期刊
ACS MACRO LETTERS
卷 7, 期 12, 页码 1475-1479出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsmacrolett.8b00750
关键词
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资金
- National Natural Science Foundation of China [51272010, 51472018]
- Beijing Nova Program [XX2013009]
- Fundamental Research Fund for the Central Universities
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.
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