Colloid and Polymer Science

, Volume 269, Issue 7, pp 704–712 | Cite as

Diffusion in concentrated dispersions: a study with fiber-optic quasi-elastic light scattering (FOQELS)

  • D. Lilge
  • D. Horn
Original Contributions


A fiber-optic, quasi-elastic light-scattering instrument is described using single-mode fiber optical components, including a novel slanted exit face optode. The setup operates with homodyne signal detection. It enables the characterization of diffusion processes in concentrated dispersions up to volume concentrations of 50%.

The performance of the instrument is exemplified with results obtained from latex spheres with diameters of 226 nm and 404 nm at volume fractions from Φ=0.01 to Φ=0.5. The correlation functions are analyzed according to the second order cumulants method and the “Contin”-procedure yielding an average and a distribution function of the short-time self-diffusion coefficient,D eff s , respectively.

At high ionic strength the concentration dependence ofD eff s /D0 is found to be in close agreement with theoretical predictions based on a multi-body interaction model of hard spheres up to Φ=0.45. With decreasing ionic strength the negative slope of the virial expansion tends to increase, presumably due to enhanced repulsive electrostatic interactions.

The described technology offers new experimental means for on-line remote control sensing of particle size in concentrated disperse systems.

Key words

Dynamic light scattering fiber-optics latex dispersions self-diffusion 


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    Pusey PN, Tough RJA (1985) In: Pecora R (ed) Dynamic light scattering. Plenum Press, New York, p 85CrossRefGoogle Scholar
  2. 2.
    Pusey PN, van Mengen W (1983) J Phys (Paris) 44:285CrossRefGoogle Scholar
  3. 3.
    van Veluwen A, Lekkerkerker HNW, de Kruif CG, Vrij A (1987) J Chem Phys 87:4873CrossRefGoogle Scholar
  4. 4.
    Auweter H, Horn D (1985) J Colloid Interface Sci 105:399CrossRefGoogle Scholar
  5. 5.
    Berne BJ, Pecora R (1976) Dynamic light scattering. Wiley, New YorkGoogle Scholar
  6. 6.
    Chu B (1974) Laser light scattering. Academic Press, New YorkGoogle Scholar
  7. 7.
    Oliver CJ (1974) In: Cummins HZ, Pike ER (eds) Photon correlation and light beating spectroscopy. Plenum Press, New York, p 151CrossRefGoogle Scholar
  8. 8.
    Pusey PN, Tough RJA (1982) Adv Colloid Interface Sci 16:143CrossRefGoogle Scholar
  9. 9.
    Pusey PN, Tough RJA (1983) Faraday Discuss Chem Soc 76:123CrossRefGoogle Scholar
  10. 10.
    Wiese H, Horn D (1990) submitted for publicationGoogle Scholar
  11. 11.
    Dickinson E (1984) Annu Rep Prog Chem Sect C 80(C):3Google Scholar
  12. 12.
    Russel WB, Glendinning AB (1981) J Chem Phys 74:948CrossRefGoogle Scholar
  13. 13.
    Batchelor GK (1976) J Fluid Mech 74:1CrossRefGoogle Scholar
  14. 14.
    Felderhof BU (1978) J Phys A 11:929CrossRefGoogle Scholar
  15. 15.
    Beenakker CWJ, Mazur P (1982) Phys Lett A 91:290CrossRefGoogle Scholar
  16. 16.
    Beenakker CWJ, Mazur P (1983) Phys Lett A 98:22CrossRefGoogle Scholar
  17. 17.
    Beenakker CWJ, Mazur P (1984) Physica A 126:349CrossRefGoogle Scholar
  18. 18.
    Thomas JC, Tjin SC (1989) J Colloid Interface Sci 129:15CrossRefGoogle Scholar
  19. 19.
    Ross DA, Dhadwal HS, Dyott RB (1978) J Colloid Interface Sci 64:3CrossRefGoogle Scholar
  20. 20.
    Koppel DE (1972) J Chem Phys 57:4814CrossRefGoogle Scholar
  21. 21.
    Ostrowsky N, Sornette D, Parker P, Pike ER (1981) Optica Acta 28:1059CrossRefGoogle Scholar
  22. 22.
    Licinio P, Delaye M, Livesey AK (1987) J Phys (Paris) 48:1217CrossRefGoogle Scholar
  23. 23.
    Provencher SW (1982) Comput Phys Comm 27:213CrossRefGoogle Scholar
  24. 24.
    van den Broeck C, Lostak F, Lekkerkerker HNW (1981) J Chem Phys 74:2006CrossRefGoogle Scholar
  25. 25.
    Ohtsuki T, Okano K (1982) J Phys Chem 77:1443CrossRefGoogle Scholar
  26. 26.
    Anderson JL, Reed CC (1976) 64:3240Google Scholar
  27. 27.
    Thomas JC (1989) Langmuir 5:1350CrossRefGoogle Scholar

Copyright information

© Steinkopff-Verlag 1991

Authors and Affiliations

  • D. Lilge
    • 1
  • D. Horn
    • 1
  1. 1.Polymer Research Division, Department of Polymer and Solid State Physics, ZKMBASF AGLudwigshafenFRG

Personalised recommendations