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“Background Interfacial interaction between liquid and solid is of great importance for materials in SB-715992 in vitro various applications, such as absorption, adhesion, lubrication, and transference. Due
to easy deformation of liquid, large droplets slide on a solid surface easier than the small ones. The mobility of droplets depends not only on the properties and size of liquid but also on the surface state of solid [1]. Superhydrophobic surfaces which have a static contact angle (CA) larger than 150° [2] are desired in collecting and delivering tiny water droplets in some cases [3, 4]. Various approaches have been established to construct superhydrophobic surfaces, such as coating with hydrophobic materials [5–7], increasing roughness [8, 9], and fabricating hierarchical micro/nanoarchitectures [10–12]. Interfacial interaction hinders the motion of stationary water droplets on a solid surface, resulting in CA hysteresis.