Active deicing of technical surfaces, such as for wind turbines and heat exchangers, currently requires the usage of heat or chemicals. Passive coating strategies that postpone the freezing of covering water would be beneficial in order to save costs and energy. One hypothesis is that pyroelectric active materials can achieve this because of the surface charges generated on these materials when they are subject to a temperature change. High‐quality poly(vinylidene fluoride‐co‐trifluoroethylene) (P(VDF‐TrFE)) thin films with a high crystallinity, prefererd edge‐on orientation, low surface roughness, and comprised of the β‐analogous ferroelectric phase were deposited by spin‐coating. Freezing experiments with a cooling rate of 1 K min⁻¹ were made on P(VDF‐TrFE) coatings in order to separate the effect of different parameters such as the poling direction, film thickness, used solvent, deposition process, underlying substrate, and annealing temperature on the achievable supercooling. The topography and the underlying substrate significantly changed the distribution of freezing temperatures of water droplets in contact with these thin films. In contrast, no significant effect of the thickness, morphology, or pyroelectric effect of the as‐prepared domain‐state on the freezing temperatures was found.

中文翻译：

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热电聚偏二氟乙烯-三氟乙烯共聚物薄膜的非均质冻结

诸如风力涡轮机和热交换器之类的技术表面的主动除冰目前需要使用热量或化学物质。为了节省成本和能源，推迟冻结覆盖水的被动涂覆策略将是有益的。一种假设是热电活性材料可以实现这一目标，因为当这些材料经受温度变化时，它们会产生表面电荷。旋转沉积高品质的聚（偏二氟乙烯-三氟乙烯）（P（VDF-TrFE））薄膜，该薄膜具有高结晶度，偏向的定向取向，较低的表面粗糙度以及由β相似的铁电相组成-涂层。冷却速度为1 K min ^-1的冷冻实验我们在P（VDF-TrFE）涂层上进行了涂层处理，以分离不同参数的影响，例如极化方向，薄膜厚度，使用的溶剂，沉积工艺，底层基材和退火温度，以实现可实现的过冷。形貌和下面的基底显着改变了与这些薄膜接触的水滴的冻结温度分布。相反，未发现所准备的畴态的厚度，形态或热电效应对冷冻温度有显着影响。