Wetting of soap bubbles on hydrophilic, hydrophobic and superhydrophobic surfaces

摘要

Wetting of sessile bubbles on solid and liquid surfaces has been studied. Amodel is presented for the contact angle of a sessile bubble based on amodified Young equation - the experimental results agree with the model. Ahydrophilic surface results in a bubble contact angle of 90 deg whereas on asuperhydrophobic surface one observes 134 deg. For hydrophilic surfaces, thebubble angle diminishes with bubble radius - whereas on a superhydrophobicsurface, the bubble angle increases. The size of the Plateau borders governsthe bubble contact angle - depending on the wetting of the surface.