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• W4200311065 endingPage "128141" @default.
• W4200311065 startingPage "128141" @default.
• W4200311065 abstract "Dynamic covalent chemistry provides numerous possibilities to develop various amphiphiles. However, the design of responsive amphiphiles bearing tunable symmetry based on dynamic covalent bonds is still a challenge. Herein, a dynamic double-tailed surfactant (DDTS) was produced in situ by mixing aldehyde-type amphiphile (N-hexadecyl-N,N-dimethyl-N-(2-(4-formyl-phenoxy)ethyl) ammonium bromide, HOBAB) and commercial octylamine (OA) with a stoichiometric ratio of 1:1. After equilibrium (pH = 10.0), the composition were 68% DDTS, 16% HOBAB and 16% OA. The predominant surfactant in the solution can be reversibly tuned between highly asymmetrical HOBAB and approximately symmetrical DDTS by alternately adding acid (pH = 5.0) and base (pH = 10.0) due to the pH sensitivity of imine bonds. The presence of DDTS significantly decreased the critical micelle concentration, enhanced the adsorption efficiency at the interface and the effectiveness in surface tension reduction, and thermodynamically facilitated the formation of aggregates. More importantly, the emergence of DDTS triggered a transformation from spherical micelles to vesicles, because of the increase in symmetry of the amphiphiles. Once DDTS was disrupted upon decreasing the pH, the opposite transformation ensued. Such a transformation between micelles and vesicles could also be triggered by altering the choice of alkylamine. The present work provides an alternative way to control the transformation between micelles and vesicles, which is favorable for the design of new responsive soft colloids and exploration of their potential applications." @default.
• W4200311065 created "2021-12-31" @default.
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• W4200311065 date "2022-03-01" @default.
• W4200311065 modified "2023-09-25" @default.
• W4200311065 title "Reversible formation/disruption of dynamic double-tailed surfactants in a binary mixture: effects on interfacial properties and aggregation behavior" @default.
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• W4200311065 doi "https://doi.org/10.1016/j.colsurfa.2021.128141" @default.
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