Limiting Partial Molar Volumes of Tetra-<i>n</i>-alkylammonium Bromides in Dimethyl Sulfoxide + Water Mixtures at 298.15 K

García-Pañeda, Eugenio; Yanes, Cayetano; Miguel, and Ernestina Muñoz de; Maestre, Alfredo

doi:10.1021/je960130g

Cited by 6 publications

(3 citation statements)

References 5 publications

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“…For DTABr, these two contributions can be evaluated from volume data for tetraalkylammonium bromides (R 4 NBr, with R = methyl [Me], n-butyl [Bu], n-pentyl [Pen]) in DMSO-water solvents [46,60]. The partial molar volumes of DTABr can be calculated, assuming the additivity of the volumes of each chemical group, using the following equations: where V 1 R is the partial molar volume at infinite dilution of R 4 NBr;…”

Section: Solvation Of the Free Monomermentioning

confidence: 99%

Micellization of dodecyltrimethylammonium bromide in water–dimethylsulfoxide mixtures: A multi-length scale approach in a model system

Peyre¹,

Bouguerra²,

Testard³

2013

Journal of Colloid and Interface Science

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The micellization in mixed solvent was studied using conductimetry, density measurements (molar volumes), and small angle neutron scattering (SANS) to explore dodecyltrimethylammonium bromide (DTABr) micelle formation throughout the entire composition range of water-dimethylsulfoxide (DMSO) mixtures. As the concentration of DMSO was increased in the mixture, the critical micelle concentration (CMC) increased, the aggregation number decreased and the ionization degree increased, until no aggregates could be detected any more for DMSO molar fraction higher than 0.51. The results were consistent with the presence of globular micelles interacting via a coulombic potential. The experimental CMC values and aggregation numbers were successfully reconciled with a molecular thermodynamic model describing the micellization process in solvent mixtures (R. Nagarajan and C.-C. Wang, Langmuir 16 (2000) 5242). The structural and thermodynamic characterization of the micelles agreed with the prediction of a dissymmetric solvation of the surfactant entity: the hydrocarbon chain was surrounded only by DMSO while the polar head was surrounded only by water. The decrease in the ionization degree was due to the condensation of the counterions and was definitely linked to the geometrical characteristics of the aggregates and by no means to the CMC or salinity. This multi-technique study provides new insight into the role of solvation in micellization and the reason for the decrease in ionization degree, emphasizing the dissymmetric solvation of the chain by DMSO and the head by water. This is the first time that, for a given surfactant in solvent mixtures, micellization is described using combined analysis from molecular to macroscopic scale.

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Section: Solvation Of the Free Monomermentioning

confidence: 99%

Micellization of dodecyltrimethylammonium bromide in water–dimethylsulfoxide mixtures: A multi-length scale approach in a model system

Peyre¹,

Bouguerra²,

Testard³

2013

Journal of Colloid and Interface Science

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“…In this work, we report not only the liquid phase static relative permittivities of water + dimethyl sulfoxide over the entire mole-fraction range under pressures up to 300 MPa at 298.15 K but also the newly-determined static relative permittivities for water + acetone under the same conditions. In addition, we correlate r values with pressure P by use of the Tait-type equation and we evaluate (∂ ln r /∂P) T and r -2 (∂ r /∂P) T values at 0.1 MPa, which are important for analyzing the thermodynamic properties of electrolyte solutions; some limiting partial molar volumes of electrolytes in water + acetone mixtures (Kawaizumi et al, 1988) and in water + dimethyl sulfoxide mixtures (Garcia-Paneda et al, 1996) have been reported.…”

Section: Introductionmentioning

confidence: 99%

Static Relative Permittivities of Water + Acetone and Water + Dimethyl Sulfoxide under Pressures up to 300 MPa at 298.15 K

1997

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Liquid phase static relative permittivities εr of water + acetone and water + dimethyl sulfoxide have been measured over the whole mole-fraction range under pressures up to 300 MPa at 298.15 K. The pressure P dependence of εr values for each mixture was well fitted to the Tait-type equation, and the Tait-type parameters, A and B, were determined. For each aqueous mixture, the composition dependence of (∂ ln εr/∂P) T values at 0.1 MPa evaluated from the static relative permittivity at 0.1 MPa, εr(0.1), and the Tait-type parameters was compared with that of the isothermal compressibility κ T at 0.1 MPa. Values of εr -2(∂εr/∂P) T at 0.1 MPa as a function of composition were also compared for both aqueous mixtures. For pure acetone, (∂ ln εr/∂P) T and εr -2(∂εr/∂P) T values at 0.1 MPa were correlated with temperature by a combination of the present values and the ones evaluated from the literature εr data.

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“…The experimental results exhibit linearity for both eqs 2 and 3 through a large range of molalities, which is consistent with previous studies of symmetrical quaternary ammonium salts in both aqueous and nonaqueous solvents. 2,[8][9][10]21,[24][25][26] The slopes B v and B v ′ agree for each solvent to within experimental error.…”

Section: Discussionmentioning

confidence: 98%

Partial Molar Volumes of Butyltriethylammonium Iodide in Single Nonaqueous Solvents at 298.15 K

et al. 2009

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Densities of butyltriethylammonium iodide solutions in methanol, 2-propanone, acetonitrile, and nitrobenzene were measured at 298.15 K. Using published values for the Debye-Hu ¨ckel limiting slopes A V , apparent molar volume data were fitted to the Redlich-Rosenfeld-Meyer and the Pitzer equations, allowing the evaluation of partial molar volumes at infinite dilution V j 0 and deviation parameters B V . The results show a similarity between the V j 0 values for the "asymmetrical" quaternary ammonium salt (where the cation has a slightly extended alkyl group) and those for the corresponding "symmetrical" salt (presenting the four alkyl groups identical to the longest of them). Parameter B V is shown to be solvent dependent.

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Limiting Partial Molar Volumes of Tetra-n-alkylammonium Bromides in Dimethyl Sulfoxide + Water Mixtures at 298.15 K

Cited by 6 publications

References 5 publications

Micellization of dodecyltrimethylammonium bromide in water–dimethylsulfoxide mixtures: A multi-length scale approach in a model system

Micellization of dodecyltrimethylammonium bromide in water–dimethylsulfoxide mixtures: A multi-length scale approach in a model system

Static Relative Permittivities of Water + Acetone and Water + Dimethyl Sulfoxide under Pressures up to 300 MPa at 298.15 K

Partial Molar Volumes of Butyltriethylammonium Iodide in Single Nonaqueous Solvents at 298.15 K

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