Quantitative Description of Nonhomogeneous Mass Distribution in Controlled Aggregation and Fragmentation of Hydrated Colloids

Journal of Colloid and Interface Science
Josiane Widmaier, Emile Pefferkorn

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...Continue Reading

References

Dec 1, 1996·Journal of Colloid and Interface Science·J L Ortega-VinuesaR Hidalgo-Álvarez
Jan 1, 1985·Physical Review. B, Condensed Matter·P MeakinF Family
May 1, 1995·Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics·T NarayananD Beysens
Oct 1, 1995·Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics·F SciortinoP Tartaglia

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Citations

Jun 11, 1999·Journal of Colloid and Interface Science·L OualiE Pefferkorn
Jun 3, 2010·Langmuir : the ACS Journal of Surfaces and Colloids·G FrappierS Skali-Lami

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