Abstract
A novel method to perform micro mixing without any active devices is proposed. In this novel mixing device, surface tension force from the working fluid is the only energy resource employed passively to transport, merge, mix, and top liquid automatically by the design of channel tructure and surface properties. Fabrication is completed successfully, and the testing result demonstrated effective tension once the liquid is dropped on the entrnce, as well as the mixing between two different liquids without extra actuation.