Dynamic behavior of water droplets on flexible, adaptive and switchable surfaces generated using surface attached polymer networks and brushes

优先计划研究项目的总体目标是生成具有量身定制的化学和地形的衬底表面，该表面可以动态响应环境的变化，并研究简单液体在这种可重新配置的表面上的润湿行为。我们的目标是更深入地了解这类液体在可切换/基材上的润湿和除湿动力学。我们将主要关注实验方法，但也将在优先计划内合作将结果与理论分析相结合。我们将主要遵循两个概念：1.我们将生成基材，其中选择了特定的表面形貌，并调整了表面化学以允许动态变化，例如通过异构化反应允许以动态方式改变表面能量，从而改变润湿行为。2.我们将生成衬底，其中选择了特定的表面化学物质，并通过微工程工具使表面可重新配置，例如。通过外部刺激或在液体接触过程中表面变形的情况下，表面形貌被系统地从光滑切换到粗糙。在某些情况下，切换过程将由润湿液体本身诱导，从而获得响应/自适应表面。在资助期结束时，这两条线将通过产生多个刺激响应面而结合在一起，其中一个刺激作用于表面化学/表面极性，另一个作用于地形。在其他情况下，设想将开发的技术用作工具箱，其中将两个项目线中的表面特征(刺激响应性表面化学和刺激响应性地形)相结合以生成动态可重新配置的表面，其中动态变化对润湿行为具有非常强烈的影响。

The overarching goal of the research project within the Priority Program is to generate substrate surfaces with a tailor-made chemistry and topography which can respond dynamically to changes in the environment and to study the wetting behavior of simple liquids on such reconfigurable surfaces. We will aim to obtain a deeper insight into dynamics of wetting as well as dewetting of such liquids on switchable/ substrates. We will focus primarily on experimental methods but will also combine results with theoretical analyses in collaboration within the priority program. We will follow essentially two concept lines: 1. We will generate substrates where a specific surface topography is chosen and the surface chemistry is adjusted to allow dynamic changes through e.g. isomerization reactions which allow to change the surface energy and thus the wetting behavior in a dynamic way. 2. We will generate substrates, where a certain surface chemistry is chosen and the surface is made reconfigurable through microengineering tools, eg. the surface topography is systematically switched from smooth to rough through an external stimulus or where the surface is becoming deformed in the course of liquid contact. In some cases the switching process will be induced by the wetting liquid itself so that responsive/adaptive surfaces are obtained. Towards the end of the funding period the two lines will be brought together either by generating multiple-stimulus responsive surface, where one stimulus acts on the surface chemistry/ surface polarity and one on the topography. In other cases it is envisioned to use the developed technologies as a toolbox, where features of the surfaces in the two project lines (stimulus responsive surface chemistry and stimulus responsive topography) are combined to generate dynamically reconfigurable surfaces, where the dynamic changes have a very strong impact on the wetting behavior.