Fabrication of anti-icing surface with halloysite spherical microcapsule
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Fabrication of anti-icing surface with halloysite spherical microcapsule HongYan Li1,b), Qi Li1, HongLi Liu1,a), Kai Cao1, PengYu Zhang2, Tong Liu2, DongMei Wang2, XiaoLan Liao1, DongQing Wei1 1
School of Materials Science and Engineering, Tianjin Chengjian University, Tianjin 300384, P. R. China Tianjin Building Materials Academy, Tianjin 300381, P. R. China a) Address all correspondence to these authors. e-mail: [email protected] b) e-mail: [email protected] 2
Received: 2 July 2020; accepted: 23 September 2020
The construction of halloysite spherical capsules (halloysite aerogels) was reported for the first time in our previous work. The excellent performance of the microcapsule in functional carrying was also found in our further research. In this work, the anti-icing surface was fabricated by using halloysite nanotubes and halloysite spherical microcapsules. The fabrication of the anti-icing coating was investigated, and the ice nucleation behavior of droplet on the coating surface was studied. The modified halloysite nanotubes (F-HNTs) and the modified halloysite microcapsules (F-HAs) were characterized by Fourier-transform infrared spectroscopy, thermal gravimetric, and pore size distribution. The results show that the introduction of F-HNTs and F-HAs have successfully formed a micro-nano structure on the coating surface with superhydrophobicity performance. The icing temperature of the coating has decreased 2.3 °C compared with bare glass, and the ice adhesion strength has decreased 82%. According to the ice dynamic mechanics, the ice nucleation rate on the coating is significantly reduced, thus the halloysite microcapsule coating has good icephobic performance.
Introduction Anti-ice coating is a simple, low-cost, and efficient way to prevent icing and frosting [1, 2]. The application of anti-ice coating to aircraft, outdoor equipment, artificial satellites, and weapon systems has aroused extensive research interest. At present, the construction mechanism of anti-ice coating can be divided into four categories: (i) superhydrophobic anti-ice coating [3, 4, 5, 6, 7]; (ii) sacrificial anti-ice coating [8]; (iii) oillubricated anti-ice coating (slippery liquid infused porous surface, SLIPS) [9]; and (iv) water-lubricated anti-ice coating [10]. SLIPS is considered as an effective strategy to reduce ice adhesion and increase ice forming time. However, SLIPS has a key limitation: the liquid injected into the pore will eventually fall off under the action of gravity or capillary force, with poor durability and environmental pollution [11, 12, 13]. Superhydrophobic coating is widely reported in the application of self-cleaning [14]. When water drops on the superhydrophobic surface, it will roll off before ice formation, making it has the ability of anti ice. Superhydrophobic surfaces are usually made by self-assembly of nanoparticles or by surface
modification of nanoparticles embedded in polymers, resins, or foams [15, 16]. The agglomeration of nanoparticles can promote the formation of layered
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