表面纳米结构对过冷水形核的影响

The Effects of Surface Nanostructures on the Nucleation of Supercooled Water

采用分子动力学方法研究了电场作用下金属铝表面的不同纳米结构对过冷水形核的影响。在具有不同尺度表面结构的系统中,过冷水形核后均倾向于形成多晶结构。形核的过程不仅有六环结构的逐层生长同时也包含了冰相水分子间的聚并。此外,形核比较容易发生在亚表面层,光滑壁面附近的晶核比带结构表面附近的晶核具有更快的生长速度。

The nucleation of supercooled water under electric field on aluminum surface with different nanostructures was investigated by using the molecular dynamics simulation method. Polycrystalline structures were observed in all systems. The nucleation process contains not only the growth of six-ring structures but also the coalescence of ice-like water molecules. In addition, the nucleation process starts dominantly from the sub-surface. Crystal nuclei near the smooth surface grow faster than those near the structured surfaces.