Schowalter W R, Eidsath A B
Department of Chemical Engineering, University of Illinois, Urbana, IL 61801, USA.
Proc Natl Acad Sci U S A. 2001 Mar 27;98(7):3644-51. doi: 10.1073/pnas.061028498.
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.
大多数对布朗絮凝的分析适用于这样的条件，即伦敦-范德华引力使颗粒在深的颗粒间势阱中强烈结合。本文报道的结果表明，当颗粒间势曲线反映吸引力和静电排斥力时，一次极小值絮凝和二次极小值絮凝之间的相互作用。由于颗粒从二次极小值絮凝转移到一次极小值絮凝，该过程高度依赖时间。在一系列离子强度下，用悬浮在NaCl水溶液中的0.80微米聚苯乙烯球进行的实验证实了分析的基本特征。在所有情况下，实验都局限于凝聚的初始阶段，此时单颗粒和双颗粒占主导。
