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Related Experiment Videos

Polyelectrolyte-Induced Aggregation of Microcrystalline Cellulose: Reversibility and Shear Effects.

Alfano1, Carter, Dunham

  • 1Nalco Chemical Company, Polymer Science Department, One Nalco Center, Naperville, Illinois, 60563-1198

Journal of Colloid and Interface Science
|March 4, 2000
PubMed
Summary

Polyelectrolyte-induced aggregation of microcrystalline cellulose (MCC) flocs is reversible under specific conditions. Adding colloidal silica enhances reversible aggregation after high-shear degradation, unlike polyelectrolyte alone.

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Area of Science:

  • Materials Science
  • Colloid and Surface Chemistry

Background:

  • Microcrystalline cellulose (MCC) aggregation is influenced by polyelectrolytes.
  • Understanding aggregation reversibility under shear is crucial for industrial processes.

Purpose of the Study:

  • To investigate the reversibility of polyelectrolyte-induced MCC aggregation under high-shear conditions.
  • To correlate focused beam reflectance measurement (FBRM) data with particle size analysis.
  • To model aggregate adhesion forces and interfacial behavior.

Main Methods:

  • Focused Beam Reflectance Measurement (FBRM) in a high-shear zone.
  • Laser diffraction for particle size analysis in a low-shear zone.
  • Atomic Force Microscopy (AFM) for surface force measurements.

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Main Results:

  • MCC flocs formed with cationic polyelectrolyte alone did not reaggregate after high-shear rupture.
  • MCC flocs formed with both polyelectrolyte and colloidal silica reaggregated reversibly after high-shear degradation.
  • Minimum aggregate adhesion forces were calculated to be approximately 3 nN.
  • AFM showed more reversible adhesion forces with colloidal silica compared to polyelectrolyte alone.

Conclusions:

  • Colloidal silica plays a key role in the reversible aggregation of MCC flocs under shear.
  • A descriptive model for MCC aggregation and adhesion behavior at interfaces is proposed.
  • Shear-dependent FBRM is a valuable tool for studying aggregate dynamics and adhesion forces.