水杨酸钠对DTAB/PAM复合体系自组装行为的影响

doi:10.13218/j.cnki.csdc.2018.06.002

Abstract

Abstract: The effects of sodium salicylate (NaSal) on the self-assembly behavior of the mixed system of polyacrylamide (PAM) and dodecyltrimethylammonium bromide (DTAB) were studied by coarse-grained molecular dynamics simulation.The results indicate that,with the increase of NaSal concentration,the aggregates of DTAB/PAM undergo a shape transition from sphere to rod then to sphere,and the number of DTAB molecules adsorbed onto HPAM chains first increases and then decreases.As for the DTAB/PAM aggregate,the PAM chain is located at the interface between the hydrophobic core and the hydrophilic layer of the DTAB micelle,and the Sal^- ions are inserted into the interior of the micelle.The variations with time of the polymer chains Rg and the number of surfactant molecules in the aggregate can be both divided into three stages.The formation of larger DTAB/PAM aggregates needs longer time.

Key words: surfactant, mixed system, self-assembly, coarse-grained molecular dynamics simulation

CLC Number:

TQ423

CHEN Yu-jia, LIU Jia-xi, ZHU Qian-qian, HU Song-qing, SUN Shuang-qing, WANG Xiu-min. Effects of sodium salicylate on the self-assembly behavior of DTAB/PAM mixed system[J].China Surfactant Detergent & Cosmetics, 2018, 48(6): 308-313.

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Effects of sodium salicylate on the self-assembly behavior of DTAB/PAM mixed system

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