Stimuli-responsive topological change of microstructured surfaces and the resultant variations of wetting properties
ACS Applied Materials and Interfaces(2013)
摘要
It is now well established that topological microstructures play a key role in the physical properties of surfaces. Stimulus-induced variations of topological microstructure should therefore lead to a change in the physical properties of microstructured responsive surfaces. In this paper, we demonstrate that roughness changes alter the wetting properties of responsive organic surfaces. Oriented nematic liquid crystalline elastomers (LCEs) are used to construct the microstructured surfaces via a replica molding technique. The topological microstructure of the surfaces covered with micropillars changes with temperature, due to the reversible contraction of the LCE pillars along the long axis at the nematic-to-isotropic phase transition. This is directly observed for the first time under environmental scanning electron microscopy (E-SEM). A high boiling point liquid, glycerol, is used to continuously monitor the contact angle change with temperature. The glycerol contact angle of the microstructured surfaces covered with small pillars decreases from 118 at room temperature to 80 at 140 C, corresponding to a transition from Cassie state to Wenzel state. © 2013 American Chemical Society.
更多查看译文
关键词
Cassie-Wenzel transition,liquid crystalline elastomers,microstructured surfaces,responsive surfaces,topological structure change,wetting properties
AI 理解论文
溯源树
样例
生成溯源树,研究论文发展脉络