Weng Wei, Tenjimbayashi Mizuki, Naito Masanobu
Research Center for Macromolecules and Biomaterials, National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan.
Research Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan.
iScience. 2024 Sep 28;27(11):111039. doi: 10.1016/j.isci.2024.111039. eCollection 2024 Nov 15.
Largely varied anti-icing performance among superhydrophobic surfaces remains perplexing and challenging. Herein, the issue is elucidated by exploring the roles of surface chemistry and surface topography in anti-icing. Three superhydrophobic surfaces, i.e., gecko-like, petal-like, and lotus-like surfaces, together with smooth hydrophobic and hydrophilic surfaces, are prepared and compared in ice nucleation temperature under both non-condensation and condensation conditions. As a result, in non-condensation condition, water droplet freezing is caused by interfacial heterogeneous nucleation, wherein both surface chemistry and surface topography contribute to deferring freezing, and the former is dominant. In condensation condition, the freezing strongly correlates to condensation frosting. Surface chemistry maintains as a strong deterrent, whereas surface topography has two competing effects on the freezing. The paper deepens the understanding of water freezing on superhydrophobic surfaces, unravels the correlation between superhydrophobicity and anti-icing, and provides design guidelines on application-oriented anti-icing surfaces.
超疏水表面之间存在很大差异的防冰性能仍然令人困惑且具有挑战性。在此，通过探究表面化学和表面形貌在防冰中的作用来阐明这一问题。制备了三种超疏水表面，即类壁虎表面、花瓣状表面和荷叶状表面，以及光滑的疏水和亲水表面，并在非冷凝和冷凝条件下比较了它们的冰核形成温度。结果表明，在非冷凝条件下，水滴冻结是由界面异质成核引起的，其中表面化学和表面形貌都有助于延缓冻结，且前者起主导作用。在冷凝条件下，冻结与冷凝结霜密切相关。表面化学仍然是一种强大的抑制因素，而表面形貌对冻结有两种相互竞争的影响。本文加深了对超疏水表面上水冻结的理解，揭示了超疏水性与防冰之间的相关性，并为面向应用的防冰表面提供了设计指导。
