Han Yang, Guo Yunzhou, Nakajima Tasuku, Gong Jian Ping
Graduate School of Life Science, Hokkaido University, Sapporo 001-0021, Japan.
ZJU-Hangzhou Global Scientific and Technological Innovation Center, Zhejiang University, Hangzhou 311215, China.
ACS Appl Mater Interfaces. 2023 Nov 29. doi: 10.1021/acsami.3c14334.
We report a thermoresponsive anisotropic photonic hydrogel: poly(dodecyl glyceryl itaconate)/polyacrylamide-poly(-isopropylacrylamide) hydrogel (PDGI/PAAm-PNIPAM hydrogel). Hydrogels with uniaxially aligned lamellar bilayers possess bright structural color and swelling anisotropy, while PNIPAM-based hydrogels exhibit distinct thermoresponsive properties around a lower critical solution temperature (LCST). Hybridization of thermoresponsive PNIPAM with the lamellar hydrogel can give the anisotropic photonic hydrogel various fascinating thermoresponsive properties, such as structural color/turbid transition, thermoresponsive structural color, and anisotropic deswelling/reswelling behavior by temperature stimuli. The temperature-induced changes in turbidity, structural color, and anisotropic swelling of the gel around the LCST can be tuned by controlling the incorporated PNIPAM density. PNIPAM can be regioselectively incorporated into the specific region of the lamellar hydrogels by photomasking during UV polymerization. The PDGI/PAAm-PNIPAM hydrogel can find diverse promising applications such as smart windows and smart displays.
聚（十二烷基甘油衣康酸酯）/聚丙烯酰胺-聚（N-异丙基丙烯酰胺）水凝胶（PDGI/PAAm-PNIPAM水凝胶）。具有单轴排列层状双分子层的水凝胶具有明亮的结构颜色和溶胀各向异性，而基于PNIPAM的水凝胶在较低临界溶液温度（LCST）附近表现出独特的热响应特性。热响应性PNIPAM与层状水凝胶的杂化可以赋予各向异性光子水凝胶各种迷人的热响应特性，如结构颜色/浊度转变、热响应结构颜色以及通过温度刺激实现的各向异性去溶胀/再溶胀行为。通过控制掺入的PNIPAM密度，可以调节凝胶在LCST附近由温度引起的浊度、结构颜色和各向异性溶胀的变化。在紫外光聚合过程中，通过光掩膜可以将PNIPAM区域选择性地掺入层状水凝胶的特定区域。PDGI/PAAm-PNIPAM水凝胶可用于多种有前景的应用，如智能窗户和智能显示器。
