Microheterogeniety in Aqueous Mixtures of Hydrophobic Solutes through Viscosity Studies

Ramanamurti, M. V.; Prabhu, P. V. S. S.; Bahadur, S.

doi:10.1246/bcsj.59.2341

Cited by 24 publications

(12 citation statements)

References 25 publications

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“…This behaviour has been found at each investigated temperature, within the range 273.15 T /K 353.15, where an increase in temperature corresponds to an increase in frequency of the vibrational internal motions for each molecular species and to a consequent decrease in the specific interactions of the complex adducts. In agreement with other authors, (12) we estimate that, for G * E > 0, strong short-range intermolecular interactions, i.e. "structure making" effects, (13) due to hydrogen bonding networks, are operative.…”

Section: Thermodynamics Of Viscous Flowsupporting

confidence: 92%

“…This finding agrees with those of other authors. (12) As far as {ED (1) + DME (2)} is concerned, the harmonic function provides contradictory results. In fact, in this case the corresponding ν E h data are positive, despite the destructuring properties (13) of the DME component towards the ED species as established by thermophysical (4,14,15) and NMR spectroscopic studies.…”

Section: Resultsmentioning

confidence: 99%

“…In line with the results of NMR spectroscopy, (16) we have shown in previous studies (23,24) that the actual aggregated solvent-cosolvent complex in {DME (1) + W (2)} is represented by the 1DME · 2W adduct. The stoichiometric ratio DME : W = 1 : 6 suggests therefore the formation of a supercluster (12,17) of the type {(1DME · 2W) · (4W)}, in which one primary cluster represented by an heteroaggregated complex unit like 1DME · 2W is associated with another homoaggregated primary cluster formed by four water molecules. In other words, the maximum viscosity reached at x 2 ∼ = 0.85 seems to reflect the formation of microheterogeneities and the separation of microphases in these mixed liquid systems; this observation is in perfect agreement with the literature.…”

Section: Resultsmentioning

confidence: 99%

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Viscosity of (ethane-1,2-diol + 1,2-dimethoxyethane + water) at temperatures from 263.15 K to 353.15 K

Cocchi

Manfredini

Marchetti

et al. 2002

The Journal of Chemical Thermodynamics

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Section: Thermodynamics Of Viscous Flowsupporting

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Viscosity of (ethane-1,2-diol + 1,2-dimethoxyethane + water) at temperatures from 263.15 K to 353.15 K

Cocchi

Manfredini

Marchetti

et al. 2002

The Journal of Chemical Thermodynamics

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“…H20-H20, H,O-cosolvent, and cosolvent-cosolvent, would lead to an increase in viscosity and a maximum value when aggregation is maximum, i.e. maximum structuredness (5,30). The viscosity maxima sharpen and the heights of the maxima (as in other systems) increase with decreasing temperature.…”

Section: Resultsmentioning

confidence: 99%

Densities and viscosities of binary aqueous mixtures of nonelectrolytes: tert-Butyl alcohol and tert-butylamine

Kipkemboi¹,

Easteal²

1994

Can. J. Chem.

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PIUS K. KIPKEMBOI, and ALLAN J. EASTEAL. Can. J. Chem. 72, 1937Chem. 72, (1994. The density and shear viscosity of mixtures of tert-butyl alcohol (BuOH) and tert-butylamine (TBA) with water have been determined for various temperatures (288 to 318 K for H20 + BuOH and 288 to 308K for H20 + TBA) over the whole composition range. Excess molar volumes and apparent molar volumes of the components of each system were calculated from the density data. In both systems the apparent molar volume of the organic component passes through a minimum in the water-rich region. Both systems exhibit large negative excess molar volumes which are essentially independent of temperature at all compositions. The two systems show pronounced maxima in their shear viscosity isotherms. Chem. 72, 1937Chem. 72, (1994. On a determint les densites et les viscosites de cisaillement de melanges d'alcool tert-butylique (BuOH) et de tert-butylamine (TBA) avec de I'eau, sur l'ensemble des compositions possibles et B diverses temptratures (allant de 288 K B 318 Kj pour H20 + BuOH et de 288 K B 308 pour H20 + TBA). Utilisant les donnkes de densite, on a calculk les volumes molaires en excbs et les volumes molaires apparents des composants de chaque systkme. Dans les deux systkmes, le volume molaire apparent du composant organique passe par un minimum dans la region riche en eau. Les deux systbmes presentes des volumes molaires en excbs largement negatifs qui sont essentiellement independants de la temperature, B toutes les compositions. Les deux systbmes prtsents des maxima importants dans leurs isothermes de viscosite de cisaillement.[Traduit par la redaction]

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“…Comparisons were also made between the correlation and the densities at 0. [39], with a deviation of −4.94 % for the data of Wallace and Mathews [36], with deviations from −2.9 % to −4.52 % for the data of Muhuri and Hazra [30], and with deviations of −3.75 % and 3.81 % for the data of Burgdorf et al [23]. Kinetic viscosities of 1,2-dimethoxyethane were published by Conesa et al [24] (283.15 K to 333.15 K) and by Cocchi et al [38] (263.15 K to 353.15 K).…”

Section: 2-dimethoxyethanementioning

confidence: 99%

Density and Viscosity Measurements of Dimethoxymethane and 1,2-Dimethoxyethane from 243 K to 373 K up to 20 MPa

Zheng

Meng

et al. 2008

Int J Thermophys

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Measurements of the density and viscosity of dimethoxymethane and 1,2-dimethoxyethane are reported over the temperature range from 243 K to 373 K and at pressures up to 20 MPa. The measurements were performed simultaneously using a vibrating-wire instrument operated in the forced mode of oscillation. The overall uncertainties of these results are 2.0 % in viscosity and 0.2 % in density. The measurements were correlated with a Tait-type equation for density and a hard-sphere model for viscosity. The maximum absolute deviation and the average absolute deviation (AAD) of the density measurements from the correlation for dimethoxymethane are 0.065 % and 0.012 %, respectively, and for 1,2-dimethoxyethane, are 0.16 % and 0.044 %. With regard to viscosity, the maximum absolute deviation and the AAD of the present results from the correlation for dimethoxymethane are 1.55 % and 0.40 %, respectively, and for 1,2-dimethoxyethane, are 1.05 % and 0.26 %. Comparisons of the experimental data and measurements from the literature with values calculated by the correlations at different temperatures and pressures are presented.

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Microheterogeniety in Aqueous Mixtures of Hydrophobic Solutes through Viscosity Studies

Cited by 24 publications

References 25 publications

Viscosity of (ethane-1,2-diol + 1,2-dimethoxyethane + water) at temperatures from 263.15 K to 353.15 K

Viscosity of (ethane-1,2-diol + 1,2-dimethoxyethane + water) at temperatures from 263.15 K to 353.15 K

Densities and viscosities of binary aqueous mixtures of nonelectrolytes: tert-Butyl alcohol and tert-butylamine

Density and Viscosity Measurements of Dimethoxymethane and 1,2-Dimethoxyethane from 243 K to 373 K up to 20 MPa

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