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Interparticle distances in flocs

Authors
Journal
Journal of Colloid and Interface Science
0021-9797
Publisher
Elsevier
Publication Date
Volume
123
Issue
2
Identifiers
DOI: 10.1016/0021-9797(88)90268-8

Abstract

Abstract Silica spheres dispersed in water are flocculated by adding macromolecules that adsorb on their surfaces. The resulting flocs are macroscopic, heterogenous aggregates of spheres between which cohesion is caused by the adsorbed polymer layes, Small-angle neutron scattering is used to measure the distances between spheres in a floc. According to the distribution of these distances, the structures of flocs fall into two classes: (1) aggregates in which the particles are in direct contact—these are tenuous, self-similar structures that resemble those derived from models bases on random collisions; (2) aggregates in which the particles are prevented from coming into direct contact—these structures show a very strong short-range order similar to that observed in a concentrated dispersion of spheres, yet at large scales their organization is dominated by heterogeneities in the density of the floc.

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