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Linear Viscoelastic Behavior of Multiphase Dispersions.

Pal1

  • 1Department of Chemical Engineering, University of Waterloo, Waterloo, Ontario, N2L 3G1, Canada

Journal of Colloid and Interface Science
|November 10, 2000
PubMed
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The study investigates polymer-thickened emulsions and suspensions, finding their viscoelastic properties vary with concentration. Blends show unique synergy, with deviations from theoretical models at higher concentrations.

Area of Science:

  • Materials Science
  • Rheology
  • Colloid Science

Background:

  • Understanding the viscoelastic behavior of complex fluids like emulsions and suspensions is crucial for various industrial applications.
  • Polymer-thickened systems present unique rheological challenges due to interactions between the dispersed phase, continuous phase, and thickening polymers.

Purpose of the Study:

  • To investigate the linear viscoelastic behavior of polymer-thickened oil-in-water emulsions, solids-in-liquid suspensions, and their blends.
  • To evaluate the applicability of the Palierne theoretical model to these systems across different concentrations.
  • To explore synergistic effects in blends of emulsions and suspensions.

Main Methods:

  • Utilized a controlled-stress rheometer to measure the linear viscoelastic properties (storage modulus G' and loss modulus G") of the materials.

Related Experiment Videos

  • Systematically varied the concentrations of oil in emulsions and solids in suspensions.
  • Investigated blends of emulsions and suspensions at various compositions and frequencies.

    • Main Results:

    • Emulsions transition from viscous to elastic behavior with increasing oil concentration, with the Palierne model accurate only at low concentrations.
    • Suspensions are predominantly viscous, with the Palierne model showing good agreement at low solids concentrations but underpredicting at higher concentrations.
    • Blends exhibit significant synergistic effects at low to moderate frequencies, showing a minimum in blend modulus versus emulsion content, while high-frequency behavior falls between pure components.

    Conclusions:

    • The Palierne model has limited applicability for polymer-thickened emulsions and suspensions at high volume fractions.
    • Concentration significantly impacts the viscoelastic response of both emulsions and suspensions.
    • Blends of emulsions and suspensions display complex rheological behavior, including synergy, which can be correlated using a modulus ratio approach.