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- W2018785562 abstract "The destabilization of hydrated colloidal latex particles in an aqueous electrolyte solution was found to produce aggregates of unusual mass frequencies. Analysis of the mass frequency curves revealed the presence of at least three aggregate populations growing at different rates and allowed determination of the variation with time of the number and weight average masses of these populations and their relative concentrations within the suspension. The fragmentation of aggregates of large mass was induced by decreasing the ionic strength of the suspending medium at constant pH. This instantaneous fragmentation and the subsequent slow breakup of the resulting fragments were investigated by following the variation with time of the suspension characteristics. The aggregation mechanism presented the features of a reversible diffusion-limited process. On the other hand, since electrical interactions were of short range in the concentrated electrolyte medium and hydration forces could be considered to oppose attractive forces, it was possible to attribute the formation of three aggregate populations at least in part to the unusually low energy of the attractive forces involved in aggregate formation. Model structures were designed for each population: aggregates containing only linear interparticle bonds were assigned to population 1, aggregates containing double or triple interparticle contact points to population 2, and aggregates containing multiple contact points or circular links to population 3. Thus, the combined effects of internal stability and collision efficiency, both dependent on aggregate structure, could be assumed to be responsible for the well-differentiated growth of three distinct populations. The preservation of these populations during fragmentation was attributed to their different internal stabilities. In fact, the structure of large aggregates appeared to be very complex since their fragments could be ranked among different populations. Finally, the absence of self-similarity of the mass frequencies determined at different times led us to suppose that the aggregation mechanism would escape analysis on the basis of the mean field approach using Smoluchowski's equation with the usual form of the kernel." @default.
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- W2018785562 date "1998-07-01" @default.
- W2018785562 modified "2023-09-27" @default.
- W2018785562 title "Quantitative Description of Nonhomogeneous Mass Distribution in Controlled Aggregation and Fragmentation of Hydrated Colloids" @default.
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- W2018785562 doi "https://doi.org/10.1006/jcis.1998.5544" @default.
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