Journal
LANGMUIR
Volume 38, Issue 4, Pages 1611-1620Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.langmuir.1c03111
Keywords
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Funding
- Research Fund Program of the Guangdong Provincial Key Laboratory of Functional and Intelligent Hybrid Materials and Devices [2019B121203003]
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Giant amphiphiles containing azobenzene and polyhedral oligomeric silsesquioxane units were synthesized and showed photoresponsive behavior under UV irradiation. The phase transition behaviors of these giant amphiphiles on the water surface differed depending on the isomer composition.
Giant amphiphiles containing azobenzene and polyhedral oligomeric silsesquioxane (POSS) units are synthesized by linking 4,4'-azodianiline (ADA) and POSS derivatives by stepwise amidation and further modification. The synthesized giant amphiphiles are photoresponsive and show trans-cis isomerization under ultraviolet (UV) irradiation. These giant amphiphiles are spread on the air-water interface and compressed by the barrier without and under UV irradiation. By compression, the giant amphiphiles undergo a phase transition from gas (G), liquid expanded (LE), liquid condensed (LC), and solid (S) to a final collapse on the water surface. The giant amphiphiles are cis-isomer-rich under UV irradiation and are trans-isomer-rich without UV irradiation. The trans-isomers are straight-shaped, while the cis-isomers are bent, and hence, their phase transition behaviors on the water surface exhibit a distinct difference.
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