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Effect of particle size on stability of monodisperse selenium hydrosols

par Petit, Anne-Marie ;Dumont, Freddy ;Watillon, André
Référence Journal of colloid and interface science, 43, 3, page (649-661)
Publication Publié, 1973-06

Article révisé par les pairs

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Résumé :

Monodisperse spherical selenium hydrosols were prepared in a large range of particle radii. Stability was measured as a function of the particle dimension at a fixed pH. For each particle size, the electrophoretic mobilities were determined in the coagulation concentration domain, and the calculated electrokinetic potentials were found to be radius-independent at the Clim. This set of experimental data was interpreted in terms of the DLVO theory. The interaction energy curves were computed under both conditions of constant potential and constant charge; the correcting term taking into account the viscous interactions was incorporated into the classical Fuchs integral. The calculated Clim/particle size relationship is discussed. In comparing these computations with experimental data, it is shown (1) that the elaborated theories could not explain the size effect on stability, (2) that the coagulation of small particles, occurring in the primary minimum, is well described by using the simple model of a critical barrier height, and (3) that, for large particles, excellent agreement with experiment is obtained when considering a constant secondary minimum. © 1973.