Abstract
Based on the reflection property of water-superhydrophobic material interface, the underwater wetting behavior of natural lotus leaf and superhydrophobic ZnO arrays was investigated by varying the wetting status with vacuum pumping and pressure-driven with special attention on the influence of the entrapped air in microstructures of their surface. The results show that when air was trapped on the surface, the water-superhydrophobic material interface exhibits different wetting reversibility in the course of compressing and decompressing, which may be affected by the maximum pressure exerted and the morphology of the surface microstructure. The entrapped air in the surface microstructures can delay the intrusion of water and enhance the stability of superhydrophobicity. In certain case, with the decrease of external pressure the expansion of the trapped air can even push out the intruded water and lead to the de-wetting process, therewith benefitial to the stability of superhydrophobic state. Due to the difference in density of trip-phase contact line, the microstructure in nano-scale show better hydrophobic stability rather than that of the microstructures in micro-scale under external pressure.
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