کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5410501 1506558 2015 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Aggregation behavior of dodecylsulfonate-based surface active ionic liquids in water
ترجمه فارسی عنوان
رفتار همزیستی مایعات یون فعال در سطح دودسیل سولفونات در آب
کلمات کلیدی
سطح مایع فعال یونی الکترولیت آلی، جذب سطحی، شکل گیری میله ای،
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
چکیده انگلیسی
Halogen-free, low-cost alkylsulfonate-based surface active ionic liquid (SAIL), 1-butyl-3-methylimidazolium dodecylsulfonate ([C4mim][C12H25SO3]) was easily synthesized through ion exchange reaction. Its self-aggregation behavior was systematically investigated by surface tension and electric conductivity measurements. [C4mim][C12H25SO3] has rather lower cmc than the traditional ionic surfactant, sodium dodecylsulfonate (SDDS), while it has higher cmc than the anionic SAIL, 1-butyl-3-methylimidazolium dodecylsulfate ([C4mim][C12H25SO4]), with the same hydrocarbon chain length. The negative ΔGmθ values, mainly result from more negative − TΔSmθ, which demonstrates that the micellization process is spontaneous and entropy-driven in the temperature range investigated. Furthermore, influence of four organic electrolytes, viz. tetraalkylammonium bromides ((CH3)4NBr, (C2H5)4NBr, (C3H7)4NBr, and (C4H9)4NBr), on the aggregation behavior of [C4mim][C12H25SO3] in aqueous solution was studied. The results show that all the electrolytes investigated promote aggregates formation of [C4mim][C12H25SO3]. In addition, to comprehend the discrepancy in the surface activity of alkylsulfate- and alkylsulfonate-based SAILs, theoretical calculations were performed to evaluate the electrostatic potential of the corresponding anion. Compared to [C4mim][C12H25SO4], the inferior surface activity of [C4mim][C12H25SO3] mainly originates from the less electronegativity of its anion. This work illustrates the self-assembly of the environmentally friendly alkylsulfonate-based SAILs and is expected to be useful in the applications of ionic liquids.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Liquids - Volume 212, December 2015, Pages 23-29
نویسندگان
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