Aggregation and micelle formation of ionic liquids in aqueous solution

Miskolczy, Zsombor; Sebők-Nagy, Krisztina; Biczók, László; Göktürk, Sinem

doi:10.1016/j.cplett.2004.10.127

Cited by 291 publications

(220 citation statements)

References 25 publications

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“…For the individual components, CTAB and bmim-octylSO 4 , these values resulted to be 0.9 and 30 mM, respectively, and agree with data reported in literature [34,55,56]. In Fig.…”

Section: Critical Aggregation Concentration (Cac) and Surface Active supporting

confidence: 79%

Catanionic surfactant formation from the interaction of the cationic surfactant hexadecyltrimethylammonium bromide (CTAB) and the ionic liquid 1-butyl-3-methylimidazolium octyl sulfate (bmim-octyl SO4) in aqueous solution

Comelles

Ribosa

González

et al. 2015

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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The interaction between the cationic surfactant Hexadecyltrimethylammonium bromide (CTAB) and the ionic liquid 1-butyl-3-methylimidazolium octyl sulfate (bmim-octylSO 4 ) in aqueous solution has been investigated at two total concentrations (0.5 and 10 mM) and different CTAB mole fractions ( CTAB ).Samples of different physical appearance were obtained depending on  CTAB suggesting different kind of aggregates. Bluish solutions ( CTAB from 0.1 to 0.6) were assigned to vesicles of the catanionic surfactant formed (CTA-octylSO 4 ), whereas clear and isotropic solutions ( CTAB  0.6) corresponded to mixed micelles. Surface tension, electrical conductivity, absorbance and dynamic light scattering (DLS) measurements were performed with the aim of correlating properties changes with the aggregation structures. The critical aggregation concentration (cac) and the surface tension value at the cac ( cac ) were much lower for the mixtures than for the individual components. Thiis finding reveals the 3 exceptional surface activity of these mixtures, attributable to the formation of the CTA-octylSO 4 catanionic surfactant. Once the catanionic surfactant is formed it makes no sense to consider anymore the initial CTAB / bmim-octylSO 4 binary system but a new one composed by CTA-octylSO 4 and the excess of bmimoctylSO 4 or CTAB. On the basis of this consideration the surface activity parameters have been recalculated.

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“…For the individual components, CTAB and bmim-octylSO 4 , these values resulted to be 0.9 and 30 mM, respectively, and agree with data reported in literature [34,55,56]. In Fig.…”

Section: Critical Aggregation Concentration (Cac) and Surface Active supporting

confidence: 79%

Catanionic surfactant formation from the interaction of the cationic surfactant hexadecyltrimethylammonium bromide (CTAB) and the ionic liquid 1-butyl-3-methylimidazolium octyl sulfate (bmim-octyl SO4) in aqueous solution

Comelles

Ribosa

González

et al. 2015

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…As a result, RTILs are widely used in liquid-liquid extraction [24,25], synthesis [26,27], separation [28,29] and electrochemistry [30,31]. Some research groups have also studied the aggregation and micelles formation of ionic liquids in aqueous solution [32]. As RTILs can dissolve many kinds of organic, organometallic and inorganic compounds [33,34], their applications in analytical chemistry have also received attentions recently [35][36][37][38][39].…”

Section: Introductionmentioning

confidence: 99%

Analysis of phthalates via HPLC-UV in environmental water samples after concentration by solid-phase extraction using ionic liquid mixed hemimicelles

Cai

Shi

et al. 2008

Talanta

157

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Ionic liquid mixed hemimicelles-based solid-phase extraction for the preconcentration of five phthalates in environmental water sample was investigated in this paper. A comparative study on the use of room temperature ionic liquids (RTILs) 1-hexyl-3-methylimidazolium bromide ([C 6 mim]Br) and 1-dodecyl-3-methylimidazolium bromide ([C 12 mim]Br)-coated silica as sorbents was presented. Owing to having bigger adsorption amounts for analytes [C 12 mim], Br-coated silica was selected as SPE material and the five analytes di-ethyl-phthalate (DEP), di-n-propyl-phthalate (DnPP), di-n-butyl-phthalate (DnBP), di-cyclohexyl-phthalate (DcHP) and di-(2-ethylhexyl)-phthalate (DEHP) can be quantitatively extracted under optimal conditions. The analytes retained on the cartridge were desorbed completely with 3 mL methanol (pH 2). Predominant factors influencing the extraction efficiency, such as RTILs concentration, pH value, ionic strength and breakthrough volume were discussed. The proposed method had been applied to determining the five phthalates in four environmental water samples and concentration factor of 600 was achieved easily. Detection limits obtained ranged between 0.12 and 0.17 g/L. The accuracy of this method was evaluated by recovery measurement on spiked samples, and good recovery results (85-107%) with relative standard deviation (R.S.D.) of below 6% were achieved.

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“…The critical aggregation concentrations (cac) for the mixtures determined from the three experiments satisfactorily agreed. Aggregation of ILs in imidazolium IL-water mixtures has also been investigated by absorption and fluorescence spectroscopy with Nile Red dye 8 and 1 H NMR chemical shift measurements. 9 Recently, aggregation of BMI + BF4 -in aqueous solutions has been discussed on the basis of the C-H vibration modes for the alkyl groups within imidazolium cation by means of attenuated total reflection infrared and Raman spectroscopy.…”

Section: Introductionmentioning

confidence: 99%

“…[6][7][8][9][10] Based on thermodynamic parameters, such as excess chemical potentials and excess partial molar enthalpies and entropies, aggregations of 1-butyl-3-methlyimidazolium tetrafluoroborate (BMI + BF4 -) and BMI + iodide (BMI + I -) in aqueous solutions have been discussed. 6 This study revealed that the ILs form clusters in the range of IL mole fraction xIL > ~0.…”

Section: Introductionmentioning

confidence: 99%

Aggregation of Imidazolium Ionic Liquids in Molecular Liquids Studied by Small-Angle Neutron Scattering and NMR

et al. 2008

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Aggregation and micelle formation of ionic liquids in aqueous solution

Cited by 291 publications

References 25 publications

Catanionic surfactant formation from the interaction of the cationic surfactant hexadecyltrimethylammonium bromide (CTAB) and the ionic liquid 1-butyl-3-methylimidazolium octyl sulfate (bmim-octyl SO4) in aqueous solution

Catanionic surfactant formation from the interaction of the cationic surfactant hexadecyltrimethylammonium bromide (CTAB) and the ionic liquid 1-butyl-3-methylimidazolium octyl sulfate (bmim-octyl SO4) in aqueous solution

Analysis of phthalates via HPLC-UV in environmental water samples after concentration by solid-phase extraction using ionic liquid mixed hemimicelles

Aggregation of Imidazolium Ionic Liquids in Molecular Liquids Studied by Small-Angle Neutron Scattering and NMR

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