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6 - Colloidal attractions and flocculated dispersions

Published online by Cambridge University Press:  05 December 2011

Jan Mewis  and
Norman J. Wagner
Jan Mewis
Affiliation:
Katholieke Universiteit Leuven, Belgium
Norman J. Wagner
Affiliation:
University of Delaware
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Summary

Introduction

In the suspensions discussed in the preceding chapters, the particles did not show a tendency to cluster together as they were colloidally stable. In most real systems this condition is only achieved by taking appropriate measures during formulation as there are always interparticle forces present, in particular dispersion forces, which cause neighboring particles to attract each other. Consequently, many naturally occurring and man-made dispersions are more or less aggregated. Examples include mine tailings, drilling muds, and clay slurries, as well as latex paints, tomato ketchup, and even blood.

Attractive interparticle forces can have a significant effect on the microstructure and on various suspension properties. Therefore, controlling and manipulating the degree of clustering becomes very important in industrial processes such as coating, filtration, dewatering, oil drilling, or the handling of mine tailings. In some cases, e.g., solid-liquid separation, irreversible aggregation provides the best results. In most other applications, one targets a weaker and more reversible flocculation (see Chapter 1 for a definition of these terms) in order to generate an optimal rheological behavior. It is this latter type of system that will be mainly dealt with in the present chapter.

Type
Chapter
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Colloidal Suspension Rheology , pp. 180 - 227
Publisher: Cambridge University Press
Print publication year: 2011

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