title: Reversed micelle formation in a model liquid-liquid extraction system.
abstract: The formation of reversed micelles and the roles of extractant and extracted complexes were investigated in the Cyanex923/n-heptane/H(2)SO(4) system. Interfacial tension (gamma), electrical conductivity (kappa), and water content measurements showed that Cyanex923 had a tendency to self-assemble, forming reversed micelles. The changes in electrical conductivity with concentration of H(2)SO(4) in the organic phase (C(H2)SO(4), o) exhibited an S-type curve: a correlation was found between the change in electrical conductivity and the water content as a function of C(H2)SO(4), o. The changes of electrical conductivity were mainly induced by the components and microstructure in the organic phase, while the conversion of extracted complex also resulted in the changes of components and microstructure in the organic phase. Fourier transform infrared (FTIR) spectroscopy and dynamic light scattering (DLS) were used to characterize the organic phases and sizes of the reversed micelles, respectively. The extractant and extracted complexes, such as Cyanex923H(2)SO(4), were involved in the formation of reversed micelles.
authors.affiliation: Key Laboratory of Rare Earth on Advanced Materials and Valuable Utilization of Resources, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China.
authors.forename: Fuqiang
authors.initials: F
authors.lastname: Guo
authors.forename: Hongfei
authors.initials: H
authors.lastname: Li
authors.forename: Zhifeng
authors.initials: Z
authors.lastname: Zhang
authors.forename: Shulan
authors.initials: S
authors.lastname: Meng
authors.forename: Deqian
authors.initials: D
authors.lastname: Li
mesh_terms: D000327:Adsorption; D004553:Electric Conductivity; D004655:Emulsions; D006536:Heptanes; D008823:Micelles; D008956:Models, Chemical; D053758:Nanoparticles / Q000737:chemistry*; D036103:Nanotechnology / Q000379:methods*; D009946:Organothiophosphorus Compounds; D010721:Phosphinic Acids; D012997:Solvents; D017550:Spectroscopy, Fourier Transform Infrared; D013464:Sulfuric Acids; D013500:Surface Tension; D013501:Surface-Active Agents
chemical_list: D004655:Emulsions; D006536:Heptanes; D008823:Micelles; D009946:Organothiophosphorus Compounds; D010721:Phosphinic Acids; D012997:Solvents; D013464:Sulfuric Acids; D013501:Surface-Active Agents; C028618:n-heptane; C033158:sulfuric acid