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    Interfacial self-assembled behavior of pH/light-responsive host-guest alginate-based supra-amphiphiles for controlling emulsifying property

    Year: 2021

    Journal: Carbohydr. Polym., Volume 266, AUG 15

    Authors: Yang, Shujuan; Qin, Wenqi; Zhao, Xinyu; He, Furui; Gong, Houkui; Liu, Yuanyuan; Feng, Yuhong; Zhou, Yang; Yu, Gaobo; Li, Jiacheng

    Organizations: Key Projects in the Hainan provincial Science & Technology Program [ZDYF2020191]; National Natural Science Foundation of China [22068011, 22007025, 21706045]; Natural Science Foundation of Hainan Province [220MS006, 220QN182]; Hainan University [KYQD (ZR) 20041, KYQD (ZR) 20040]

    Keywords: Interfacial host-guest interaction; Polymeric supra-amphiphile; Amphiphilic sodium alginate; Multiscale strategy; Pickering emulsion

    Soft emulsifiers with relatively suitable structural controllability are necessarily required for the preparation of multifunctional Pickering emulsions. Herein, a beta-cyclodextrin-grafted alginate/azobenzene-functionalized dodecyl (Alg-beta-CD/AzoC. 12) polymeric supra-amphiphile was designed based on the host-guest interfacial self-assembly. As compared with Alg-beta-CD amphiphilic polymers, the interfacial tension of Alg-beta-CD/AzoC12 supra-amphiphilic assemblies reduced from 29.57 mN/m to 0.18 mN/m, indicating the great amphiphilicity derived from Alg-beta-CD/AzoC12 supra-amphiphilic assemblies. With the increase of pH, the interfacial microstructures transformed from flocculated structures, spherical structures into deformed structures. Especially, the spherical microstructures with the highest interfacial viscoelasticity and thickness demonstrated the highest emulsifying efficiency due to the steric hindrance mechanism. Moreover, the interfacial elastic modulus of adsorbed layers exhibited similar to 4 times of that upon the ultraviolet illumination. These results disclosed that the interfacial microstructures could be readily regulated by the tunable amphiphilicity of Alg-beta-CD/AzoC12 assemblies, which would be useful for the applications of Pickering emulsions in numerous fields.
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