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Photon correlation spectroscopy for analysis of low concentration submicrometer samples

  • A. W. Willemse
  • J. C. M. Marijnissen
  • A. L. van Wuyckhuyse
  • R. Roos
  • H. G. Merkus
  • B. Scarlett
Conference paper
Part of the Progress in Colloid & Polymer Science book series (PROGCOLLOID, volume 104)

Abstract

Photon Correlation Spectroscopy is a technique to rapidly measure particle size in the submicrometer region. The use of PCS is, however, limited by concentration. The upper limit is due to multiple scattering of the incident light, the lower limit is determined by the fact that fluctuations of the number of particles in the measuring zone have a significant influence on the apparent diffusion coefficient. In this article a new signal processing method is described which differentiates this influence. With this system the lower limit is no longer limited to about 100 particles in the measuring volume corresponding to a concentration of 109 particles/cm3. The limitation is now the intensity of the scattered light which becomes too weak at a concentration of about 50 particles/cm3. As a consequence of this work, a revision to the basic theory of PCS may be necessary. Moreover, the new processing method enables also the measurement of particle concentration in the sample.

Key words

Light scattering particle-size analysis photon correlation spectroscopy 

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References

  1. 1.
    Weber R, Rambau R, Schweiger G, Lucas K (1993) Analysis of a flowing aerosol by correlation spectroscopy: Concentration, aperture, velocity and particle size effects. J Aerosol Sci 24:485CrossRefGoogle Scholar
  2. 2.
    Drunen van M (1995) Measurement and modeling of cluster formation, PhD thesis, Delft University of TechnologyGoogle Scholar

Copyright information

© Steinkopff Verlag 1997

Authors and Affiliations

  • A. W. Willemse
    • 1
  • J. C. M. Marijnissen
    • 1
  • A. L. van Wuyckhuyse
    • 1
  • R. Roos
    • 1
  • H. G. Merkus
    • 1
  • B. Scarlett
    • 1
  1. 1.Faculty of Chemical Engineering Particle Technology GroupDelft University of TechnologyBL DelftThe Netherlands

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