Mechanically durable, super-repellent 3D printed microcell/nanoparticle surfaces
Mechanically durable, super-repellent 3D printed microcell/nanoparticle surfaces
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DOI：
10.1007/s12274-022-4139-3
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发表时间：
2022-03
期刊：
影响因子：
9.9
通讯作者：
Sajad Haghanifar;A. Galante;Mehdi Zarei;Jun Chen;Susheng Tan;Paul W. Leu
中科院分区：
文献类型：
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作者：
Sajad Haghanifar;A. Galante;Mehdi Zarei;Jun Chen;Susheng Tan;Paul W. Leu
三维（3D）打印的凹入微柱已经展示出对于前所未有的各种液体的高静态接触角，但是尚未实现具有低接触角滞后和优异耐磨性的高静态接触角。我们报告了3D打印微单元/纳米颗粒结构的演示，这些结构具有高静态接触角，低接触角滞后和高机械耐久性。微柱和微孔都表现出与水和乙二醇（EG）的高静态接触角，但具有高接触角滞后，这表明玫瑰花瓣润湿。我们的模拟结果表明，微柱是能够实现更高的静态接触角和突破压力，同时与微孔相比。然而，模拟还表明，微柱在其基部具有更高的最大等效应力，使得它们更容易发生机械故障。我们通过创建3D打印的微单元/纳米颗粒阵列来解决接触角滞后和机械耐久性问题，这些微单元/纳米颗粒阵列在1.2 kPa的压力下用Scotch-Brite磨料垫进行100次机械磨损后表现出超排斥性并保持其超排斥性。与微柱相对的互连微单元结构的使用解决了机械耐久性问题。低接触角滞后通过用低表面能纳米颗粒涂覆3D打印结构来实现，这降低了固液接触面积分数。我们的研究结果表明，通过使用与氟化纳米颗粒集成的微单元结构，新的3D打印结构具有机械耐久性和超排斥性。
Three-dimensional (3D) printed re-entrant micropillars have demonstrated high static contact angles for an unprecedented variety of liquids, but have yet to achieve this with low contact angle hysteresis and excellent abrasion resistance. We report on the demonstration of 3D printed microcell/nanoparticle structures that exhibit high static contact angle, low contact angle hysteresis, and high mechanical durability. Micropillars and microcells both exhibit high static contact angles with water and ethylene glycol (EG), but suffer from high contact angle hysteresis, indicative of rose petal wetting. Our modeling results indicate that micropillars are able to achieve higher static contact angle and breakthrough pressure simultaneously compared with microcells. However, simulations also indicate that micropillars have higher maximum equivalent stress at their bases, so that they are more prone to mechanical failure. We address contact angle hysteresis and mechanical durability issues by the creation of 3D printed microcell/nanoparticle arrays that demonstrate super-repellency and retain their super-repellency after 100 cycles of mechanical abrasion with a Scotch-Brite abrasive pad under a pressure of 1.2 kPa. The use of interconnected microcell structures as opposed to micropillars addresses mechanical durability issues. Low contact angle hysteresis is realized by coating 3D printed structures with low surface energy nanoparticles, which lowers the solid—liquid contact area fraction. Our results demonstrate new 3D printed structures with mechanical durability and super-repellency through the use of microcell structures integrated with fluorinated nanoparticles.