Reversible Electronic Patterning of a Dynamically Responsive Hydrogel Medium
Reversible Electronic Patterning of a Dynamically Responsive Hydrogel Medium
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DOI：
10.1002/adfm.202302549
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发表时间：
2023-05
影响因子：
19
通讯作者：
Chen Yang;Yi Liu;Manya Wang;Hui Hu;Zhongtao Zhao;Hongbing Deng;G. Payne;Xiaowen Shi
中科院分区：
文献类型：
--
作者：
Chen Yang;Yi Liu;Manya Wang;Hui Hu;Zhongtao Zhao;Hongbing Deng;G. Payne;Xiaowen Shi
动态响应水凝胶介质由两种自组装组分制备，即多糖（壳聚糖）和表面活性剂（十二烷基硫酸钠; SDS）。结果表明，这种介质可以使用电极“笔”图案化，以重新配置超分子结构：阴极写入诱导中性壳聚糖链形成结晶网络，而阳极写入产生阳离子壳聚糖链，静电交联与阴离子SDS胶束。这两种超分子结构都是可重新配置的，并且每一种都通过结构诱导的壳聚糖pKa变化而稳定，因此可以擦除电子写入的图案，可以写入新的图案，并且可以在三维中写入图案。此外，它表明，NaCl诱导的SDS胶束的形态转变允许图案可逆地隐藏或显示。为了证明这种介质用于信息存储的多功能性，快速响应（QR）码被电子地写入，并且示出了该码可以被标准手机应用程序识别。通过模糊图案）或通过使图案渐逝（即，使图案不可见）。总的来说，这项工作表明，由简单，安全和可持续的组件组成的动态响应介质可以使用自上而下的电子输入进行空间和定量控制的可逆模式化。
A dynamically responsive hydrogel medium is prepared from two self‐assembling components, a polysaccharide (chitosan) and a surfactant (sodium dodecyl sulfate; SDS). It is shown that this medium can be patterned using an electrode “pen” to reconfigure supramolecular structure: cathodic writing induces neutral chitosan chains to form a crystalline network, while anodic writing generates cationic chitosan chains that electrostatically crosslink with anionic SDS micelles. Both supramolecular structures are re‐configurable and each is stabilized by structure‐induced shifts in chitosan's pKa, thus electronically written patterns can be erased, new patterns can be written, and patterns can be written in three dimensions. Further, it is shown that NaCl‐induced morphological transitions of the SDS micelles allow patterns to be reversibly concealed or revealed. To demonstrate the versatility of this medium for information storage, a quick response (QR) code is electronically written and it is shown that this code can be recognized by a standard cellphone app. This QR code can be concealed by making the medium opaque (i.e., by obscuring the pattern) or by making the pattern evanescent (i.e., by making pattern invisible). Overall, this work demonstrates that a dynamically responsive medium composed of simple, safe and sustainable components can be reversibly patterned with spatial and quantitative control using top‐down electronic inputs.