Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2007-07-17
Langmuir 24, 26-35 (2008)
Physics
Condensed Matter
Soft Condensed Matter
accepted by Langmuir; 15 pages, w/ 16 figures; 3 supplemental info files included in PDF
Scientific paper
10.1021/la702097g
The phenomenon of burst nucleation in solution, in which a period of apparent chemical inactivity is followed by a sudden and explosive growth of nucleated particles from a solute species, has been given a widely accepted qualitative explanation by LaMer and co-workers. Here, we present a model with the assumptions of instantaneous thermalization below the critical nucleus size and irreversible diffusive growth above the critical size, which for the first time formulates LaMer's explanation of burst nucleation in a manner allowing quantitative calculations. The behavior of the model at large times is derived, with the result that the average cluster size, as measured by the number of atoms, grows linearly with time, while the width of the cluster distribution grows as the square root of time. We develop an effective numerical scheme to integrate the equations of the model and compare the asymptotic expressions to results from numerical simulation. Finally, we discuss the physical effects which cause real nucleation processes in solution to deviate from the behavior of the model.
Privman Vladimir
Robb Daniel T.
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