Brownian flocculation of polymer colloids in the presence of a secondary minimum.
basic_science · Level V
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- Record sourced from PubMed, PMID 11274382.
- Also identified by PMC identifier 31105.
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Abstract
Most analyses of Brownian flocculation apply to conditions where London-van der Waals attractive forces cause particles to be strongly bound in a deep interparticle potential well. In this paper, results are reported that show the interaction between primary- and secondary-minimum flocculation when the interparticle potential curve reflects both attractive and electrostatic repulsive forces. The process is highly time-dependent because of transfer of particles from secondary- to primary-minimum flocculation. Essential features of the analysis are corroborated by experiments with 0.80-microm polystyrene spheres suspended in aqueous solutions of NaCl over a range of ionic strengths. In all cases, experiments were restricted to the initial stage of coagulation, where singlets and doublets predominate.