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Related Experiment Videos

Flocculation with poly(ethylene oxide)/tyrosine-rich polypeptide complexes.

Chen Lu1, Robert Pelton

  • 1Department of Chemical Engineering, McMaster University, 307-1710 Main Street West, Hamilton, Ontario L8S 1G6, Canada.

Langmuir : the ACS Journal of Surfaces and Colloids
|April 20, 2005
PubMed
Summary

New research explains how poly(ethylene oxide) (PEO) and cofactor complexes cause aqueous colloid flocculation. These sticky complexes form, adsorb to particles, and bridge them, leading to aggregation.

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Area of Science:

  • Colloid and Surface Science
  • Polymer Chemistry
  • Materials Science

Background:

  • Flocculation is crucial for water treatment and material processing.
  • Understanding the mechanism of polymer-induced flocculation is essential for optimizing these processes.
  • Sequential addition of polymers can lead to complex interactions and aggregation.

Purpose of the Study:

  • To elucidate the mechanism of aqueous colloid flocculation induced by sequential addition of a phenolic polymer cofactor and poly(ethylene oxide) (PEO).
  • To investigate the role of PEO/cofactor complexes in the flocculation process.
  • To understand the factors influencing the 'stickiness' and deactivation of these complexes.

Main Methods:

  • Sequential addition of a polypeptide cofactor (PEY1) and high molecular weight poly(ethylene oxide) (PEO) to aqueous colloidal suspensions.

Related Experiment Videos

  • Flocculation experiments using precipitated calcium carbonate as the model colloid.
  • Independent characterization of PEO/PEY1 complex properties in solution.

    • Main Results:

    • PEO/cofactor complexes form in the aqueous phase and adsorb onto colloidal particle surfaces.
    • Flocculation occurs when these complexes bridge between particles, indicating they are 'sticky'.
    • Complexes deactivate over time due to reconfiguration, losing their binding capability.

    Conclusions:

    • The proposed mechanism of PEO/cofactor complex formation and adsorption explains colloid flocculation.
    • The 'stickiness' of complexes is attributed to the simultaneous presence of unbound cofactor and polymer segments.
    • Complex deactivation via reconfiguration is a key factor in the temporal stability of the flocculation process.