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Cosurfactant facilitated transport in reverse microemulsions

  • Micellar Aggregation
  • Conference paper
  • First Online:
Amphiphiles at Interfaces

Part of the book series: Progress in Colloid & Polymer Science ((PROGCOLLOID,volume 103))

Abstract

Faradaic electron transfer in reverse microemulsions of water, AOT, and toluene is strongly influenced by cosurfactants such as primary amides. Cosurfactant concentration, as a field variable, drives redox electron transfer processes from a low-flux to a high-flux state. Thresholds in this electron-transport phenomenon correlate with percolation thresholds in electrical conductivity in the same microemulsions and are inversely proportional to the interfacial activity of the cosurfactants. The critical exponents derived from the scaling analyses of low-frequency conductivity and dielectric spectra suggest that this percolation is close to static percolation limits, implying that percolative transport is along the extended fractal clusters of swollen micellar droplets. 1H and 13C NMR spectra show that surfactant packing transitions are also driven by changes in cosurfactant concentration. These packing transitions provide a physical basis for these electron transfer and conductivity percolation phenomena. Self-diffusion measurements derived from NMR pulsed gradient spin echo experiments show that water proton diffusion increases at the onset of electrical conductivity percolation and is transported along extended clusters. A dynamic partitioning model provides a direct measure of the volume fraction of these percolating clusters and an order parameter for quantifying water-in-oil droplet to percolating cluster ] microstructural transitions.

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Authors and Affiliations

  1. Eastman Kodak Company, 14650, Rochester, New York, USA

    Dr. J. Texter, B. Antalek, E. García & A. J. Williams

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  1. Dr. J. Texter
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  2. B. Antalek
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  3. E. García
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  4. A. J. Williams
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J. Texter

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© 1997 Steinkopff Verlag

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Texter, J., Antalek, B., García, E., Williams, A.J. (1997). Cosurfactant facilitated transport in reverse microemulsions. In: Texter, J. (eds) Amphiphiles at Interfaces. Progress in Colloid & Polymer Science, vol 103. Steinkopff. https://doi.org/10.1007/3-798-51084-9_19

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  • DOI: https://doi.org/10.1007/3-798-51084-9_19

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  • Publisher Name: Steinkopff

  • Print ISBN: 978-3-7985-1084-5

  • Online ISBN: 978-3-7985-1662-5

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