期刊
APPLIED PHYSICS LETTERS
卷 116, 期 5, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.5115454
关键词
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资金
- China National Science Fund for Distinguished Young Scholars [51425702]
- National Science Foundation of China [51707016]
- 111 Project of the Ministry of Education, China [B08036]
- Science and Technology Project of SGCC [SGTYHT/14-JS-188]
- Special Funding for China Postdoctoral Science Foundation [2018T110944]
- Key Research and Development Program of Chongqing about Key Technological Innovation in Industries [1026223532180165]
In this Letter, we developed a sprayable superhydrophobic coating with micro-sized disorder indentations to survey the self-ejections of isolated slushes on it during the defrosting process. The microstructures, chemical composition, hydrophobic characteristics, and self-ejection phenomenon of melting slushes on grooved superhydrophobic surfaces are presented. The grooved superhydrophobic surface demonstrates that multiple self-ejections of isolated melting slush off the original locations with no ice bridges or great surface energy release. In addition, the self-ejection of multiple isolated slushes observed generates enough kinetic energy and removes the residual melting slushes in ways of sweeping off. It is also found that the irregular melting slush with a greater deformation energy and surface contact area demonstrates shorter jumping distances compared to that with a spherical shape and low surface contact area. The observed short-distance self-ejection results from the defects of micro-pores on the indentations, leading to great dissipation in vapor pressures and reduced impact from volume fluctuations. Both the volume fluctuation of slush and the evaporation of intermediate liquid generate the pressure gradient in the upward direction and contribute to the self-ejection behavior of isolated melting slush. The results demonstrate the necessity of fabricating grooved superhydrophobic surfaces without micro-pores and conceptual feasibility of employing volume fluctuation of slush for the self-ejection of isolated single melting slush in the case of slushes with no ice bridges, small surface energy, and low inner vapor pressures.
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