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Related Experiment Videos

Sedimentation Field-Flow Fractionation of Nonspherical Particles

Blau1, Zollars

  • 1Department of Chemical Engineering, Washington State University, Pullman, Washington, 99164-2710

Journal of Colloid and Interface Science
|November 10, 1996
PubMed
Summary
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Sedimentation field-flow fractionation (SdFFF) particle size analysis is affected by particle shape. Rod-like particles elute faster than predicted, with retention depending on maximum dimension and tumbling motion.

Area of Science:

  • Analytical Chemistry
  • Materials Science
  • Colloid Science

Background:

  • Sedimentation field-flow fractionation (SdFFF) is a key technique for submicrometer hydrosol particle size analysis.
  • Previous SdFFF studies of coagulated latex showed faster-than-expected elution.
  • This anomaly was attributed to particle shape effects on retention.

Purpose of the Study:

  • To investigate the impact of particle shape on SdFFF retention.
  • To analyze shear-coagulated polystyrene latex particles with uniform rod-like shapes.
  • To determine how particle dimensions and motion influence SdFFF elution behavior.

Main Methods:

  • Preparation of monodisperse polystyrene latices coagulated into rod-like shapes under shear.
  • Analysis of these shaped particles using Sedimentation field-flow fractionation (SdFFF).

Related Experiment Videos

  • Comparison of experimental elution times with theoretical predictions based on particle size and shape.

    • Main Results:

    • SdFFF retention of rod-like particles is governed by their maximum dimension, not average size.
    • Faster elution than predicted was observed for highly retained rod-like particles.
    • Particle tumbling in the shear flow of the SdFFF channel reduces retention time.

    Conclusions:

    • Particle shape significantly influences SdFFF retention behavior, deviating from standard size-based predictions.
    • The maximum dimension of anisotropic particles dictates their retention in SdFFF.
    • Hydrodynamic effects, such as tumbling motion, must be considered for accurate analysis of non-spherical particles.