Photoswitching between Water‐Tolerant Adhesion and Swift Release by Inverting Liquid Crystal Fingerprint Topography,Advanced Science

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Photoswitching between Water‐Tolerant Adhesion and Swift Release by Inverting Liquid Crystal Fingerprint Topography
Advanced Science ( IF 14.3 ) Pub Date : 2021-02-18 , DOI: 10.1002/advs.202004051
Wei Feng ₁ , Liangyong Chu ₂ , Matthijn B de Rooij ₂ , Danqing Liu _{1,

3} , Dirk J Broer _{1,

3}

Affiliation

Although switchable adhesive surfaces are important and desirable for soft robotics, it is still challenging to replicate nature's switchable adhesion capability on artificial surfaces, especially for underwater applications. Here polymeric coatings with fingerprint topographies that are capable of switching the surface adhesion upon light illumination are reported. This is achieved via a synergistic combination of surface topographical inversion and spatially selective distribution of adhesive polymers. The surface topographical inversion is accomplished by the anisotropic deformation of the fingerprint‐configured liquid crystal network (LCN) coating upon light‐controlled order parameter modulation. Adhesive and nonadhesive polymers are spatial‐selectively arranged on top of the LCN coating following the alternating homeotropic and planar domains, respectively, where liquid crystal mesogens are orthogonally aligned. The adhesive part is composed of a water‐tolerant adhesive polymer with 3,4‐dihydroxy‐l‐phenylalanine (catechol) groups inspired by mussel byssus. This report presents a dynamic surface with locally alternating nonadhesive indented areas and adhesive elevated areas where the topographical positions can be dynamically changed with light illumination which can serve as smart skins for robotic applications.

中文翻译：

通过反转液晶指纹形貌实现耐水粘附和快速释放之间的光转换

尽管可切换粘合表面对于软机器人来说非常重要且令人向往，但在人造表面上复制自然界的可切换粘合能力仍然具有挑战性，特别是对于水下应用。这里报道了具有指纹形貌的聚合物涂层，能够在光照射下切换表面粘附力。这是通过表面形貌反转和粘合剂聚合物的空间选择性分布的协同组合来实现的。表面形貌反转是通过光控有序参数调制的指纹配置液晶网络（LCN）涂层的各向异性变形来完成的。粘性和非粘性聚合物分别在交替的垂直域和平面域之后空间选择性地排列在 LCN 涂层的顶部，其中液晶介晶正交排列。粘合剂部分由具有 3,4-二羟基-苯丙氨酸（儿茶酚）基团的耐水粘合剂聚合物组成，其灵感来自于贻贝足丝。该报告提出了一种动态表面，具有局部交替的非粘性凹进区域和粘性升高区域，其中地形位置可以通过光照动态改变，可以用作机器人应用的智能皮肤。

更新日期：2021-04-22

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