title: Kinetic analysis of ion pair extraction of an alkyl sulfate anion across a liquid/liquid interface by fluorescence microspectroscopy and microelectrochemistry of single microdroplets.
abstract: Mass transfer of an alkyl sulfate anion with a (ferrocenylmethyl)trimethylammonium cation from water into single oil microdroplets was kinetically studied by microcapillary injection, fluorescence microspectroscopy, and microelectrochemistry. The partitioning ratio and the extraction rate significantly depended on the alkyl chain length of the alkyl sulfate anion. The extraction rate for the n-dodecyl sulfate or n-tridecyl sulfate ion was proportional to both the alkyl sulfate ion and ferrocene derivative concentrations while that for the n-undecyl sulfate ion was proportional to the anion concentration alone. The results are discussed in terms of transfer of the individual ions across the microdroplet/water interface and adsorption/ion pair formation of the alkyl sulfate ion at the microdroplet/water interface.
authors.affiliation: Department of Chemistry, Graduate School of Pure and Applied Sciences, University of Tsukuba, Ibaraki 305-8571, Japan.
authors.forename: Takayuki
authors.initials: T
authors.lastname: Negishi
authors.forename: Kiyoharu
authors.initials: K
authors.lastname: Nakatani
mesh_terms: D000327:Adsorption; D004563:Electrochemistry / Q000379:methods*; D007700:Kinetics; D012967:Sodium Dodecyl Sulfate / Q000032:analysis*; D013050:Spectrometry, Fluorescence / Q000379:methods*; D013463:Sulfuric Acid Esters / Q000032:analysis*
chemical_list: D013463:Sulfuric Acid Esters; D012967:Sodium Dodecyl Sulfate; C086030:undecyl sulfate; C028913:dodecyl sulfate