期刊
JOURNAL OF SURFACTANTS AND DETERGENTS
卷 18, 期 3, 页码 421-428出版社
WILEY
DOI: 10.1007/s11743-014-1666-2
关键词
Surface active ionic liquid; Symmetry; Surface adsorption; Micellar formation
资金
- National Natural Science Foundation of China [21373128]
- Scientific and Technological Projects of Shandong Province of China [2014GSF117001]
- Natural Science Foundation of Shandong Province of China [ZR2011BM017]
- Sinopec [P13045]
The self-aggregation behavior of catanionic surface active ionic liquids (SAIL), 1-alkyl-3-methylimidazolium alkyl sulfates, [C(4)mim][C16SO4] and [C(6)mim][C14SO4], in aqueous solutions was explored by several techniques. These results were analyzed together with the concerning data of [C(8)mim][C12SO4] reported previously. The feature of these SAIL is that the total carbon number of the hydrophobic chains is kept constant, while only the length of the two hydrocarbon chains varies. Because of the different intermolecular and intramolecular interactions, the hydrophobic interaction of asymmetrical SAIL is enhanced, which explains the minimal CMC value of [C(4)mim][C16SO4]. Thermal motion of hydrocarbon chains at the air-water interface leads to higher A (min) and lower I(max) values with the increasing asymmetry of two hydrophobic chains. The conductivity measurements reveal that the micellization process is spontaneous and entropy-driven in the studied temperature range. This work indicates that the symmetry of alkyl chains can influence the aggregation behavior of [C (n) mim][C (m) SO4] in aqueous solutions.
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