Yue Youfeng, Li Xufeng, Kurokawa Takayuki, Anamul Haque Md, Gong Jian Ping
Graduate School of Life Science, and Faculty of Advanced Life Science, Hokkaido University, Sapporo 060-0810, Japan.
J Mater Chem B. 2016 Jun 21;4(23):4104-4109. doi: 10.1039/c6tb00619a. Epub 2016 May 23.
This work developed a photonic hydrogel that is responsive to, and can distinguish between two stimuli of stress and pH. Patterning is used to locally change the chemistry of a one-dimensional (1D) photonic gel, such that the native region is responsive to mechanical stress while the chemically modified region is responsive to both mechanical stress and pH. By combining the optical signals in the native region and the modified region, one can distinguish the stimuli between pH and stress. Specifically, the native 1D photonic gel is composed of periodically aligned polymeric bilayers in a soft polyacrylamide (PAAm) network. The chemical modification is done by partially hydrolyzing PAAm into sodium polyacrylic acid in some patterned regions, which imparts pH sensitivity, in addition to the stress sensitivity, to these regions.
这项工作开发了一种对压力和pH值这两种刺激有响应且能区分它们的光子水凝胶。图案化用于局部改变一维（1D）光子凝胶的化学性质，使得天然区域对机械应力有响应，而化学修饰区域对机械应力和pH值都有响应。通过组合天然区域和修饰区域的光信号，人们可以区分pH值和应力之间的刺激。具体而言，天然的1D光子凝胶由在柔软的聚丙烯酰胺（PAAm）网络中周期性排列的聚合物双层组成。化学修饰是通过在一些图案化区域将PAAm部分水解为聚丙烯酸钠来完成的，这除了赋予这些区域应力敏感性外，还赋予了pH敏感性。
