Interfacial and aggregation behavior of dicationic and tricationic ionic liquid-based surfactants in aqueous solution

被引:37
|
作者
Nacham, Omprakash [1 ]
Martin-Perez, Armide [2 ]
Steyer, Daniel J. [1 ]
Trujillo-Rodriguez, Maria J. [2 ]
Anderson, Jared L. [1 ]
Pino, Veronica [2 ]
Afonso, Ana M. [2 ]
机构
[1] Univ Toledo, Sch Green Chem & Engn, Dept Chem & Biochem, Toledo, OH 43606 USA
[2] Univ La Laguna, Sect Analit, Dept Quim, San Cristobal la Laguna 38206, Tenerife, Spain
基金
美国国家科学基金会;
关键词
Ionic liquid-based surfactants; Dicationic ionic liquids; Tricationic ionic liquids; Cationic surfactants; Critical micelle concentration; Aggregation number; MICELLE FORMATION; 1-DECYL-3-METHYLIMIDAZOLIUM BROMIDE; WATER; MICELLIZATION; ADSORPTION; SALTS;
D O I
10.1016/j.colsurfa.2015.01.026
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The interfacial and aggregation behavior of three dicationic and two tricationic ionic liquid-based (IL) surfactants in aqueous solutions have been carried out. The studied dicationic IL-based surfactants were 1,12di( 3-butylimidazolium) dodecane bromide ((C(4)Im)(2) C-12-2Br), 1,12-di(3-decylimidazolium) dodecane bromide ((C(10)Im)(2) C-12-2Br), and 1,12-di(3-hexadecylimidazolium) dodecane bromide ((C(16)Im)(2) C-12-2Br). Twoclasses of trigonal tricationic surfactants containing triethylamine (Am) and 1,3,5-trimethylbenzene (Bn) cores were synthesized for first time and characterized, specifically, 3,3 ',3 " -octyl-1,1',1" -(2-ethylamino) imidazolium bromide ((C(8)Im)(3)Am-3Br), and 3,3',3"-octyl-1,1',1" -(1,3,5) tris(methylene) benzene imidazolium bromide ((C(8)Im)(3)Bn-3Br). The critical micelle concentration (CMC) values and other aggregation parameters, including adsorption efficiency (pC(20)), surface tension at the CMC (gamma(cmc)), degree of dissociation (alpha), and the degree of counterion binding in the micelle (beta) were obtained using a variety of techniques including surface tension, conductivity, and fluorescence measurements. For the first time, the aggregation numbers (N-agg) were also obtained for this group of surfactants. A study into the influence of acetonitrile on the stability and aggregation behavior of dicationic and tricationic IL-based surfactants was also undertaken. The CMC values of the dicationic surfactants clearly decrease as a function of the side chain, when the same linker is maintained. The CMC values of the tricationic surfactants were lower than analogous linear trimeric surfactants. For the novel tricationic surfactants, the effect of sodium salts(C6H5COONa, NaBr, and NaI) on the surface activity was also investigated. It was also observed that the surface activity parameters (pC(20)and CMC/C-20) of tricationic surfactants increased significantly in the presence of added electrolytes. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码:224 / 234
页数:11
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