临界胶束浓度
表面张力
铵
酰胺
反离子
试剂
化学
胶束
烷基
胶束化热力学
有机化学
水溶液
量子力学
物理
离子
作者
Xinru Jia,Ran Wei,Bo Xu,Hongqin Liu,Baocai Xu
出处
期刊:ACS omega
[American Chemical Society]
日期:2022-12-15
卷期号:7 (51): 48240-48249
被引量:7
标识
DOI:10.1021/acsomega.2c06353
摘要
A series of amide quaternary ammonium surfactants with the formula C n H2n+1CONH(CH2)2N+(CH3)3·CH3CO3- (n = 9, 11, 13, 15) were synthesized using a fatty acid, N,N-dimethylethylenediamine, and a green reagent dimethyl carbonate. A comparative study of the four surfactants in terms of surface activity, aggregation characteristics, and foam properties was conducted. The results show that these amide quaternary ammonium surfactants reduce the surface tension of water to a minimum value of 23.69 mN·m-1 at a concentration of 1.55 × 10-4 mol·L-1 and self-assemble spontaneously into aggregates, which are mostly vesicles. Furthermore, with increasing the alkyl chain length, their critical micelle concentration (CMC) values and surface tension values at the CMC (γCMC) decrease and then increase, and the degree of counterion binding (β) decreases. It is also found that these amide quaternary ammonium surfactants exhibit excellent foam ability and foam stability.
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