Enhanced reversible wettability conversion of micro-nano hierarchical TiO2/SiO2 composite films under UV irradiation
Enhanced reversible wettability conversion of micro-nano hierarchical TiO2/SiO2 composite films under UV irradiation
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紫外辐照下微纳分级TiO2/SiO2复合薄膜增强可逆润湿性转化
DOI：
10.1016/j.apsusc.2013.05.085
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发表时间：
2013-10
影响因子：
6.7
通讯作者：
Li Xue-Ru
中科院分区：
文献类型：
--
作者：
Li Wei;Guo Ting;Meng Tao;Huang Yu-Shi;Li Xing;Yan Wei-Li;Wang Shu;Li Xue-Ru
采用一种简便、尺寸可控的方法，在SiO2微球表面沉积纳米TiO 2颗粒，制备了一种新型的TiO 2/SiO2微纳分级复合薄膜。将防水剂（Aquapel PPG Co.，USA）接枝到复合膜上以实现表面疏水性。采用场发射扫描电子显微镜（FE-SEM）、X射线光电子能谱（XPS）和水接触角（WCA）分别对薄膜的形貌、形成过程和润湿性进行了研究。结果表明，这些复合膜可以实现可逆润湿，并在几个周期的紫外线（UV）曝光和黑暗存储是可重复的。由于对这些可调表面的亲水和疏水状态的影响，特定的微纳米结构使得润湿性发生显著变化。我们的研究表明，随着TiO 2/SiO2尺寸比的减小，润湿性转变增加，这导致WCA中的最大润湿对比度为103.8°，这几乎是TiO 2纳米结构薄膜对比度的两倍。提出了一个简单的理论模型来解释尺寸比和WCA之间的相关性，这表明与实验数据吻合得很好。这些发现为设计具有定制和可逆润湿性的智能表面提供了一种新方法。
A new type of micro-nano hierarchical TiO2/SiO2composite film, which is formed by nanoparticles of TiO2deposited on microspheres of SiO2, has been prepared through a convenient and size-controllable method. A water-resistant agent (Aquapel PPG Co., USA) is grafted onto the composite films to achieve surface hydrophobicity. The morphologies, formations, and wettability of the novel films were investigated by field emission scanning electron microscopy (FE-SEM), X-ray photoelectron spectroscopy (XPS) and water contact angle (WCA), respectively. The results indicate that these composite films can achieve reversible wetting and are reproducible over several cycles of ultraviolet (UV) exposure and dark storage. The specific micro-nano structures enabled significant variation in wetting, due to the effect on both the hydrophilic and hydrophobic states of these tunable surfaces. Our study demonstrated that the wettability transition increased with decreased TiO2/SiO2size ratios, which resulted in a maximum wetting contrast in WCA of 103.8°, which is nearly twice the contrast of TiO2nano-structured film. A simple theoretical model was proposed to elucidate the correlation between size ratio and WCA, which indicated good agreement with the experimental data. These findings offer a new method for the design of intelligent surfaces with tailored and reversible wettability.
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影响因子：
1.7
作者：
G. Zhai;L. Ying;E. Kang;K. Neoh
通讯作者：
G. Zhai;L. Ying;E. Kang;K. Neoh
影响因子：
15
作者：
Minko, S;Müller, M;Stamm, M
通讯作者：
Stamm, M
影响因子：
16.6
作者：
Sun, TL;Wang, GJ;Zhu, DB
通讯作者：
Zhu, DB
影响因子：
56.9
作者：
Crevoisier, GB;Fabre, P;Leibler, L
通讯作者：
Leibler, L
影响因子：
3.9
作者：
Motornov, M;Minko, S;Stamm, M
通讯作者：
Stamm, M