title: Light Responsive Microstructured Surfaces of Liquid Crystalline Network with Shape Memory and Tunable Wetting Behaviors.
abstract: Using adaptive soft materials to fabricate microstructured surfaces renders them with tunable topographic feature and thus controllable physical properties. Here, light responsive microstructured surfaces are reported with shape memory and tunable wetting behaviors; the surfaces are covered with micropillar arrays and constructed by lightly crosslinked azo-containing liquid crystalline network (LCN). UV light irradiation induces 25% contraction in length of the micropillars along their long axes and, as a consequence, the variations of topographic feature and wetting behavior of the surfaces. In addition, the LCNs exhibit shape memory properties, which can freeze the temporary topographic feature of microstructured surfaces (formed under UV irradiation and relatively high temperature) and enable application of their functionalities at mild conditions. This light responsiveness makes it feasible to remotely and precisely tune the local regions of microstructured surfaces, which should broaden the applications of adaptive surfaces in regulating the wetting, optical, and adhesion properties in selected regions.
authors.affiliation: Key Laboratory of Macromolecular Synthesis and Functionalization of Ministry of Education, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou, 310027, China.|Institut Curie, Centre de Recherche, CNRS UMR 168, Université Pierre et Marie Curie, 26 rue d'Ulm, 75248, Paris cedex 05, France.
authors.forename: Zi Liang
authors.initials: ZL
authors.lastname: Wu
authors.affiliation: Key Laboratory of Macromolecular Synthesis and Functionalization of Ministry of Education, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou, 310027, China.
authors.forename: Zhi Jian
authors.initials: ZJ
authors.lastname: Wang
authors.affiliation: Institut Curie, Centre de Recherche, CNRS UMR 168, Université Pierre et Marie Curie, 26 rue d'Ulm, 75248, Paris cedex 05, France.|Department of Chemistry and Soft Materials Research Center, University of Colorado, Boulder, CO, 80309-0215, USA.
authors.forename: Patrick
authors.initials: P
authors.lastname: Keller
authors.affiliation: Key Laboratory of Macromolecular Synthesis and Functionalization of Ministry of Education, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou, 310027, China.
authors.forename: Qiang
authors.initials: Q
authors.lastname: Zheng
mesh_terms: D001391:Azo Compounds / Q000737:chemistry; D050866:Liquid Crystals / Q000737:chemistry* / Q000528:radiation effects; D011108:Polymers / Q000737:chemistry* / Q000528:radiation effects; D013499:Surface Properties; D014466:Ultraviolet Rays; D017155:Wettability
chemical_list: D001391:Azo Compounds; D011108:Polymers
keywords: light response; liquid crystal networks; microstructured surfaces; shape memory; wetting behavior