【摘要】 水下超疏水现象在金属防腐蚀保护、减阻和防止水下污垢等方面具有重要的应用价值.水下超疏水状态的寿命是制约超疏水材料在水下应用的重要因素.本文通过连续记录超疏水界面处反射光光强变化测试了荷叶在不同水深下的超疏水状态的寿命.荷叶在水下的润湿状态随时间变化可分为3个阶段:非润湿阶段、部分润湿阶段、完全润湿阶段.非润湿阶段持续的时间即是水下超疏水状态的寿命,随水深的升高呈指数下降,在水深高于毛细力所能抵抗的极限深度时寿命又进一步缩短.气液界面的稳定依靠毛细力产生的悬挂力和空气内部压力共同维持.提高毛细力所能抵抗的极限水深可以使超疏水材料在更深的水域下得到应用.更多还原

【Abstract】 Underwater superhydrophobic phenomenon has important applications in metal corrosion protection, drag reduction and prevention of underwater dirt and so on. The lifetime of underwater superhydrophobicity is the important factor that restricts the application of superhydrophobic materials under water. And in this paper it is tested through the continuous recording reflected light intensity variation of superhydrophobic interface when lotus leaves are in different water depths. The change progress of underwater wetting state with time can be divided into three stages: Non-wetting stage, partial wetting stage and total wetting stage. The duration of non-wetting stage is the lifetime of underwater superhydrophobicity. And it decreases exponentially with the water depth increased. When the water depth is higher than the ultimate depth that the capillary force can resist, the lifetime is further shortened. The vapor-liquid interface stability relys on suspension force produced by the capillary force and the air pressure. Superhydrophobic materials can be applied in deeper waters by improving the ultimate depth that the capillary force can resist.更多还原