Stimulated aggregation in ensembles of microcrystalsстатья

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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.

Работа с статьей

[1] Stimulated aggregation in ensembles of microcrystals / I. V. Melikhov, S. S. Berdonosov, I. V. Znamenskaya et al. // Russian Journal of Physical Chemistry A. — 2008. — Vol. 82, no. 13. — P. 2227–2232. Aggregates of calcium carbonate microcrystals precipitated from a highly supersaturated aqueous solution were found to form in two stages. At the first stage, high-porosity disordered aggregates (floccules), and at the second, low-porosity ordered aggregates (agglomerates) formed. The application of an acoustic field with a frequency of 2.64 MHz and radiation power 3 W/cm 2 did not influence the kinetics of formation of microcrystals but accelerated aggregation by four orders of magnitude. This effect was explained by the sonostimulated desolvation of microcrystals colliding with the surface of aggregates and the corresponding decrease in the probability of the detachment from aggregates after collisions. The formation of microcrystals and aggregates in an acoustic field can be described by a Fokker-Planck-type equation. Taking this into account, a model of sonostimulated agglomeration revealing the direction of further investigations was formulated. В© Pleiades Publishing, Ltd., 2008. [ DOI ]

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