Liquid metal droplet can be used as contact and moving part in a microswitch system for such application areas as space electronics. In order to build clear knowledge about the behavior of liquid metal droplet under electrostatic actuation, the contact properties of the droplet on structured surface are investigated in this paper. Forces needed to slide or detach a liquid metal droplet on microstructured surface are theoretically analyzed. Micropositionor and a high-resolution goniometer are used to build up testing setup to experimentally evaluate sliding and detaching of the liquid metal droplet. Experimental results show that the physical modification (i.e., microstracturing) of surface can greatly reduce the adhesion between liquid metal droplet and solid surface and ease its actuation.

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