Thermodynamics of micellization of imidazolium ionic liquids in aqueous solutions

Łuczak, Justyna; Jungnickel, Christian; Joskowska, Monika; Thöming, Jorg; Hupka, Jan

doi:10.1016/j.jcis.2009.03.017

Cited by 177 publications

(91 citation statements)

References 27 publications

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“…containing salts with water was reported (Ficke and Brennecke 2010) and it was interpreted by ''stronger'' interactions between IL and water as compared with respective IL-IL and water-water ones. Most of literature agrees on the formation of aggregates or micelles of an ionic liquid in water, similar to ionic surfactant behaviour (Jungnickel et al 2008;Luczak et al 2009;Cornellas et al 2011;Wang et al 2008;Wu et al 2010). Hydrogen bonding between some ionic liquids and water were observed experimentally (using NMR and IR) and confirmed with molecular modelling Wu et al 2009).…”

Section: Viscosity Of Emimac-water Mixturessupporting

confidence: 55%

Influence of water on cellulose-EMIMAc solution properties: a viscometric study

Sescousse

Budtova

2011

Cellulose

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International audienceThe influence of water on cellulose dissolved in 1-ethyl-3-methylimidazolium acetate (EMIMAc) is analysed by measuring steady state viscosity of dilute solutions. The goal is to determine: (a) the maximal water content allowing keeping cellulose dissolved (in dilute regime) and (b) the influence of water on solution flow and cellulose hydrodynamic properties. Mixing EMIMAc and water is exothermal and EMIMAc-water viscosity does not obey a logarithmic mixing rule suggesting strong interactions between the components. Newtonian flow of cellulose-EMIMAc-water solutions was recorded at water concentrations below 15 wt% and a shear thinning was observed for higher water content. It was suggested that above 15 wt% water cellulose is not completely dissolved: swollen aggregates form a sort of a "suspension" which is structuring under shear. Cellulose intrinsic viscosity showed a peak at 10 wt% water-90 wt% EMIMAc. It was hypothesised that the addition of water leads to the formation of large cellulose aggregates due to the preferential cellulose-cellulose interaction

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Section: Viscosity Of Emimac-water Mixturessupporting

confidence: 55%

Influence of water on cellulose-EMIMAc solution properties: a viscometric study

Sescousse

Budtova

2011

Cellulose

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“…The negative values of ΔH m 0 suggest the importance of the London-dispersion interactions as an attractive force for micellization whereas positive values mean the release of structured water from the hydration layer around the hydrophobic parts of the molecule. A similar behavior was observed for imidazolium bromide and imidazolium chloride ionic liquids possessing a longer carbon chain length [34,38].…”

Section: Conductometric Properties Of [C N Mim]br (N=10 14)supporting

confidence: 74%

Apparent molar volume, conductivity, and fluorescence studies of ternary systems of dipeptides + ionic liquids ([Cnmim]Br, n = 10, 14) + water at different temperatures

et al. 2015

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Densities, conductivities, and fluorescence spectra of two imidazolium ionic liquids ([C n mim]Br, n=10, 14)-glycyl dipeptide-water mixtures were measured as a function of temperature. The density data have been utilized to calculate the apparent molar volumes, standard partial molar volumes (V 2,φ 0 ), standard partial molar volumes of transfer from water to aqueous ionic liquids solutions (Δ t V°), the hydration number (N H ), partial molar expansibility (E φ 0 ), and Hepler's constant of glycyl dipeptides. Through the electrical conductivity measurements, the c cmc values at different temperatures and a series of thermodynamic parameters (ΔG m o , ΔH m o , and ΔS m o ) of micellization of [C n mim]Br (n=10, 14) in aqueous glycyl dipeptides solutions are evaluated. The pyrene fluorescence spectra were used to study the change of micropolarity produced by the interaction of [C n mim]Br with glycyl dipeptide, and the aggregation behavior of [C n mim]Br (n=10, 14). The results shown above have been explained in terms of solutesolvent interactions and structural changes in the mixed solutions. The interaction between [C n mim]Br (n=10, 14) and glycyl dipeptide is affected by temperature and hydrocarbon chain length of the dipeptides.

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“…This was observed with block copolymers such as pluronic F127 ) and tetronic 304 (Roques et al, 2009). In other cases, the CMC decreases upon increasing the temperature, then, goes through a minimum, and increases at high temperatures (Paula et al, 1995;Beyer et al, 2006;Łuczak et al, 2009). This was observed in the case of ionic surfactants such as sodium oleate (Hildebrand et al, 2004) and sodium dodecyl sulphate (Paula et al, 1995), non-ionic surfactants such as octyl glucoside (Paula et al, 1995) as well as in the case of mixed micelles (Hildebrand et al, 2004).…”

Section: Critical Micelle Concentration (Cmc) and Enthalpy Of Micellimentioning

confidence: 81%

What can isothermal titration microcalorimetry experiments tell us about the self‐organization of surfactants into micelles?

Bouchemal

Agnely

Akpadza

et al. 2010

J of Molecular Recognition

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Thermodynamics of micellization of imidazolium ionic liquids in aqueous solutions

Cited by 177 publications

References 27 publications

Influence of water on cellulose-EMIMAc solution properties: a viscometric study

Influence of water on cellulose-EMIMAc solution properties: a viscometric study

Apparent molar volume, conductivity, and fluorescence studies of ternary systems of dipeptides + ionic liquids ([Cnmim]Br, n = 10, 14) + water at different temperatures

What can isothermal titration microcalorimetry experiments tell us about the self‐organization of surfactants into micelles?

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