Concentration-dependent and light-responsive self-assembly of bolaamphiphiles bearing α-cyanostilbene based photochromophore
作者:Yingzhi Jin、Yijun Xia、Shuai Wang、Li Yan、Yi Zhou、Jian Fan、Bo Song
DOI:10.1039/c4sm02392g
日期:——
In this paper, a new bolaamphiphile bearing 1-cyano-1,2-bis(phenyl)ethene (CNBE) has been synthesized. The self-assembly of this molecule in aqueous solution is concentration-dependent. Two distinct morphologies, monomolecular layered lamellas and helical nanofibres have been obtained with the as-prepared molecular configuration. Note worthily, the helical nanofibres provide an experimental evidence for the pure twisted structure in the liquid crystals, which is theoretically proposed by De Gennes. Due to the photoisomerization of CNBE, the self-assembled nanostructures undergo morphological changes upon irradiation. Although various nanostructures were observed in the solution-state, only nanofibres were obtained after the solution was cast on a substrate, which was attributed to a strong dewetting effect. This work illustrates concentration-dependent and light-responsive self-assembly and provides a novel avenue for fabricating smart soft materials.
本文中,我们合成了一种新型双亲分子,该分子含有1-氰基-1,2-双(苯基)乙烯(CNBE)结构。这种分子在水溶液中的自组装行为依赖于浓度。通过预制的分子构型,我们得到了两种不同的形态:单分子层状薄片和螺旋纳米纤维。值得注意的是,螺旋纳米纤维为液晶中的纯扭曲结构提供了实验证据,这一结构理论由De Gennes提出。由于CNBE的光异构化作用,自组装的纳米结构在光照下会发生形态变化。尽管在溶液状态下观察到了多种纳米结构,但当溶液涂布于基板上后,仅获得了纳米纤维结构,这归因于强烈的脱湿效应。这项工作展示了浓度依赖性和光响应性的自组装行为,并为制造智能软材料提供了新的途径。