicity to superhydrophilicity transition on TiO2 nanotube arrays

Hongjun Kang, Yuyan Liu, Hua Lai, Xiaoyan Yu, Zhongjun Cheng, Lei Jiang

Research output: Contribution to journalArticleResearchpeer-review

88 Citations (Scopus)


Recently, smart interfacial materials that can reversibly transit between the superhydrophobicity and superhydrophilicity have aroused much attention. However, all present performances happen in air, and to realize such a smart transition in complex environments, such as oil, is still a challenge. Herein, TiO2 nanotube arrays with switchable transition between the superhydrophobicity and superhydrophilicity in oil are reported. The switching can be observed by alternation of UV irradiation and heating process, and the smart controllability can be ascribed to the cooperative effect between the surface nanostructures and the chemical composition variation. By using the controllable wetting performances, some applications such as under-oil droplet-based microreaction and water-removal from oil were demonstrated on our surface. This paper reports a surface with smart water wettability in oil, which could start some fresh ideas for wetting control on interfacial materials.

Original languageEnglish
Pages (from-to)1074-1082
Number of pages9
JournalACS Nano
Issue number2
Publication statusPublished - 27 Feb 2018
Externally publishedYes


  • superhydrophilicity
  • superhydrophobicity
  • TiO nanotube arrays
  • under-oil
  • wettability switching

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