A 3D liquid self-shaping strategy is reported for rapidly patterning materials over a series of compositions and accurately achieving micro- and nanoscale structures. The predesigned template selectively pins the droplet, and the surface energy minimization drives the self-shaping processing. The as-prepared 3D circuits assembled by silver nanoparticles carry a current of 208–448 μA at 0.01 V impressed voltage, while the 3D architectures achieved by two different quantum dots show noninterfering optical properties with feature resolution below 3 μm. This strategy can facilely fabricate micro-nanogeometric patterns without a modeling program, which will be of great significance for the development of 3D functional devices.
By introducing anisotropic micropatterns on a superhydrophobic surface, we demonstrate that water microdroplets can coalesce and leap over the surface spontaneously along a prescribed direction. This controlled behavior is attributed to anisotropic liquid–solid adhesion. An analysis relating the preferential leaping probability to the geometrical parameters of the system is presented with consistent experimental results. Surfaces with this rare quality demonstrate many unique characteristics, such as self-powered, and relatively long-distance transport of microdroplets by “relay” coalescence-induced leaping.
(Paper: Jie Liu, Haoyuan Guo, Bo Zhang, Shasha Qiao, Mingzhe Shao, Xianren Zhang, Xiqiao Feng, Qunyang Li, Yanlin Song, Lei Jiang, Jianjun Wang. Guided Self‐Propelled Leaping of Droplets on a Micro‐Anisotropic Superhydrophobic Surface.Angewandte Chemie International Edition, 2016.55, 4265 –4269)