Durable, self-cleaning and superhydrophobic bamboo timber surfaces based on TiO2 films combined with fluoroalkylsilane
Durable, self-cleaning and superhydrophobic bamboo timber surfaces based on TiO2 films combined with fluoroalkylsilane
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DOI：
10.1016/j.ceramint.2016.03.047
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发表时间：
2016-06-01
影响因子：
5.2
通讯作者：
Chen, Yuhe
中科院分区：
文献类型：
--
作者：
Li, Jingpeng;Lu, Yun;Chen, Yuhe
包括竹材在内的装饰材料已被提出利用其超疏水和自清洁特性，但对其环境适应性的综合评价仍然不足。本文采用化学溶液沉积和化学改性相结合的方法在竹材基体上制备了一种坚固耐用的超疏水表面。超疏水表面由微纳米级二元结构的TiO 2薄膜和低表面能氟化组分的组装而成，其水接触角为163 +/- 1度，滑动角为3 +/- 1度。在1.2kPa的施加压力下对1500目SiC砂纸机械磨损800 mm后，表面保持超疏水性，表明良好的机械稳定性。此外，超疏水表面对酸性和碱性水溶液（例如，模拟酸雨）。在暴露于大气中超过180天后，所得表面仍保持155 +/-2度的接触角和6 +/-2度的滑动角，显示出良好的长期稳定性。此外，所制备的超疏水表面表现出几乎完全的污垢颗粒与水滴的湿自清洁。该方法为在木质材料上制备大面积、机械强度高、耐腐蚀、自清洁的超疏水表面提供了一条简单有效的途径，具有广阔的应用前景。(C)2016 Elsevier Ltd和Techna Group S.r.l. All rights reserved.
Decorative materials, including bamboo timber, have been proposed to exploit their superhydrophobic and self-cleaning properties, but a comprehensive appraisal of their environmental adaptability is still deficient. In this paper, a robust and durable superhydrophobic surface was formed on bamboo timber substrate through a process combining chemical solution deposition and chemical modification. The superhydrophobic surface resulted from micro-nanoscale binary-structured TiO2 films and the assembly of low-surface-energy fluorinated components, which exhibited a water contact angle of 163 +/- 1 degrees and a sliding angle of 3 +/- 1 degrees. The surface maintained superhydrophobicity after mechanical abrasion against 1500 mesh SiC sandpaper for 800 mm at the applied pressure of 1.2 kPa, indicating good mechanical stability. Moreover, the superhydrophobic surface exhibited good chemical stability against both acidic and basic aqueous solutions (e.g., simulated acid rain). After exposure to atmosphere for more than 180 days, the obtained surface still maintained a contact angle of 155 +/- 2 degrees and a sliding angle of 6 +/- 2 degrees, revealing good long-term stability. In addition, the as-prepared superhydrophobic surface exhibited almost complete wet self-cleaning of dirt particles with water droplets. It is believed that the method presented in this study can provide a straightforward and effective route to fabricate a large-area, mechanically robust, anticorrosive and self-cleaning superhydrophobic surface on woody materials for a great number of potential applications. (C) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved.