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Compact Fiber Optic Dynamic Light Scattering System

Sadasivan1, Rasmussen

  • 1Center for Advanced Materials Processing, Clarkson University, Potsdam, New York, 13699

Journal of Colloid and Interface Science
|September 15, 1997
PubMed
Summary
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Fiber optic dynamic light scattering (FODLS) measures particle sizes in concentrated dispersions. FODLS can distinguish between collective and self-diffusion, making its apparent diffusion coefficient a useful relative quantity for process industries.

Area of Science:

  • Materials Science
  • Chemical Engineering
  • Optics

Background:

  • Fiber optic dynamic light scattering (FODLS) is an emerging technique for particle sizing.
  • Its application in concentrated dispersions is crucial for process industries.
  • Online particle size measurement is a key industrial requirement.

Purpose of the Study:

  • To investigate the capabilities of FODLS for particle size analysis in concentrated dispersions.
  • To evaluate the influence of particle size, volume fraction, and signal-to-noise ratio on FODLS measurements.
  • To determine whether FODLS probes self-diffusion or collective diffusion based on particle size.

Main Methods:

  • Utilized two different laser light sources for experiments.
  • Studied monodisperse polystyrene latex dispersions with varying particle sizes and volume fractions.

Related Experiment Videos

  • Analyzed apparent diffusion coefficients as a function of experimental parameters.

    • Main Results:

    • Apparent diffusion coefficients were dependent on particle size, volume fraction, and signal-to-noise ratios.
    • FODLS demonstrated the ability to probe collective diffusion for smaller particles and self-diffusion for larger particles.
    • In polydisperse concentrated dispersions, FODLS probed both self and collective diffusion.

    Conclusions:

    • The apparent diffusion coefficient obtained from FODLS in concentrated dispersions is a relative quantity.
    • FODLS is a promising technique for online particle size measurement in industrial processes.
    • Understanding the probed diffusion mode (self vs. collective) is essential for accurate interpretation of FODLS data.