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Phys Chem Chem Phys

Title:		Ionic liquids as modulators of physicochemical properties and nanostructures of sodium dodecyl sulfate in aqueous solutions and potential application in pesticide microemulsions
Author(s):		Li J; Fan T; Xu Y; Wu X;
Address:		"College of Science, China Agricultural University, Beijing 100193, China. wuxuemin@cau.edu.cn. College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China"
Journal Title:		Phys Chem Chem Phys
Year:		2016
Volume:		18
Issue:		43
Page Number:		29797 - 29807
DOI:		10.1039/c6cp04722j
ISSN/ISBN:		1463-9084 (Electronic) 1463-9076 (Linking)
Abstract:		"Emulsifiers for pesticide microemulsions contain a part of volatile organic compounds (VOCs), and ionic liquids (ILs) are becoming potential substitutes. In order to apply ILs in pesticide microemulsions, the study of interaction between ILs and surfactants is necessary. Therefore, the surface properties and aggregation of anionic surfactant sodium dodecyl sulfate (SDS) in ILs, including N-hexyl-N-methylmorpholinyl bromide ([C(6)mm][Br]), N-hexyl-N-methylpiperidyl bromide ([C(6)mp][Br]), N-hexyl-N-methylpyrrolidyl bromide ([C(6)mpyr][Br]), N-octyl-N-methylpyrrolidyl bromide ([C(8)mpyr][Br]), N-dodecyl-N-methylpyrrolidyl bromide ([C(12)mpyr][Br]) and N-hexadecyl-N-methylpyrrolidyl bromide ([C(16)mpyr][Br]), were investigated in terms of surface tension, conductivity, dynamic light scattering (DLS), viscosity, fluorescence, pseudo-ternary phase diagram and (1)H NMR measurements. Generally in agreement, the methods afforded the evaluation of various micellar parameters such as critical micelle concentration (CMC), degree of counterion ionization (alpha), the maximum surface excess concentration (Gamma(max)), the minimum area per surfactant headgroup (A(min)) as well as some thermodynamic parameters, including standard free energy of micellization (DeltaG), standard enthalpy of micellization (DeltaH) and standard entropy of micellization (DeltaS). The results indicated a hydrophobic effect as the primary force of a spontaneous, exothermic, entropy driven micellization process. (1)H NMR technique was applied to reveal the solubilization site and interaction of ILs in aqueous SDS micellar solutions. Fluorescence, DLS and viscosity measurements revealed considerable micellar morphologies and various phase behaviors. Furthermore, the 10% difenoconazole microemulsion was successfully prepared and showed good stability and spreadability in mixtures which indicated ILs' potential application in pesticide formulation"
Keywords:
Notes:		"PubMed-not-MEDLINELi, Jing Fan, Tengfei Xu, Yong Wu, Xuemin eng England 2016/11/03 Phys Chem Chem Phys. 2016 Nov 2; 18(43):29797-29807. doi: 10.1039/c6cp04722j"