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-μm 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.
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机译：大多数有关布朗絮凝的分析都适用于这样的条件，即伦敦范德华力（London-van der Waals）的吸引力导致粒子牢固地束缚在深层的粒子间势阱中。本文报道的结果表明，当颗粒间电势曲线同时反映吸引力和静电排斥力时，初级和次级最小絮凝之间的相互作用。该过程是高度时间依赖性的，因为颗粒从次要絮凝转移至主要絮凝。通过在离子强度范围内悬浮于NaCl水溶液中的0.80μm聚苯乙烯球进行的实验证实了该分析的基本特征。在所有情况下，实验都限于凝结的初始阶段，在凝结初期，单重态和双重态占主导。
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