Most previous publications attempt to control the trapping and release of liquid droplets on a surface through tuning the surface energy of the substrate, for example, by photoisomerization. In this work, the energy barrier between the trapped and released state is raised or lowered by controlling the droplet contact area. This is achieved by designing a dynamically reconfigurable surface where an external stimulus is used to change the surface topography. The system consists of two microstructured components, one being ridges separated by microtrenches and the other a perforated membrane. They are aligned in such a way that the ridges can be raised or lowered through the perforations with the help of a piezo drive. This way the topography changes from surfaces consisting of hills to one consisting of holes – and back again. This dynamic surface reconfiguration changes the contact area such that drops resting or rolling on them become captured or released on demand.

中文翻译：

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通过动态可重构表面控制液滴的捕获和释放

大多数先前的出版物试图通过调整基材的表面能（例如通过光异构化）来控制表面上液滴的捕获和释放。在这项工作中，通过控制液滴接触面积来升高或降低捕获态和释放态之间的能垒。这是通过设计动态可重构表面来实现的，其中使用外部刺激来改变表面形貌。该系统由两个微结构组件组成，一个是由微沟槽分隔的脊，另一个是穿孔膜。它们的排列方式使得脊可以在压电驱动器的帮助下通过穿孔升高或降低。这样，地形就会从由山丘组成的表面变为由洞穴组成的表面，然后再变回来。这种动态表面重新配置改变了接触面积，使得停留或滚动在其上的液滴根据需要被捕获或释放。