研究目的
Investigating the light-triggered reversible self-engulfing behavior of Janus nanoparticles derived from block copolymers containing azobenzene liquid crystalline mesogen.
研究成果
The study successfully demonstrates the light-triggered reversible self-engulfing behavior of Janus nanoparticles, offering a novel approach for remote manipulation of controlled encapsulation and release. The findings highlight the potential of these nanoparticles in applications requiring programmable load and release mechanisms.
研究不足
The study is limited to Janus nanoparticles derived from specific block copolymers and may not be generalizable to other systems. The reversible transformation is performed in dispersion, which may limit practical applications requiring solid-state materials.
1：Experimental Design and Method Selection:
The study employs emulsion solvent evaporation to prepare snowman-like Janus nanoparticles from block copolymers containing azobenzene liquid crystalline mesogen. The morphological transformation of these nanoparticles under UV and visible-light irradiation is investigated.
2：Sample Selection and Data Sources:
Janus nanoparticles are derived from PEO114-b-PMAAz48, PEO114-b-PMAAz20, and PEO114-b-PMAAz120 block copolymers. Data is collected through TEM, AFM, DLS, UV-vis spectroscopy, and POM observation.
3：List of Experimental Equipment and Materials:
The experiment utilizes chloroform, CTAB for stabilizing emulsion droplets, and a membrane extruder for nanoparticle preparation.
4：Experimental Procedures and Operational Workflow:
The process involves the preparation of Janus nanoparticles via emulsion solvent evaporation, followed by characterization of their morphological changes under UV and visible-light irradiation.
5：Data Analysis Methods:
The analysis includes monitoring the trans/cis photoisomerization of azobenzene mesogens, measuring nanoparticle size and volume fraction changes, and observing LC phase transitions.
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