Key Laboratory of Green Printing, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
School of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100190, China.
Proc Natl Acad Sci U S A. 2017 Oct 24;114(43):11285-11290. doi: 10.1073/pnas.1712829114. Epub 2017 Oct 9.
No relationship has been established between surface wettability and ice growth patterns, although ice often forms on top of solid surfaces. Here, we report experimental observations obtained using a process specially designed to avoid the influence of nucleation and describe the wettability-dependent ice morphology on solid surfaces under atmospheric conditions and the discovery of two growth modes of ice crystals: along-surface and off-surface growth modes. Using atomistic molecular dynamics simulation analysis, we show that these distinct ice growth phenomena are attributable to the presence (or absence) of bilayer ice on solid surfaces with different wettability; that is, the formation of bilayer ice on hydrophilic surface can dictate the along-surface growth mode due to the structural match between the bilayer hexagonal ice and the basal face of hexagonal ice (ice I), thereby promoting rapid growth of nonbasal faces along the hydrophilic surface. The dramatically different growth patterns of ice on solid surfaces are of crucial relevance to ice repellency surfaces.
尚未确定表面润湿性与冰生长形态之间的关系，尽管冰通常在固体表面形成。在此，我们报告了使用专门设计的过程获得的实验观察结果，该过程旨在避免成核的影响，并描述了在大气条件下固体表面上的润湿性依赖性冰形态以及发现了两种冰晶生长模式：沿面和离面生长模式。通过原子分子动力学模拟分析，我们表明，这些不同的冰生长现象归因于具有不同润湿性的固体表面上存在（或不存在）双层冰；也就是说，亲水表面上双层冰的形成可以由于双层六方冰与六方冰（冰 I）的基面之间的结构匹配来决定沿面生长模式，从而促进非基面沿着亲水表面的快速生长。固体表面上冰的截然不同的生长模式对于冰排斥表面至关重要。
