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Time-Dependent Effects Near the Percolation Threshold in Water-in-Oil Microemulsions

  • H.-F. Eicke
  • S. Geiger
  • R. Hilfiker
  • F. A. Sauer
  • H. Thomas
Part of the NATO ASI Series book series (volume 167)

Abstract

The three-component system water/surfactant(AOT)/oil(i-C8) forms in a certain range of compositions and temperatures (see Fig. 1) thermodynamically stable microemulsions consisting of nanometer-sized water droplets (ND) covered by a monomolecular layer of surfactant and dispersed in oil /1/. The nanodroplet radius is controlled by the ratio w0 = [H2O]/[AOT] and has a typical value of 10 nm. The nanodroplets are spherically symmetric and rather monodisperse, as has been established both experimentally and theoretically (see e.g. /2/). The spontaneous formation and thermodynamic stability of these emulsions is due to the “ultra-low” interfacial tension of the order of kBT/4πR2 (R = radius of spherical water droplet) of the oil/water interface in the presence of surfactant(s). This is a consequence — to a first approximation — of a compensation of Coulombic, lateral dispersion and curvature energy contributions.

Keywords

Charge Transport Percolation Threshold Dielectric Response Monomolecular Layer Ohmic Conductivity 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    Eicke, H.F. 1987 in “Interfacial Phenomena in Apolar Media”, H.F. Eicke and G.D. Parfitt, ed. M. Dekker, New YorkGoogle Scholar
  2. 2.
    De Gennes, P.G. and Taupin, C. 1982, J. Phys. Chem. 86: 2294CrossRefGoogle Scholar
  3. 3.
    Mitescu, C.F. and Musolf, M.J. 1983, J. Physique Lett. 44: L-679CrossRefGoogle Scholar
  4. 4.
    Aharony and G. Grest, private communications.Google Scholar
  5. 5.
    Eicke, H.F., Hilfiker, R. and Thomas, H. 1986, Chem. Phys. Lett. 125: 295ADSCrossRefGoogle Scholar
  6. 6.
    Eicke, H.F., Hilfiker, R. and Thomas, H. 1985, Chem. Phys. Lett. 120: 272ADSCrossRefGoogle Scholar
  7. 7.
    Eicke, H.F., Geiger, S., Sauer, F.A. and Thomas, H. 1986, Ber. Bunsen-ges. Phys. Chem. 90: 872Google Scholar
  8. 8.
    Hilfiker, R. and Eicke, H.F. 1987, J.C.S. Faraday Trans. I, in pressGoogle Scholar

Copyright information

© Plenum Press, New York 1987

Authors and Affiliations

  • H.-F. Eicke
    • 1
  • S. Geiger
    • 1
  • R. Hilfiker
    • 1
  • F. A. Sauer
    • 2
  • H. Thomas
    • 3
  1. 1.Institut für Physikalische ChemieUniv. BaselBaselSwitzerland
  2. 2.Max-Planck-Institut für BiophysikFrankfurt/MainGermany
  3. 3.Institut für PhysikUniversität BaselBaselSwitzerland

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