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Charges and Dynamics of Colloidal Particles by Quasielastic Light Scattering

  • V. Novotny
  • M. L. Hair

Abstract

Quasielastic light scattering is an attractive method of characterization of charged colloidal particles as it provides simultaneous determination of particle sizes and mobilities. Conventional measurements on nonaqueous colloidal suspensions are difficult, however, because of the nonuniform electric fields. A novel varient of the quasielastic light scattering technique is described in which the electrodes are closely spaced, the particles are moved in an electric field of alternating polarity and the scattered light is analyzed with an autocorrelator. The autocorrelation function of scatterers undergoing periodic motion is described in terms of the diffusion coefficient, the velocity of scatterers and the driving frequency. The method has been tested on 0.11, 0.48, 1.0 and 5.7 μm latexes in water. The surface charge densities of these latexes were found to decrease significantlyasthe particle size increased. A correlation of the surface charge densities with surface densities of ionizable groups determined by x-ray photoelectron spectroscopy and plasma emission spectroscopy was attempted. It is pointed out that this technique also permits the study of the acceleration and deceleration times of charged particles.

Keywords

Autocorrelation Function Colloidal Particle Surface Charge Density Nonuniform Electric Field Aqueous Colloid 
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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Copyright information

© Plenum Press, New York 1980

Authors and Affiliations

  • V. Novotny
    • 1
  • M. L. Hair
    • 1
  1. 1.Xerox Research Centre of Canada LimitedMississaugaCanada

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