Colloid and Polymer Science

, Volume 269, Issue 7, pp 704–712

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

  • D. Lilge
  • D. Horn
Original Contributions

DOI: 10.1007/BF00657408

Cite this article as:
Lilge, D. & Horn, D. Colloid Polym Sci (1991) 269: 704. doi:10.1007/BF00657408


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,Deffs, respectively.

At high ionic strength the concentration dependence ofDeffs/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 scatteringfiber-opticslatexdispersionsself-diffusion

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