超分子聚合物在螺吡喃水凝胶光驱动中的作用。
Role of supramolecular polymers in photo-actuation of spiropyran hydrogels.
作者信息
Li Chuang, Xiong Qinsi, Clemons Tristan D, Sai Hiroaki, Yang Yang, Hussain Sangji M, Iscen Aysenur, Palmer Liam C, Schatz George C, Stupp Samuel I
机构信息
Department of Polymer Science and Engineering, University of Science and Technology of China Hefei Anhui 230026 China.
Center for Bio-inspired Energy Science, Northwestern University 2145 Sheridan Road Evanston IL 60208 USA.
出版信息
Chem Sci. 2023 May 16;14(22):6095-6104. doi: 10.1039/d3sc00401e. eCollection 2023 Jun 7.
Supramolecular-covalent hybrid polymers have been shown to be interesting systems to generate robotic functions in soft materials in response to external stimuli. In recent work supramolecular components were found to enhance the speed of reversible bending deformations and locomotion when exposed to light. The role of morphology in the supramolecular phases integrated into these hybrid materials remains unclear. We report here on supramolecular-covalent hybrid materials that incorporate either high-aspect-ratio peptide amphiphile (PA) ribbons and fibers, or low-aspect-ratio spherical peptide amphiphile micelles into photo-active spiropyran polymeric matrices. We found that the high-aspect-ratio morphologies not only play a significant role in providing mechanical reinforcement to the matrix but also enhance photo-actuation for both light driven volumetric contraction and expansion of spiropyran hydrogels. Molecular dynamics simulations indicate that water within the high-aspect-ratio supramolecular polymers exhibits a faster draining rate as compared to those in spherical micelles, which suggests that the high-aspect-ratio supramolecular polymers effectively facilitate the transport of trapped water molecules by functioning as channels and therefore enhancing actuation of the hybrid system. Our simulations provide a useful strategy for the design of new functional hybrid architectures and materials with the aim of accelerating response and enhancing actuation by facilitating water diffusion at the nanoscopic level.
超分子-共价杂化聚合物已被证明是一类有趣的体系,可用于在软材料中响应外部刺激产生机器人功能。在最近的工作中,发现超分子组分在光照下可提高可逆弯曲变形和运动的速度。形态学在整合到这些杂化材料中的超分子相中的作用仍不清楚。我们在此报告超分子-共价杂化材料,其将高纵横比的肽两亲物(PA)条带和纤维或低纵横比的球形肽两亲物胶束纳入光活性螺吡喃聚合物基质中。我们发现,高纵横比形态不仅在为基质提供机械增强方面发挥重要作用,而且还增强了光驱动的螺吡喃水凝胶的体积收缩和膨胀的光驱动作用。分子动力学模拟表明,与球形胶束中的水相比,高纵横比超分子聚合物中的水具有更快的排水速率,这表明高纵横比超分子聚合物通过充当通道有效地促进了被困水分子的运输,从而增强了杂化体系的驱动作用。我们的模拟为设计新的功能杂化结构和材料提供了一种有用的策略,旨在通过在纳米尺度上促进水的扩散来加速响应并增强驱动作用。