Reversibly photo-switchable wettability of stearic acid monolayer modified bismuth-based micro-/nanomaterials,Physical Chemistry Chemical Physics

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Reversibly photo-switchable wettability of stearic acid monolayer modified bismuth-based micro-/nanomaterials
Physical Chemistry Chemical Physics ( IF 2.9 ) Pub Date : 2017-11-06 00:00:00 , DOI: 10.1039/c7cp05848a
Hao Yang _{1,

2,

3,

4} , Xiaojing Hu _{1,

2,

3,

4} , Chunping Su _{1,

2,

3,

4} , Yunling Liu _{4,

5,

6,

7} , Rong Chen _{1,

2,

3,

4}

Affiliation

In this work, we demonstrated a general approach to realize superhydrophobic–superhydrophilic reversible transition over hydrophilic bismuth-related micro-/nanomaterials. Different superhydrophobic bismuth-based micro-/nanomaterials, including BiOCOOH, Bi₂O₃, (BiO)₂CO₃ and BiOCl, were obtained by modification with stearic acid, regardless of their morphologies. The reversible wettability of the bismuth-related materials upon alternative UV-vis irradiation and dark storage were investigated via cyclic experiments. The results indicated that the reversible wetting behavior was highly related with the photocatalytic activities of the bismuth-based materials. High photocatalytic activity resulted in less reversible cycles between superhydrophobicity and superhydrophilicity due to the photodegradation of stearic acid. Moreover, with the increase of cycle number, the required minimal time for photo-induced superhydrophilicity decreased and the minimal time for the recovery of superhydrophobicity under dark storage increased. Based on peak deconvolution analysis of XPS and FTIR spectra, a comprehensive understanding of reversible wettability of the bismuth-related micro-/nanomaterials was proposed. This work provides a new strategy to fabricate superhydrophobic–superhydrophilic switchable surfaces for most hydrophilic inorganic materials with different morphologies and photocatalytic activities.

中文翻译：

硬脂酸单层改性铋基微/纳米材料的可逆光开关润湿性

在这项工作中，我们展示了一种在亲水铋相关的微/纳米材料上实现超疏水-超亲水可逆转变的通用方法。通过硬脂酸改性获得了不同的超疏水铋基微/纳米材料，包括BiOCOOH，Bi ₂ O ₃，（BiO）₂ CO ₃和BiOCl，无论它们的形态如何。在替代性的UV-vis照射和暗存储铋有关的材料的润湿性可逆进行了调查通过循环实验。结果表明，可逆润湿行为与铋基材料的光催化活性高度相关。高的光催化活性由于硬脂酸的光降解而导致在超疏水性和超亲水性之间较少的可逆循环。此外，随着循环次数的增加，减少了光诱导的超亲水性所需的最短时间，并且增加了黑暗储存条件下恢复超疏水性所需的最短时间。基于XPS和FTIR光谱的峰去卷积分析，提出了与铋有关的微/纳米材料可逆润湿性的全面理解。

更新日期：2017-11-22

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