Viscosity and dielectric properties of liquid binary mixtures

Mazurkiewicz, Józef; Tomasik, Piotr

doi:10.1002/poc.610030803

Cited by 57 publications

(36 citation statements)

References 10 publications

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“…cm -3 Table 1 4, Excess molar volumes were calculated from our data to compare them with the results of Handa and Benson. The viscosities of the AN-water system also show satisfying agreement with those given by Cunningham, Vidulich and Kay [20], D'Aprano and Fuoss [21] and more recent data of Franco and Costa [22] as well as Mazurkiewicz and Tomasik [23]. 4 and 5.…”

Section: Resultssupporting

confidence: 87%

Precise viscosity measurements of binary liquid mixtures of acetonitrile‐water and 1,3‐dimethyl‐2‐imidazolidinone‐water

Wode

Seidel

1994

Ber Bunsenges Phys Chem

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Viscosities of binary aqueous mixtures of Acetonitrile (AN) and 1,3-Dimethyl-2-imidazolidinone (Dimethylethyleneurea, DMEU) have been measured at atmospheric pressure and temperatures of 20, 25, 30, 35 and 40°C over the entire concentration region by means of Ubbelohde capillary viscometers, type Oc. For a set of 6 viscometers kinetic energy correction functions (Hagenbach-Couette correction) have been experimentally determined for each viscometer using tridistilled water and commercially available liquids. Further corrections accounted for buoyancy and surface tension. Viscosity measurements were carried out with at least three, usually 5 to 6 viscometers, giving viscosities with an estimated uncertainy of 0.3%. Hydrodynamic volumes were determined from relative viscosity vs. concentration curves by means of the viscosity-B-coefficient and compared to van der Waals volumes calculated using increments for functional groups from the literature. Our data indicate the formation of associated species of DMEU and water. Ber. Bunsenges. Phys. Chem. 98, 927-934 (1994) No. 7 0 VCH Verlagsgesellschaft mbH, 0-69451 Weinheim, 1994 wo5-9021/94/0707-0927 $ 10.00+.25/0

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Section: Resultssupporting

confidence: 87%

Precise viscosity measurements of binary liquid mixtures of acetonitrile‐water and 1,3‐dimethyl‐2‐imidazolidinone‐water

Wode

Seidel

1994

Ber Bunsenges Phys Chem

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“…We verified that the plot of A 1 vs the reciprocal of the solvent viscosity 1/g [34] describes a linear curve defined by the following equation, with g in cP:…”

Section: Conductimetrymentioning

confidence: 98%

“…DMSO is a polar solvent completely miscible with water, and water-DMSO mixtures have been studied extensively, from experimental point of view (e.g., dielectric constants, viscosity, surface tension, partial molar volumes, densities, heat capacities, etc.) and theoretically [27][28][29][30][31][32][33][34]. The molar fraction of DMSO, x DMSO = 0.33, was found to be a threshold for many properties such as viscosity, excess enthalpy of mixing, and the chemical shift of protons [31], due to the formation of the complex containing 1DMSO:2H 2 O [30].…”

Section: Introductionmentioning

confidence: 97%

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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“…Examples of such non-ideal behavior in the binary mixture of water and amphiphilic solutes are varied and well-studied [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. Sometimes the anomaly is strongest at surprisingly low solute concentrations.…”

Section: Introductionmentioning

confidence: 99%

Fluctuating micro-heterogeneity in water–tert-butyl alcohol mixtures and lambda-type divergence of the mean cluster size with phase transition-like multiple anomalies

Banerjee

Furtado

Bagchi

2014

The Journal of Chemical Physics

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Water-tert-butyl alcohol (TBA) binary mixture exhibits a large number of thermodynamic and dynamic anomalies. These anomalies are observed at surprisingly low TBA mole fraction, with xTBA ≈ 0.03 − 0.07. We demonstrate here that the origin of the anomalies lies in the local structural changes that occur due to self-aggregation of TBA molecules. We observe a percolation transition of the TBA molecules at xTBA ≈ 0.05. We note that "islands" of TBA clusters form even below this mole fraction, while a large spanning cluster emerges above that mole fraction. At this percolation threshold, we observe a lambda-type divergence in the fluctuation of the size of the largest TBA cluster, reminiscent of a critical point. Alongside, the structure of water is also perturbed, albeit weakly, by the aggregation of TBA molecules. There is a monotonic decrease in the tetrahedral order parameter of water, while the dipole moment correlation shows a weak non-linearity. Interestingly, water molecules themselves exhibit a reverse percolation transition at higher TBA concentration, xTBA ≈ 0.45, where large spanning water clusters now break-up into small clusters. This is accompanied by significant divergence of the fluctuations in the size of largest water cluster. This second transition gives rise to another set of anomalies around. Both the percolation transitions can be regarded as manifestations of Janus effect at small molecular level.

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Viscosity and dielectric properties of liquid binary mixtures

Abstract: The stoichiometry of solvates formed in some binary solvent systems is presented and types of interactions in such systems are discussed based on changes in viscosity and dielectric properties.

Cited by 57 publications

References 10 publications

Precise viscosity measurements of binary liquid mixtures of acetonitrile‐water and 1,3‐dimethyl‐2‐imidazolidinone‐water

Precise viscosity measurements of binary liquid mixtures of acetonitrile‐water and 1,3‐dimethyl‐2‐imidazolidinone‐water

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

Fluctuating micro-heterogeneity in water–tert-butyl alcohol mixtures and lambda-type divergence of the mean cluster size with phase transition-like multiple anomalies

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