标题： 气相介导的微结构表面润湿与吸液控制 显示英文标题

标题： Vapor-mediated wetting and imbibition control on micropatterned surfaces

摘要： 润湿微图案表面在自然界中很常见，并且对于许多技术应用如喷雾冷却、喷墨打印和半导体加工至关重要。 克服固有的、由化学性质和拓扑结构决定的润湿行为通常需要特定的材料，这限制了其适用性。 在这里，我们展示水滴在亲水性表面图案上的扩散和毛细作用可以通过另一种表面张力较低的液体的蒸汽存在来控制。 我们表明，延迟的毛细作用来源于由于蒸汽冷凝产生的马兰戈尼力，与表面拓扑结构的毛细作用力竞争。 因此，宏观液滴可以表现出有效的表观润湿行为，与表面拓扑结构解耦，但与毛细作用薄膜共存，掩盖了图案。 我们展示了如何通过在空间和时间上调节蒸汽浓度可以引导液滴穿过图案，甚至提取吸收的液体，设计出新的涂层、清洁和干燥功能表面设计的策略。 显示英文摘要

摘要： Wetting of micropatterned surfaces is ubiquitous in nature and key to many technological applications like spray cooling, inkjet printing, and semiconductor processing. Overcoming the intrinsic, chemistry- and topography-governed wetting behaviors often requires specific materials which limits applicability. Here, we show that spreading and wicking of water droplets on hydrophilic surface patterns can be controlled by the presence of the vapor of another liquid with lower surface tension. We show that delayed wicking arises from Marangoni forces due to vapor condensation, competing with the capillary wicking force of the surface topography. Thereby, macroscopic droplets can be brought into an effective apparent wetting behavior, decoupled from the surface topography, but coexisting with a wicking film, cloaking the pattern. We demonstrate how modulating the vapor concentration in space and time may guide droplets across patterns and even extract imbibed liquids, devising new strategies for coating, cleaning and drying of functional surface designs.