Fundamental study of energy for jumping motion of a water strider off water

소금쟁이의 수면 위 도약을 위한 에너지에 관한 기본 연구

In the previous research, it has been found that water strider's legs are strongly water repellent due to hierarchical structure of hydrophobic setae on the legs. Here we propose an answer why they should be so hydrophobic by showing that the work required to remove a floating hydrophobic cylinder from an interface depends very sensitively on the contact angle of the cylinder: superhydrophobic cylinders require relatively little work to remove them from an interface. Also we experimentally study the work required to lift a leg out of water with different contact angles and compare our experimental results with a theoretical prediction.