Wetting of structured surfaces with switchable topography and mechanical properties

具有可切换形貌和机械性能的结构化表面的润湿

• 批准号: 422917268
• 负责人: Professor Dr. Leonid Ionov
• 金额: --
• 依托单位: Professur für Biofabrication
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/422917268?language=en
• 关键词: Wetting; structured; surfaces; switchable; topography

The interaction of liquids with structured surfaces can have different character - either topography can determine wetting if the surface structures are hard, or topography affects wetting and the droplet shape affects the surface topography if the elastic forces and surface tension are comparable with each other. Depending on the size of surface structures and their elastic modulus, either surfaces tension or elastic force can dominate – this transition from domination of elastic force to counteraction of elastic and surface tension force was studied in the first funding period. In particular, we developed a method for fabrication of surface structures with the shape of lamellae with high aspect ratio from polymers with switchable mechanical properties and shape memory behavior. Surface structures either could or could not adapt to the droplet shape depending on the state of the polymer, and we demonstrated that the wetting properties depend on the deformability of the surface structures. In the second funding period, we will make a step forward and develop new method for fabrication of structured surfaces with actively switchable topography and will investigate how counteraction of elastic force and surface tension will affect switching of topography and switching of wetting behavior. Advanced combination of 3D-printing and electrospinning – melt electrowriting will be used to print complex structures using reversibly swelling and two-way shape memory polymers. We will also develop new methodology for acquiring 3D shape of droplet and will use it for studying of wetting on surfaces with switchable topography. The experimental results obtained in this project will be validated by models developed in cooperation with other members of SPP 2171.

液体与结构表面的相互作用可以具有不同的特征--如果表面结构坚硬，则地形决定润湿，或者如果弹性力和表面张力彼此相当，则地形影响润湿，液滴形状影响表面形貌。根据表面结构的大小及其弹性模数的不同，表面张力或弹性力可能占主导地位--从弹性力主导到弹性和表面张力相互抵消的转变在第一个资助期进行了研究。特别是，我们开发了一种由具有可切换机械性能和形状记忆行为的聚合物制备具有大长宽比的片层形状的表面结构的方法。表面结构可以或不能适应液滴的形状，这取决于聚合物的状态，我们证明了润湿性能取决于表面结构的变形能力。在第二个资助期，我们将向前迈进一步，开发制造具有主动可切换地形的结构化表面的新方法，并将研究弹性力和表面张力的相互作用如何影响地形切换和润湿行为的切换。3D打印和电纺熔融电写的先进组合将被用来打印使用可逆膨胀和双向形状记忆聚合物的复杂结构。我们还将开发获取液滴三维形状的新方法，并将其用于研究可切换地形表面的润湿。本项目中获得的实验结果将通过与SPP 2171其他成员合作开发的模型进行验证。