Mass transfer and dynamic liquid-liquid interfacial tension. I. Experiment

Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.Downloaded from the University of Groningen/UMCG research database (Pure): http://www.rug.nl/research/portal. For technical reasons the number of authors shown on this cover page is limited to 10 maximum. Titration microcalorimetry is used to study the influences of iodide, bromide, and chloride counterions on the aggregation of vesicle-forming 1-methyl-4-(2-pentylheptyl)pyridinium halide surfactants. Formation of vesicles by these surfactants was characterised using transmission electron microscopy. When the counterion is changed at 303 K through the series iodide, bromide, to chloride, the critical vesicular concentration (cvc) increases and the enthalpy of vesicle formation changes from exo-to endothermic. With increase in temperature to 333 K, vesicle formation becomes strongly exothermic. Increasing the temperature leads to a decrease in enthalpy and entropy of vesicle formation for all three surfactants. However the standard Gibbs energy for vesicle formation is, perhaps surprisingly, largely unaffected by an increase in temperature, as a consequence of a compensating change in both standard entropy and standard enthalpy of vesicle formation. Interestingly, standard isobaric heat capacities of vesicle formation are negative, large in magnitude but not strikingly dependent on the counterion. We conclude that the driving force for vesicle formation can be understood in terms of overlap of the thermally labile hydrophobic hydration shells of the alkyl chains.

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A Titration Microcalorimetric Study of the Effects of Halide Counterions on Vesicle-Forming Aggregation in Aqueous Solution of Branched-Chain Alkylpyridinium Surfactants

Gooijer

Engberts

Blandamer

2000

Journal of Colloid and Interface Science

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Phospholipids at the oil/water interface: adsorption and interfacial phenomena in an electric field

Shchipunov

Kolpakov

1991

Advances in Colloid and Interface Science

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Mass transfer and dynamic liquid—liquid interfacial tension. II. Theory of the relation between change of interfacial tension and change of phase volume with time, in a stirred system

Ostrovsky

Good

1985

Journal of Colloid and Interface Science

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Mass transfer and dynamic liquid-liquid interfacial tension. I. Experiment

Cited by 9 publications

References 6 publications

A Titration Microcalorimetric Study of the Effects of Halide Counterions on Vesicle-Forming Aggregation in Aqueous Solution of Branched-Chain Alkylpyridinium Surfactants

A Titration Microcalorimetric Study of the Effects of Halide Counterions on Vesicle-Forming Aggregation in Aqueous Solution of Branched-Chain Alkylpyridinium Surfactants

Phospholipids at the oil/water interface: adsorption and interfacial phenomena in an electric field

Mass transfer and dynamic liquid—liquid interfacial tension. II. Theory of the relation between change of interfacial tension and change of phase volume with time, in a stirred system

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