Thermodynamics of transfer of hydrogen halides (hydrogen chloride, hydrogen bromide) in glycerol-dimethylformamide mixtures from electromotive force measurements

Rao, D. Muralimohan; Kalidas, C.

doi:10.1021/je00059a003

Cited by 4 publications

(1 citation statement)

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“…The solute surrounds itself preferably by the component in the mixture, which leads to the more negative Gibbs energy of solvation, as expected . The observation that the solvent shell has a composition other than the macroscopic ratio is termed selective or preferential solvation. , Thus, QB seems to detect more GY molecules in its solvent shell than that corresponding to the bulk composition, and probably as a consequence the GY:DMF mixture is not ideal as it was previously demonstrated by other authors. ,,, …”

Section: Resultsmentioning

confidence: 99%

A New Organized Media: Glycerol:N,N-Dimethylformamide Mixtures/AOT/n-Heptane Reversed Micelles. The Effect of Confinement on Preferential Solvation

et al. 2011

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In this work we investigate the behavior of the glycerol (GY):N,N-dimethylformamide (DMF) mixture in homogeneous and sodium 1,4-bis(2-ethylhexyl)sulfosuccinate (AOT)/n-heptane reversed micelles (RMs) media. To achieve this goal we have used the solvatochromic behavior of 1-methyl-8-oxyquinolinium betaine (QB) as an absorption probe, and dynamic light scattering (DLS). QB shows strong preferential solvation when it is dissolved in the GY:DMF mixture, and, as QB is a good hydrogen bond acceptor molecular probe, it is preferentially solvated by the GY-DMF hydrogen-bonded (H-bonded) species. On the other hand, when the GY:DMF mixture was investigated in AOT RMs, the results show that the mixture is encapsulated in the polar core of the AOT RMs. DLS confirms the formation of the GY:DMF/AOT/n-heptane RMs since an increase in the W(s)=([GY]+[DMF])/[AOT] values causes an increment in the RMs droplets sizes. The solvatochromic behavior of QB, which resides at the AOT RMs interface, shows that QB is mostly solvated by GY molecules, especially at low W(s) values. Thus, it seems that upon encapsulation inside the polar core of the AOT RMs, the GY-DMF interaction diminishes due to the strong AOT-GY interaction. (1)H NMR chemical shifts of GY and DMF measured in the different AOT RMs investigated shows that GY and DMF behave practically as noninteracting solvents inside the RMs.

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Section: Resultsmentioning

confidence: 99%

A New Organized Media: Glycerol:N,N-Dimethylformamide Mixtures/AOT/n-Heptane Reversed Micelles. The Effect of Confinement on Preferential Solvation

et al. 2011

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Surface Tension for 1,1,1-Trifluoroethane (R-143a), 1,1,1,2-Tetrafluoroethane (R-134a), 1,1-Dichloro-2,2,3,3,3-pentafluoropropane (R-225ca), and 1,3-Dichloro-1,2,2,3,3-pentafluoropropane (R-225cb)

1997

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Microscopic and Thermodynamic Properties of the HFA134a−Water Interface: Atomistic Computer Simulations and Tensiometry under Pressure

2006

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A combined computational and experimental approach is used to determine the interfacial thermodynamic and structural properties of the liquid 1,1,1,2-tetrafluoroethane (HFA134a)-vapor and liquid HFA134a-water (HFA134a|W) interfaces at 298 K and saturation pressure. Molecular dynamics (MD) computer simulations reveal a stable interface between HFA134a and water. The "10-90" interfacial thickness is comparable with those typically reported for organic-water systems. The interfacial tension of the HFA134a|W interface obtained from the pressure tensor analysis of the MD trajectory is in good agreement with the experimental value determined using in situ high-pressure tensiometry. These results indicate that the potential models utilized are capable of describing the intermolecular interactions between these two fluids. The tension of the HFA134a|W interface is significantly lower than those typically observed for conventional oil-water interfaces and similar to that of the compressed CO(2)-water interface, observed at moderate CO(2) pressures. The MD and tensiometric results are also compared and contrasted with the HFA134a|W and chlorofluorocarbon-water tension values estimated from a parametric relationship. This represents the first report of the interfacial and microscopic properties of the (propellant) hydrofluoroalkanes (HFA)|W interface. The results presented here are of relevance in the design of surfactants capable of forming and stabilizing water-in-HFA microemulsions. Reverse aqueous microemulsions in HFA-based pressurized metered-dose inhalers are candidate formulations for the systemic delivery of biomolecules to and through the lungs.

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Thermodynamics of transfer of hydrogen halides (hydrogen chloride, hydrogen bromide) in glycerol-dimethylformamide mixtures from electromotive force measurements

Cited by 4 publications

References 10 publications

A New Organized Media: Glycerol:N,N-Dimethylformamide Mixtures/AOT/n-Heptane Reversed Micelles. The Effect of Confinement on Preferential Solvation

A New Organized Media: Glycerol:N,N-Dimethylformamide Mixtures/AOT/n-Heptane Reversed Micelles. The Effect of Confinement on Preferential Solvation

Surface Tension for 1,1,1-Trifluoroethane (R-143a), 1,1,1,2-Tetrafluoroethane (R-134a), 1,1-Dichloro-2,2,3,3,3-pentafluoropropane (R-225ca), and 1,3-Dichloro-1,2,2,3,3-pentafluoropropane (R-225cb)

Microscopic and Thermodynamic Properties of the HFA134a−Water Interface: Atomistic Computer Simulations and Tensiometry under Pressure

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