Turning Hierarchically Micro-/Nanostructured Polypropylene Surfaces Robustly Superhydrophobic via Tailoring Contact Line Density of Mushroom-Shaped Nanostructure
Turning Hierarchically Micro-/Nanostructured Polypropylene Surfaces Robustly Superhydrophobic via Tailoring Contact Line Density of Mushroom-Shaped Nanostructure
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DOI：
10.1016/j.ces.2022.118027
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发表时间：
2022-08
影响因子：
4.7
通讯作者：
Yanmei Zhang;Qingsong Xing;Anfu Chen;Mingke Li;Guofeng Qin;Jingjing Zhang;C. Lei
中科院分区：
文献类型：
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作者：
Yanmei Zhang;Qingsong Xing;Anfu Chen;Mingke Li;Guofeng Qin;Jingjing Zhang;C. Lei
Cassie-Baxter方程并不总是适用于所有非均匀表面来解释超疏水现象。采用两步阳极氧化法结合微结构（MS）压印工艺制备了蘑菇状纳米结构（NS）和微/纳米结构（MNS）的阳极氧化铝（AAO）模板。单层结构的聚丙烯表面（即，NS或MS）和分层结构（即，MNS）通过压缩模制使用AAO模板复制。提高单层结构疏水性的关键是提高接触线密度（ρcl）。数据拟合表明，ρ cl与接触角（CA）呈指数关系。通过调整NS的直径和阵列密度，优化后的NS副本的CA为163.7°，滚降角为0.9°。此外，优化后的MNS复型具有0.2°的低CA滞后和4 μN的表面粘附力，与NS复型相比，能量损失相对降低了7%。
The Cassie–Baxter equation is not always applied to all heterogeneous surfaces for explaining superhydrophobic phenomena. A two-step anodization method combining with a microstructure (MS) imprinting process is used to prepare anodized aluminum oxide (AAO) templates with mushroom-shaped nanostructure (NS) and micro-/nanostructure (MNS). Polypropylene surfaces with single-tier architecture (i.e., NS or MS) and hierarchical structure (i.e., MNS) are replicated using AAO templates by compression molding. The key to improving hydrophobicity of single-tier architecture is increasing contact line density (ρcl). Data fitting shows that the relationship betweenρcland contact angle (CA) is a sophisticatedly exponential curve. By tuning the diameter and array density of NS, the optimized NS replica achieves a CA of 163.7° and roll-off angle of 0.9°. Further, the optimized MNS replica possessing low CA hysteresis of 0.2° and surface adhesion force of 4 μN achieves a relative reduction of energy loss by 7% compared with NS replica.