title: "Dual-parallel-channel" shape-gradient surfaces: toward oriented and reversible movement of water droplets.
abstract: In this paper, we prepared "dual-parallel-channel" shape-gradient surfaces, on which water droplets can reversibly and orientedly move between two adjacent pools under the guidance of an external voltage. Furthermore, it is found that the motion speed is governed by several parameters, including bath condition, gradient angle, and the working voltage. In this self-transportation process of water droplets, the external voltage works like a traffic light, which can give "moving", "stopping", "turning" and "straight-going" signals to the water droplets.
authors.affiliation: State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Graduate University of the Chinese Academy of Sciences, Changchun 130022, PR China.
authors.forename: Jilin
authors.initials: J
authors.lastname: Zhang
authors.forename: Yanchun
authors.initials: Y
authors.lastname: Han