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    Tuning Supramolecular Polymers' Amphiphilicity via Host-Guest Interfacial Recognition for Stabilizing Multiple Pickering Emulsions

    Year: 2021

    Journal: ACS Appl. Mater. Interfaces, Volume 13, NOV 3, page 51661–51672

    Authors: Yang, Shujuan; Qin, Wenqi; He, Furui; Zhao, Xinyu; Zhou, Qichang; Lin, Feilin; Gong, Houkui; Zhang, Siqi; Yu, Gaobo; Feng, Yuhong; Li, Jiacheng

    Organizations: Key Projects in the Hainan Provincial Science & Technology Program [ZDYF2020191]; National Natural Science Foundation of China [22068011]

    Keywords: supra-amphiphilic host-guest polymers; multiple Pickering emulsion; tunable amphiphilicity; controllable phase behaviors; anisotropic structures

    Supramolecular host-guest chemistry bridging the adjustable amphiphilicity and macromolecular self-assembly is well advanced in aqueous media. However, the interfacial self-assembled behaviors have not been further exploited. Herein, we designed a beta-cyclodextrin-grafted alginate/azobenzene-functionalized dodecyl (Alg-beta-CD/AzoC12) supra-amphiphilic system that possessed tunable amphiphilicity by host-guest interfacial self-assembly. Especially, supra-amphiphilic aggregates could be utilized as highly efficient soft colloidal emulsifiers for stabilizing water-in-oil-water (W/O/W) Pickering emulsions due to the excellent interfacial activity. Meanwhile, the assembled particle structures could be modulated by adjusting the oil-water ratio, resulting from the tunable aggregation behavior of supra-amphiphilic macromolecules. Additionally, the interfacial adsorption films could be partially destroyed/reconstructed upon ultraviolet/visible irradiation due to the stimuli-altering balance of amphiphilicity of Alg-beta-CD/AzoC12 polymers, further constructing the stimulus-responsive Pickering emulsions. Therefore, the supramolecular interfacial self-assembly-mediated approach not only technologically advances the continued development of creative templates to construct multifunctional soft materials with anisotropic structures but also serves as a creative bridge between supramolecular host-guest chemistry, colloidal interface science, and soft material technology.
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