具有高耐腐蚀性和耐久性的超疏水自清洁分层微/纳米复合涂层,ACS Sustainable Chemistry & Engineering

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具有高耐腐蚀性和耐久性的超疏水自清洁分层微/纳米复合涂层
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2021-03-12 , DOI: 10.1021/acssuschemeng.0c09059
Zhipeng Jin ₁ , Hui Mei ₁ , Longkai Pan ₁ , Hongxia Liu ₁ , Laifei Cheng ₁

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由于具有特殊的润湿性能，因此采用了生物启发性的超疏水涂层来保护各种材料。但是，腐蚀性液体的污染或机械损坏会导致许多超疏水表面的憎水性丧失。因此，必须开发化学稳定且耐用的超疏水性涂料。在这项工作中，我们报告了一种简单的方法来制造具有分层微/纳米结构的金属-有机骨架（ZIF-8）/ SiO ₂，其表面疏水性是由聚二甲基硅氧烷（PDMS）改性引起的。值得注意的是，所得ZIF-8 @ SiO _2的表面/ PDMS具有超疏水性，水接触角（CA）为157°。超疏水性材料具有化学稳定性，即使将其暴露于宽范围的pH值（1-14）中24小时，水CA仍保持在150°以上。电化学结果表明，相对于未涂覆的铝基材（E），涂层表现出高的腐蚀电位（E _corr = -0.321 V）和非常低的腐蚀电流密度（i _corr = 1.442×10 ^–11 A·cm ^–2）。_corr = −0.711 V，i _corr = 6.616×10 ^–5 A·cm ^–2），表示由于涂层而产生的高耐腐蚀性。同样，电化学阻抗谱表明，涂层使电荷转移电阻显着增加。这些结果表明具有超疏水性能的ZIF-8 @ SiO ₂ / PDMS涂层具有优异的耐腐蚀性。此外，还证明了各种液滴（例如水，茶，牛奶，咖啡）的超疏水性，这与出色的自清洁性能有关：当液滴滚落时，很容易去除表面污染物。涂层表现出良好的机械性能，在20 kPa的压力下进行100次擦洗后，CA高于150°。这些优异的性能推荐将所得的超疏水涂料用于各种实际应用。

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Superhydrophobic Self-Cleaning Hierarchical Micro-/Nanocomposite Coating with High Corrosion Resistance and Durability

Due to their special wetting properties, bioinspired superhydrophobic coatings are used to protect various materials. However, contamination with corrosive liquids or mechanical damage causes the loss of water repellency of many superhydrophobic surfaces. Therefore, it is imperative to develop chemically stable and durable superhydrophobic coatings. In this work, we report a straightforward method to fabricate a metal–organic framework (ZIF-8)/SiO₂ with hierarchical micro-/nanostructures, whose surface hydrophobicity is induced by polydimethylsiloxane (PDMS) modification. Notably, the surface of the resulting ZIF-8@SiO₂/PDMS displays superhydrophobicity, together with a water contact angle (CA) of 157°. The superhydrophobic material is chemically stable, the water CA remaining above 150° even after exposure to a wide range of pH values (1–14) for 24 h. The electrochemical results showed that the coating exhibits a high corrosion potential (E_corr = −0.321 V) and a very low corrosion current density (i_corr = 1.442 × 10^–11 A·cm^–2) relative to an uncoated aluminum substrate (E_corr = −0.711 V, i_corr = 6.616 × 10^–5 A·cm^–2), indicating a high resistance to corrosion as a result of the coating. Also, electrochemical impedance spectroscopy showed that the charge transfer resistance is significantly increased by the coating. These results indicate that the ZIF-8@SiO₂/PDMS coating with superhydrophobic properties has excellent corrosion resistance. In addition, the superhydrophobicity was proven for various droplets (i.e., water, tea, milk, coffee), an achievement related to the excellent self-cleaning performance: when the droplets roll off, surface contaminants are easily removed. The coating exhibited good mechanical properties, the CA being above 150° after 100 cycles of scrubbing with a pressure of 20 kPa. These excellent properties recommend the obtained superhydrophobic coating for various practical applications.

更新日期：2021-03-22

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