TiO2纳米薄膜油下超疏水/超亲水性的可逆调控

doi:10.7503/cjcu20180493

高等学校化学学报 ›› 2018, Vol. 39 ›› Issue (12): 2621.doi: 10.7503/cjcu20180493

TiO₂纳米薄膜油下超疏水/超亲水性的可逆调控

康红军¹, 于晓妍¹, 来华¹, 成中军²(), 刘宇艳¹()

1.哈尔滨工业大学化工与化学学院, 新能源转换与储存关键材料技术工业和信息化部重点实验室
2. 基础与交叉科学研究院, 哈尔滨 150001

收稿日期:2018-07-11 出版日期:2018-12-03 发布日期:2018-10-22
作者简介:
联系人简介: 刘宇艳, 女, 博士, 教授, 主要从事形状记忆材料研究. E-mail: liuyy@hit.edu.cn;成中军, 男, 博士, 副研究员, 主要从事材料表面浸润性研究. E-mail: chengzhongjun@iccas.ac.cn
基金资助:
国家自然科学基金(批准号: 21304025, 51573035)资助.

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

KANG Hongjun¹, YU Xiaoyan¹, LAI Hua¹, CHENG Zhongjun^2,^*(), LIU Yuyan^1,^*()

1. Ministry of Industry and Information Technology Key Laboratory of Critical Materials Technology for New Energy Conversion and Storge, School of Chemistry and Chemical Engineering
2. Academy of Fundamental and Interdisciplinary Sciences, Harbin Institute of Technology, Harbin 150001, China

Received:2018-07-11 Online:2018-12-03 Published:2018-10-22
Contact: CHENG Zhongjun,LIU Yuyan E-mail:chengzhongjun@iccas.ac.cn;liuyy@hit.edu.cn
Supported by:
† Supported by the National Natural Science Foundation of China(Nos.21674030, 51573035).

摘要/Abstract

摘要：

采用简单的提拉镀膜法制备了一种TiO₂纳米薄膜, 在油相介质中, 水滴在其表面的接触角约为160°, 呈现出油下超疏水状态. 当在湿度为20%的空气环境下对TiO₂纳米薄膜进行紫外光照射(60 min)后, 该薄膜由油下超疏水状态转变为油下超亲水状态. 对紫外光照射后的TiO₂纳米薄膜在100 ℃下热处理70 min后, 该薄膜又恢复到了初始的油下超疏水状态. 因此, 通过紫外光照射和热处理可实现TiO₂纳米薄膜油下超疏水性与油下超亲水性的可逆调控. TiO₂纳米薄膜油下水超浸润性可逆调控主要归因于薄膜表面的微纳米结构和化学组成变化的协同作用.

关键词: TiO₂纳米薄膜, 油下超疏水, 油下超亲水, 可逆调控

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:

康红军, 于晓妍, 来华, 成中军, 刘宇艳. TiO₂纳米薄膜油下超疏水/超亲水性的可逆调控. 高等学校化学学报, 2018, 39(12): 2621.

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

图/表 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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TiO₂纳米薄膜油下超疏水/超亲水性的可逆调控

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

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