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低冰粘附強度表面設計與制備研究進展

Research progress on the design principle and preparation of low ice adhesion surface

  • 摘要: 表面結冰給通訊、電力等工業領域帶來巨大損失,電加熱和噴灑乙二醇等主動除冰方法雖然在一定程度上可以解決上述問題,但在能源、人力、環境方面需付出較高代價。為解決這一問題,低成本、低能耗的被動式防/除冰表面被寄予厚望。防/除冰表面主要分為延長結冰時間的防冰表面和低冰粘附強度的除冰表面。由于實際工況的復雜性,除冰表面比防冰表面更具有可實現性。除冰表面主要與低表面能、界面滑動和裂紋產生相關,低冰粘附強度表面按實現機理可分為化學改性低表面能表面、潤滑表面、界面滑動表面和裂紋源表面。本文對不同類型低冰粘附表面的低冰粘附強度產生的原因和表面的制備方法進行總結。同時,對冰粘附強度的測量標準進行了說明和討論,以解釋不同的測試方法對防/除冰性能測試結果造成的差異。

     

    Abstract: Ice accretion on a bare surface causes a serious problem in industries and daily life such as communication, electricity, and transportation. At present, the main de-icing method is active de-icing, which includes mechanical de-icing or electric-thermal de-icing and spraying glycol anti-icing agents. These methods have a high cost of manpower, energy, and environment. In addition, active de-icing is not applicable in many scenarios. To solve this problem, icephobic surfaces are expected to be widely used. Icephobic surfaces can be divided into surfaces that prolong the freezing time and surfaces with low ice adhesion. Anti-icing surfaces, represented by superhydrophobic surfaces, can inhibit a stable formation of ice nucleation from delaying ice formation, which enables the supercooled droplets to rebound from the surface to prevent ice formation. However, under high humidity and high atmospheric pressure, the superhydrophobic surface may lose efficiency due to frosting and other reasons. Compared with anti-icing surfaces, de-icing surfaces are more achievable. Thus, this article mainly explores surfaces with low ice adhesion. Passive de-icing mainly refers to the construction of the ice sparing surface on a bare substrate to reduce the adhesion strength of icing. Compared with active de-icing methods, the passive method has advantages of low energy consumption, low cost, and environmental friendliness. The realization of low ice adhesion is mainly related to low surface energy, interface slippage, and crack initiation. According to the realization mechanism, low ice adhesion surfaces can be divided into low surface energy surfaces, lubricated surfaces, interfacial slippage and low shear modulus surfaces, and crack initiators surfaces. The design principles and mechanism of the de-icing surface are explored and summarized in this article. In addition, to eliminate the doubts about the large variations in the reported ice adhesion strength caused by different measurement methods, the measurement standards of ice adhesion are also analyzed and discussed.

     

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