MOE Key Laboratory of Macromolecule Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, 310027, Hangzhou, P. R. China.
Small. 2019 Mar;15(9):e1804867. doi: 10.1002/smll.201804867. Epub 2019 Jan 24.
Although many approaches have been developed to encapsulate functional species into polyelectrolyte films, few of them can effectively control the final distribution of these ones. Herein, a facile strategy is proposed to spatially control the encapsulation of guest species by locally regulating the structural transformation of polyelectrolyte films. Patterned porosity is created within a film by cross-linking it selectively and then immersing it in an acidic solution. These porous regions can exhibit significantly different properties from other regions, including the ability to wick solution, a greater retention of guest species, and the capability of structural transformation. After loading guest species, the porous structures can be eliminated at saturated humidity to encapsulate the guest species into the film, leading to their patterned distribution across the film. Based on this method, various guest species, ranging from fluorescent dyes to nanoparticles, can be locally encapsulated into polyelectrolyte film, forming distinct patterns of arbitrary shapes and sizes and thus paving the way for further applications.
尽管已经开发出许多方法将功能物种封装在聚电解质膜中，但很少有方法可以有效地控制这些物种的最终分布。在此，提出了一种通过局部调节聚电解质膜的结构转变来空间控制客体物种封装的简便策略。通过选择性交联膜并随后将其浸入酸性溶液中，在膜内创建具有图案的多孔性。与其他区域相比，这些多孔区域具有明显不同的性质，包括吸液能力、对客体物种的更大保留以及结构转变的能力。在负载客体物种后，可以在饱和湿度下消除多孔结构，将客体物种封装到膜中，从而导致它们在膜中呈现出图案化分布。基于这种方法，可以将各种客体物种（从荧光染料到纳米粒子）局部封装到聚电解质膜中，形成各种形状和大小的独特图案，从而为进一步的应用铺平道路。
