Light-Driven Expansion of Spiropyran Hydrogels,Journal of the American Chemical Society

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Light-Driven Expansion of Spiropyran Hydrogels
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2020-04-24 , DOI: 10.1021/jacs.0c02201
Chuang Li ₁ , Aysenur Iscen ₂ , Liam C Palmer _{1,

3} , George C Schatz _{2,

3} , Samuel I Stupp _{1,

3,

4,

5,

6}

Affiliation

The incorporation of molecular switches in organic structures is of great interest in the chemical design of stimuli-responsive materials that mimic the complex functions of living systems. Merocyanine dyes that convert to spiropyran moieties upon exposure to visible light have been extensively studied as they can be incorporated in hydrated covalent networks that will expel water when this conversion occurs and induce a volumetric shrinkage. We report here on a sulfonate-based water-soluble photoswitch that, in contrast to the well-known systems, triggers a volumetric expansion in hydrogels upon exposure to photons. Contraction is in turn observed under dark conditions in a highly reversible manner. The novel behavior of the photoswitch incorporated in the covalent network was predicted by coarse-grained simulations of the system's chemical structure. Using pH control and polymeric structures that differ in lower critical solution temperature, we were able to develop hydrogels with highly tunable volumetric expansion. The novel molecular function of the systems developed here led to materials with the negative phototaxis observed in plants and could expand the potential use of hydrogels as sensors, soft robots, and actuators.

中文翻译：

螺吡喃水凝胶的光驱动膨胀

在有机结构中加入分子开关对模拟生命系统复杂功能的刺激响应材料的化学设计非常感兴趣。暴露于可见光时转化为螺吡喃部分的部花青染料已被广泛研究，因为它们可以结合到水合共价网络中，当这种转化发生时，会排出水并引起体积收缩。我们在此报告了一种基于磺酸盐的水溶性光开关，与众所周知的系统相比，它在暴露于光子时会触发水凝胶的体积膨胀。反过来，在黑暗条件下以高度可逆的方式观察到收缩。通过系统的粗粒度模拟来预测共价网络中包含的光开关的新行为 s 化学结构。使用 pH 控制和在较低临界溶液温度下不同的聚合物结构，我们能够开发出具有高度可调体积膨胀的水凝胶。这里开发的系统的新分子功能导致在植物中观察到具有负趋光性的材料，并可以扩大水凝胶作为传感器、软机器人和执行器的潜在用途。

更新日期：2020-04-24

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