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The Structure, Dynamics and Equilibrium Properties of Colloidal Systems pp 253–278Cite as

Droplet Size and Dynamics in Water in Oil Microemulsions. Correlations Between Results from Time-Resolved Fluorescence Quenching, Quasielastic Light Scattering, Electrical Conductivity and Water Solubility Measurements

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Part of the book series: NATO ASI Series ((ASIC,volume 324))

Abstract

The effect of the oil, surfactant and alcohol chain length, of the temperature, and of the alcohol concentration on the water droplet size and interdroplet interaction in water-in-oil (w/o) microemulsions has been investigated by time-resolved fluorescence quenching, quasielastic light scattering, electrical conductivity and water solubility (partial phase behavior). The results obtained with these different methods correlate perfectly well and indicate increases in droplet size and interdroplet attractive interactions as the oil(alkane) chain length and the temperature increase and as the surfactant and alcohol chain length and alcohol concentration decrease, in agreement with the predictions of recent theories of the stability of w/o microemulsions. The rate constant ke associated with the exchange of material between droplets upon collisions with transient merging was found to be at least equal to or larger than (l–2) × 109 M−1s−1 for all of the systems where electrical percolation occurred upon increase of the fraction of disperse phase or temperature. This requirement indicates that above the percolation threshold the high electrical conductivity is due to the motion of counterions through water channels and/or fusion between droplets in droplet clusters, rather than to hopping of surfactant ions between droplets upon droplet collisions. The results also show that from the variation of the electrical conductivity with any of the parameters which characterize the microemulsion one can predict qualitatively the resulting variations of droplet size, interdroplet attractive interactions, and rate of exchange of material between droplets via droplet collisions.

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Authors and Affiliations

  1. Institut Charles Sadron (CRM-EAHP), CNRS-ULP, 6, rue Boussingault, 67083, Strasbourg Cédex, France

    J. Lang, R. Zana & N. Lalem

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  2. R. Zana
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Editors and Affiliations

  1. Department of Chemistry and Applied Chemistry, University of Salford, Salford, UK

    D. M. Bloor  & E. Wyn-Jones  & 

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Lang, J., Zana, R., Lalem, N. (1990). Droplet Size and Dynamics in Water in Oil Microemulsions. Correlations Between Results from Time-Resolved Fluorescence Quenching, Quasielastic Light Scattering, Electrical Conductivity and Water Solubility Measurements. In: Bloor, D.M., Wyn-Jones, E. (eds) The Structure, Dynamics and Equilibrium Properties of Colloidal Systems. NATO ASI Series, vol 324. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-3746-1_18

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  • DOI: https://doi.org/10.1007/978-94-011-3746-1_18

  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-94-010-5666-3

  • Online ISBN: 978-94-011-3746-1

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