关键词: 超疏水表面, 微纳结构, 液滴, 合并, 弹跳

Abstract: Superhydrophobic surface was prepared by self-assembled monolayers coatings of n-octadecyl mercaptan on the nanostructured copper substrate.Characteristics of movement dynamics feathers induced by droplet coalescence were investigated by high speed camera and microsurgical technique on horizontal superhydrophobic surface.Experimental results indicate that droplet jumping phenomenon induced by the energy difference between surface energy released by droplet coalescence and surface adhesion effect can be obtained.The smaller the initial droplet is，the higher the coalescent droplet jumps.Theoretical analysis is presented based on the energy conservation.Surface adhesion energy and viscous dissipation caused by droplet movement are also considered.Theoretical results show that droplet jumping phenomenon induced by droplet coalescence can occur when droplet radius is larger than the minimum droplet radius.The minimum droplet radius is approximate 39.9 μm.Droplet jumping height increases with an increase of droplet radius.However，droplet jumping height will decrease with an increase of droplet radius when droplet radius is larger than the critical value.The maximum jumping height can be obtained when droplet radius equals to 83.7 μm.Droplet jumping phenomenon will disappear when droplet radius is larger than 3.9 mm.However，droplet pulsation phenomenon on droplet coalescence position can be found in the meanwhile.