Bioinspired Multiple Stimuli-Responsive Optical Microcapsules Enabled by Microfluidics
Bioinspired Multiple Stimuli-Responsive Optical Microcapsules Enabled by Microfluidics
复制标题
由微流体技术实现的仿生多重刺激响应光学微胶囊
DOI：
10.1021/acsami.0c14698
复制
发表时间：
2020-10-14
影响因子：
9.5
通讯作者：
Cheng, Zhengdong
中科院分区：
文献类型：
--
作者：
Lin, Pengcheng;Chen, Hongbin;Cheng, Zhengdong
光学微胶囊将光学材料封装在对称的球形限制内，是构建光学单元和光学阵列集成的重要元件。然而，光学微胶囊的多重刺激响应特性仍然是一个挑战，因为光学材料芯和外壳之间存在不可逾越的物理屏障，并且缺乏有效的机制来触发封装的光学材料的动态开关。受变色龙皮肤双模式光学调制的启发，采用微流控乳化和界面聚合技术，组装了一种新型的仿生二元光学微胶囊，该微胶囊结合了手性液晶的可见光反射和稀土配合物的光致发光发射。在微流控芯片中，通过调节注入流体的组成和流速，可以方便地控制光学微胶囊的反射颜色、荧光强度和尺寸。最重要的是，仿生二元光学微胶囊表现出三种可逆的响应行为，热致反射演化，温度依赖性荧光发射，和Fredericks电光响应。由微流体实现的生物启发的多刺激响应光学微胶囊提供了制造下一代智能光学单元和实现混合光子器件的动态响应的模板化策略。
Optical microcapsules encapsulating optical materials inside a symmetric spherical confinement are significant elements for the construction of optical units and the integration of optical arrays. However, the multiple stimuli-responsive characteristic of optical microcapsules still remains a challenge due to the insuperable physical barrier between the optical material core and the outside shell and the lack of effective mechanisms to trigger the dynamic switch of the encapsulated optical materials. Inspired by the dual-mode optical modulation of chameleon skins, a novel biomimetic binary optical microcapsule that combines the visible light reflection of chiral nematic liquid crystals and photoluminescence emission of rare-earth complexes is assembled by microfluidic emulsification and interfacial polymerization. The reflected color, fluorescent intensity, and size of the optical microcapsules are facilely controlled in the microfluidic chip by adjusting the composition and flow rate of the injected fluids. Most importantly, the biomimetic binary optical microcapsules demonstrate three reversible responsive behaviors, thermotropic reflection evolution, temperature-dependent fluorescence emission, and Fredericks electro-optical response. The bioinspired multiple stimuliresponsive optical microcapsules enabled by microfluidics provide a templated strategy to manufacture the next generation of intelligent optical units and to achieve the dynamic response of hybrid photonic devices.