Liu Danqing, Broer Dirk J
Institute for Complex Molecular Systems (ICMS), Eindhoven University of Technology, Den Dolech 2, 5612 AZ Eindhoven, The Netherlands.
Laboratory of Functional Organic Materials and Devices (SFD), Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, Den Dolech 2, 5612 AZ Eindhoven, The Netherlands.
Nat Commun. 2015 Sep 21;6:8334. doi: 10.1038/ncomms9334.
Photoactivated generation of disorder in a liquid crystal network produces free volume that leads to the controlled formation of dynamic corrugations at its surface. The liquid crystal order amplifies the deformation of copolymerized azobenzene, which takes place on molecular length scales, to a micrometre-sized macroscopic phenomenon based on changes in density. We postulate a new mechanism in which continuous oscillating dynamics of the trans-to-cis isomerization of the azobenzene overrules the net conversion, which is currently considered as the origin. This is supported by a significant local density decrease when both the trans and cis isomers are triggered simultaneously, either by dual-wavelength excitation or by the addition of a fluorescent agent converting part of the light to the cis-actuating wavelengths. This new insight provides a general guideline to boost free volume generation leading not only to larger macroscopic deformations but also to controllable and faster non-equilibrium dynamics.
液晶网络中光激活产生的无序会产生自由体积，从而导致其表面动态波纹的可控形成。液晶有序性将共聚偶氮苯在分子长度尺度上发生的变形放大为基于密度变化的微米级宏观现象。我们提出了一种新机制，其中偶氮苯从反式到顺式异构化的连续振荡动力学超越了目前被认为是起源的净转化。当通过双波长激发或添加将部分光转换为顺式激活波长的荧光剂同时触发反式和顺式异构体时，局部密度显著降低，这支持了这一观点。这一新见解提供了一个通用指南，以促进自由体积的产生，不仅导致更大的宏观变形，而且导致可控且更快的非平衡动力学。
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