These phenomena are known as superfluidity, superlubricity, superhydrophobicity, and supersolidity (4S) , which share the common mechanism of being more elastic, repulsive, and frictionless while in relative motion. According to Wenzel-Cassie-Baxter law, a hydrophilic surface becomes even more hydrophilic and a hydrophobic one more hydrophobic when it is nanoscaled roughened . The 4S phenomena of water droplets are crucial to many fields, such as transporting through hydrophobic channels for cell culturing and separating.