Advertisement

Charged o/w microemulsion droplets

  • M. Gradzielski
  • H. Hoffmann
Conference paper
Part of the Progress in Colloid & Polymer Science book series (PROGCOLLOID, volume 93)

Abstract

Structure and properties of charged oil-in-water (o/w) microemulsions have been investigated. A particular system made up from a zwitterionic surfactant and hydrocarbon which becomes charged upon the addition of either cationic or anionic surfactant has been studied. A particular feature of this microemulsion system is that the charge density on the droplets can be fixed at a desired value in an easily controllable fashion. These systems have been characterized by means of light scattering, SANS, interfacial tension measurements, electric conductivity and viscosity measurements. The experiments showed that the aggregates remain constant in size over a large concentration region, i.e., from 0.1 to 30 wt%. Moreover, their size is not much changed by the addition of the ionic surfactant. The interactions in this microemulsion system could be described by a hard sphere interaction with an additional DLVO — potential term that accounts for the electrostatic repulsion.

Key words

O/W microemulsions electrostatic interactions light scattering surfactant mixtures 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    Hoar TP, Schulman JH (1943) Nature 152:102CrossRefGoogle Scholar
  2. 2.
    Prince LM (ed) (1977) Microemulsions, theory and practice, Academic Press Inc., New York, San Francisco, LondonGoogle Scholar
  3. 3.
    Robb IE (ed) (1982) Microemulsions, Plenum Press, New YorkGoogle Scholar
  4. 4.
    Gillberg G (1984) In: Lissant KJ (ed) Emulsions and Emulsion Technology, Surfactant Science Series 6, Marcel Dekker, New York, pp 1–43Google Scholar
  5. 5.
    Shah DO (ed) (1981) Surface Phenomena in Enhanced Oil Recovery, Plenum Press, New YorkGoogle Scholar
  6. 6.
    Tadros TF (1984) In: Mittal KL, Lindman B (eds) Surfactants in Solution vol. 3, Plenum Press, New YorkGoogle Scholar
  7. 7.
    Miller CA, Mukherjee S, Benton WJ, Natoli J, Qutubuddin S, Fort Jr T (1982) AlChE Symp Ser 78:28Google Scholar
  8. 8.
    Oetter G, Hoffmann H (1989) J Dispers Sci Technol 9:459CrossRefGoogle Scholar
  9. 9.
    Pößnecker G (1991) Dissertation, Universität BayreuthGoogle Scholar
  10. 10.
    Imae T, Ikeda S (1984) J Colloid Interface Sci 98:363Google Scholar
  11. 11.
    Hoffmann H, Oetter G, Schwandner B (1987) Prog Colloid Polym Sci 73:95CrossRefGoogle Scholar
  12. 12.
    Hoffmann H, Rauscher A, Gradzielski M, Schulz SF (1992) Langmuir 8:2140CrossRefGoogle Scholar
  13. 13.
    Oetter G, Hoffmann H (1989) Coll Surf 38:225CrossRefGoogle Scholar
  14. 14.
    Carnahan NF, Starling KE (1969) J Chem Phys 51:635CrossRefGoogle Scholar
  15. 15.
    Walther KL, Gradzielski M, Hoffmann H, Wokaun A, Fleischer G (1992) J Colloid Interface Sci 153:272CrossRefGoogle Scholar
  16. 16.
    Gradzielski M, Hoffmann H, Oetter G (1990) Colloid Polym Sci 268:167CrossRefGoogle Scholar
  17. 17.
    Schulz GV (1939) Z Phys Chem B43:25Google Scholar
  18. 18.
    Skov Pedersen J, Posselt D, Mortensen K (1990) J Appl Cryst 23:321CrossRefGoogle Scholar
  19. 19.
    Wignall GD, Christen DK, Ramakrishnan V (1988) J Appl Cryst 21:438CrossRefGoogle Scholar
  20. 20.
    Cabane B, Duplessix R, Zemb T (1984) In: Mittal KL, Lindman B (eds) Surfactants in Solution Vol. 1, Plenum Press, New York, pp 373–404Google Scholar
  21. 21.
    Gradzielski M, Hoffmann H (1992) Adv Coll Interface Sci 42:149CrossRefGoogle Scholar
  22. 22.
    Hansen JP, Mc Donald IR (1985) Theory of Simple Liquids, Academic Press, New YorkGoogle Scholar
  23. 23.
    Andersen HC, Chandler D (1970) J Chem Phys 53:547CrossRefGoogle Scholar
  24. 24.
    Verwey EJW, Overbeek JTG (1948) Theory of Stability of Lyophobic Colloids, Elsevier, AmsterdamGoogle Scholar
  25. 25.
    Baba-Ahmed L, Benmouna M, Grimson MJ (1987) Phys Chem Liq 16:235CrossRefGoogle Scholar
  26. 26.
    Gradzielski M (1992) Dissertation, Universität BayreuthGoogle Scholar
  27. 27.
    Rosen MJ, Zhu BY (1984) J Colloid Interface Sci 99:427CrossRefGoogle Scholar
  28. 28.
    Murphy DS, Rosen MJ (1988) J Phys Chem 92:2870CrossRefGoogle Scholar
  29. 29.
    Thomas DG (1965) J Colloid Sci 20:267CrossRefGoogle Scholar

Copyright information

© Dr. Dietrich Steinkopff Verlag GmbH & Co. KG 1993

Authors and Affiliations

  • M. Gradzielski
    • 1
  • H. Hoffmann
    • 1
  1. 1.Physikalische Chemie IUniversität BayreuthBayreuthFRG

Personalised recommendations