Despite the opportunity to manipulate the water freezing via superhydrophobic materials, their commercial use for passive icing protection is still questioned, since the combined effect of surface morphology, air cushion arrangement, roughness, chemistry and film thickness on the icephobic properties of a given non-wettable solid remains unexplored. This article addresses the existing research gaps by studying the ice nucleation dynamics at the contact line of various superhydrophobic soot-based surfaces, potentially applicable in cryobiology for enhancing the existing cryopreservation technologies. We examine the freezing time and freezing temperature of water droplets settled on three groups of soot coatings with divergent morphochemical features, adjusted by modifying the samples with alcohol, fluorocarbon and/or silver hydrogen fluoride. Our results demonstrate the appearance of a new “contour” freezing mode, where the droplet shell crystallizes simultaneously with the contact interface, whilst the soot's chemical bonds along with some of its physical characteristics govern the ice formation.

尽管有机会通过超疏水材料控制水冻结，但它们在被动结冰保护方面的商业用途仍然受到质疑，因为表面形态、气垫布置、粗糙度、化学和膜厚度对给定非疏水材料的憎冰性能的综合影响。可湿性固体仍未探索。本文通过研究各种超疏水烟灰表面接触线处的冰成核动力学来解决现有的研究空白，可能适用于低温生物学以增强现有的低温保存技术。我们检查了落在三组具有不同形态化学特征的烟灰涂层上的水滴的冻结时间和冻结温度，通过用酒精、碳氟化合物和/或氟化氢银对样品进行调整来进行调整。