Design of Ice-free Nanostructured Surfaces Based on Repulsion of Impacting Water Droplets
Design of Ice-free Nanostructured Surfaces Based on Repulsion of Impacting Water Droplets
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DOI：
10.1021/nn102557p
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发表时间：
2010-12-01
期刊：
影响因子：
17.1
通讯作者：
Aizenberg, Joanna
中科院分区：
文献类型：
--
作者：
Mishchenko, Lidiya;Hatton, Benjamin;Aizenberg, Joanna
控制积冰的材料对飞机效率、高速公路和电力线维护以及建筑施工都很重要。大多数当前的除冰系统包括物理或化学除冰，这是能量和资源密集型的。一个更可取的办法是防止冰的形成，而不是阻止冰的形成。静止水滴在过冷表面上的冻结问题近来引起了人们的极大关注。然而，积冰开始于液滴/基质碰撞，随后是冻结。在这里，我们专注于动态液滴冲击过冷纳米和微结构表面的行为。对温度依赖的液滴/表面相互作用的详细实验分析表明，高度有序的超疏水材料可以被设计成在低至约100 ℃时保持完全无冰。-25至-30摄氏度，因为它们能够在冰成核发生之前排斥冲击水。在低于这些温度下积累的冰可以很容易地除去。通过结合经典的成核理论和传热学、润湿动力学，分析了影响液滴回缩、钉扎和冻结的因素，为合理设计防冰材料奠定了基础。特别是，我们强调的潜力，疏水聚合物涂层轴承给药细胞的表面微观结构，其改善的机械和压力稳定性，易于复制和大规模制造，并有机会更大的调整其材料和化学性质。
Materials that control ice accumulation are important to aircraft efficiency, highway and powerline maintenance, and building construction. Most current deicing systems include either physical or chemical removal of Ice, both energy and resource-intensive. A more desirable approach would be to prevent ice formation rather than to fight its build-up. Much attention has been given recently to freezing of static water droplets resting on supercooled surfaces. Ice accretion, however, begins with the droplet/substrate collision followed by freezing. Here we focus on the behavior of dynamic droplets Impacting supercooled nano- and microstructured surfaces. Detailed experimental analysis of the temperature-dependent droplet/surface interaction shows that highly ordered superhydrophobic materials can be designed to remain entirely ice-free down to ca. -25 to -30 degrees C, due to their ability to repel impacting water before ice nucleation occurs. Ice accumulated below these temperatures can be easily removed. Factors contributing to droplet retraction, pinning and freezing are addressed by combining classical nucleation theory with heat transfer and wetting dynamics, forming the foundation for the development of rationally designed ice-preventive materials. In particular, we emphasize the potential of hydrophobic polymeric coatings bearing dosed-cell surface microstructures for their improved mechanical and pressure stability, amenability to facile replication and large-scale fabrication, and opportunities for greater tuning of their material and chemical properties.