Investigating the effects of solid surfaces on ice nucleation.
Investigating the effects of solid surfaces on ice nucleation.
复制标题
DOI：
10.1021/la3014915
复制
发表时间：
2012-07
期刊：
影响因子：
--
通讯作者：
Kaiyong Li;Shun Xu;Wenxiong Shi;Min He;Huiling Li;Shuzhou Li;Xin Zhou;Jianjun Wang;
中科院分区：
文献类型：
--
作者：
Kaiyong Li;Shun Xu;Wenxiong Shi;Min He;Huiling Li;Shuzhou Li;Xin Zhou;Jianjun Wang;
了解固体表面在冰成核中所起的作用是设计防冰表面的重要一步。然而，水中不可控的杂质和表面异质性仍然是阐明表面对冰成核影响的巨大挑战。通过在闭孔中设计的蒸发、冷凝和随后冰形成的过程，我们研究了具有完全不同润湿性的平坦固体表面上凝结水微滴集合的冰成核。通过蒸发和冷凝过程在平坦的固体表面上形成的水微滴排除了水中不可控的杂质，并且可以通过研究单独和独立的水微滴集合的冻结来最小化表面异质性的影响。研究发现，亲水表面上的归一化表面冰成核率比疏水表面上的归一化表面冰核率低约1个数量级。这是由于界面水的粘度和表面粗糙度的差异造成的。
Understanding the role played by solid surfaces in ice nucleation is a significant step toward designing anti-icing surfaces. However, the uncontrollable impurities in water and surface heterogeneities remain a great challenge for elucidating the effects of surfaces on ice nucleation. Via a designed process of evaporation, condensation, and subsequent ice formation in a closed cell, we investigate the ice nucleation of ensembles of condensed water microdroplets on flat, solid surfaces with completely different wettabilities. The water microdroplets formed on flat, solid surfaces by an evaporation and condensation process exclude the uncontrollable impurities in water, and the effects of surface heterogeneities can be minimized through studying the freezing of ensembles of separate and independent water microdroplets. It is found that the normalized surface ice nucleation rate on a hydrophilic surface is about 1 order of magnitude lower than that on a hydrophobic surface. This is ascribed to the difference in the viscosity of interfacial water and the surface roughness.