Hou Xiaojuan, Guan Song, Qu Ting, Wu Xuefei, Wang Dong, Chen Aihua, Yang Zhenzhong
School of Materials Science and Engineering, Beihang University, Beijing 100191, People's Republic of China.
State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, People's Republic of China.
ACS Macro Lett. 2018 Dec 18;7(12):1475-1479. doi: 10.1021/acsmacrolett.8b00750. Epub 2018 Nov 29.
Block copolymers containing azobenzene liquid crystalline (LC) mesogen are used to prepare snowman-like Janus nanoparticles (NPs) by emulsion solvent evaporation. The azobenzene-containing poly(methacrylate) (PMAAz) head of the Janus NPs is in the smectic LC phase with ordered stripes, which becomes amorphous and enlarged due to trans/cis transformation under UV irradiation. The expanded PMAAz can consequently engulf the other head. The self-engulfed NPs can recover to their original state in both shape and LC state via visible-light irradiation. This strategy is promising for programmable load and release of different payloads by remote trigger using light.
含有偶氮苯液晶（LC）介晶的嵌段共聚物通过乳液溶剂蒸发法用于制备雪人状的Janus纳米粒子（NPs）。Janus NPs含偶氮苯的聚（甲基丙烯酸酯）（PMAAz）头部处于具有有序条纹的近晶LC相中，在紫外线照射下由于反式/顺式转变而变得无定形且膨胀。膨胀的PMAAz随后可以吞噬另一个头部。通过可见光照射，自吞噬的NPs在形状和LC状态上都可以恢复到原始状态。这种策略有望通过使用光的远程触发对不同的有效载荷进行可编程的负载和释放。
