Photothermal superhydrophobic anti-icing interface design with multi-functional protection

摘要

The disaster of low temperature rain, snow and ice will cause great harm to rail transit, power transmission network, aerospace, ships and so on[1 -3]. Superhydrophobic materials can increase the nucleation barrier of ice crystals to prevent surface wetting and become a new anti -icing material[4-6]. However, in the periodic anti -icing process, the micro -structure damage caused by uncontrollable external forces and low surface energy dissipation make the Cassie -Baxter state change to the Wenzel state, making the single superhydrophob ic surface anti -icing function fail[7, 8]. Therefore, improving the mechanical and chemical stability of the superhydrophobic surface is the key to enhance the service life of the superhydrophobic coating. Hence, we put forward the photothermal superhydrophobic active and passive anti-icing technology. Through the interaction of solar photons with the coating surface, heat is generated to melt ice and deliquid, and the purpose of permanent anti-icing is achieved. Specific research is as follows: 1. The phot othermal superhydrophobic coating of Graphene@SiO 2 hybrid was prepared. The mechanical stability of the coating was improved by the "pinning effect" on the surface of AZ31 treated with micro -arc oxidation (MAO). The coating contact angle is 162.2°. The excellent photothermal effect of multilayer graphene results in an average coating temperature of 49.56 °C (200 mW/cm2). At the same time, the coating surface has "air valley", the barrier effect is enhanced, acid resistance, corrosion resistance. 2. Using plasma electrolytic oxidation (PEO) technology, porous black ceramics with narrow band gap semiconductor properties were formed in situ on the surface of AZ31 magnesium alloy. At the same time, polydimethylsiloxane micro -nano particles were loaded. The results show that the composite coating has a band gap of 3.62 eV, the photothermal temperature of 69.4 °C (200 mW/cm2), the contact angle of 156 °, and excellent anti-icing performance and long-term stability.