Reversible Control of Under-oil Superhydrophobicity to Superhydrophilicity on TiO2 Nanostructured Thin Film†

doi:10.7503/cjcu20180493

Abstract

Abstract:

A TiO₂ nanostructured thin film was prepared by a simple pull-out coating method. The as-prepared TiO₂ nanostructured thin film shows under-oil superhydrophobicity with water contact angle(WCA) of 160°. Upon UV irradiation for 60 min with humidity of 20% in air, TiO₂ nanostructured thin film can switch from under-oil superhydrophobicity to superhydrophilicity. When the UV-irradiated TiO₂ nanostructured thin film was heated at 100 ℃ for 70 min, the thin film can restore initial under-oil superhydrophobic state. The results indicate the reversible control of under-oil superhydrophobicity to superhydrophilicity on TiO₂ nanostructured thin film can be realized by alternation of UV irradiation and heating process. The reversible control of under-oil water super-wetting on TiO₂ nanostructured thin film can be ascribed to the cooperative effect between the surface nanostructure and the chemical composition variation.

Key words: TiO₂ nanostructured thin film, Under-oil superhydrophobicity, Under-oil superhydrophilicity, Reversible control

TrendMD:

KANG Hongjun,YU Xiaoyan,LAI Hua,CHENG Zhongjun,LIU Yuyan. Reversible Control of Under-oil Superhydrophobicity to Superhydrophilicity on TiO₂ Nanostructured Thin Film^†[J]. Chem. J. Chinese Universities, 2018, 39(12): 2621.

Figures/Tables 5

Fig.1 SEM images(A—C) and XRD pattern(D) of TiO2 nanostructured thin film(A) With low magnification; (B) with high magnification, the inset is the magnified image of nanoparticles; (C) cross-sectional view.

Fig.2 Reversible control wettability of the as-prepared TiO2 nanostructured thin film(A, B) Shapes of a water droplet(4 μL) on the as-prepared TiO2 nanostructured thin film before(A) and after(B) UV irradiation in air. (C, D) Shapes of an oil droplet(4 μL, 1, 2-dichloroethane) on the as-prepared TiO2 nanostructured thin film before(C) and after(D) UV irradiation in air. (E, F) Shapes of a water droplet(4 μL) on the as-prepared TiO2 nanostructured thin film before(E) and after(F) UV irradiation in oil.

Fig.3 Dependence of under-oil water contact angel on UV irradiation(A) and heating time(B) on TiO2 nanostructured thin film, the cycles of the reversible wettability control on TiO2 nanostructured thin film(C) and reversible wettability control of TiO2 nanostructured thin film under various oils(D)(D) a. Gasoline; b. benzene; c. cyclohexane; d. petroleum ether.

Fig.4 XPS spectra of TiO2 nanostructured film in C1s(A—C) and O1s(D—F) regions(A), (D) Before UV irradiation; (B), (E) after UV irradiation; (C), (F) after heating.

Fig.5 Schematic illustration of under-oil reversible wettability control on the as-prepared film(A) Under-oil superhydrophobic state; (B) under-oil superhydrophilic state.

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Reversible Control of Under-oil Superhydrophobicity to Superhydrophilicity on TiO₂ Nanostructured Thin Film^†

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