Role of supramolecular polymers in photo-actuation of spiropyran hydrogels.
Role of supramolecular polymers in photo-actuation of spiropyran hydrogels.
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DOI：
10.1039/d3sc00401e
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发表时间：
2023-06-07
期刊：
影响因子：
8.4
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中科院分区：
文献类型：
--
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超分子-共价杂化聚合物已被证明是一种有趣的系统，可以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，发现超分子组分在暴露于光时可以提高可逆弯曲变形和运动的速度。形态的作用，在超分子相集成到这些混合材料仍然不清楚。我们在这里报告的超分子共价杂化材料，将高纵横比的肽两亲物（PA）的丝带和纤维，或低纵横比的球形肽两亲物胶束到光活性螺吡喃聚合物基质。我们发现，高纵横比的形态不仅发挥了重要作用，在提供机械加固的矩阵，但也增强光驱动的体积收缩和膨胀的螺吡喃水凝胶的光驱动。分子动力学模拟表明，高纵横比的超分子聚合物内的水表现出更快的排水速率相比，在球形胶束，这表明，高纵横比的超分子聚合物有效地促进被困水分子的运输作为通道，从而提高驱动的混合系统。我们的模拟提供了一个有用的策略，为新的功能混合架构和材料的设计，其目的是加速响应和增强驱动，促进水在纳米级的扩散。超分子-共价杂化螺吡喃水凝胶被开发用于响应于光产生机器人功能。超分子相的形态被发现在这些混合水凝胶的机械光致驱动中起着关键作用。
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. Supramolecular-covalent hybrid spiropyran hydrogels are developed to generate robotic functions in response to light. The morphology of supramolecular phases is found to play a critical role in mechanical photo-actuation of these hybrid hydrogels.
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