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Distribution kinetics theory of Ostwald ripening

Madras, Giridhar and McCoy, Benjamin J (2001) Distribution kinetics theory of Ostwald ripening. In: Journal of Chemical Physics, 115 (14). pp. 6699-706.


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Ostwald ripening occurs near equilibrium conditions when larger clusters grow at the expense of dissolving smaller clusters. We propose that ripening kinetics for growth and dissolution can be represented by a general population balance equation (PBE) for the cluster size distribution (CSD). This PBE can also describe cluster growth or dissolution in the absence of ripening. The Kelvin equation provides the effect of interfacial energy on solubility in terms of the cluster radius. The continuity equation conventionally applied to ripening or cluster growth is obtained as a Taylor series expansion of the governing PBE. Numerical and moment solutions of the PBE show the evolution of the CSD. The cluster number density declines, and the average cluster mass increases. The variance can initially increase as the CSD broadens by growth of large clusters, and then decrease until eventually vanishing. The final state after a long time is a single large cluster in equilibrium with the fluid solution.

Item Type: Journal Article
Publication: Journal of Chemical Physics
Publisher: American Institute of Physics (AIP)
Additional Information: The DOI is currently only displayed. Copyright for this article belongs to American Institute of Physics (AIP)
Keywords: Ostwald ripening;population balance equation (PBE);cluster size distribution (CSD)
Department/Centre: Division of Mechanical Sciences > Chemical Engineering
Date Deposited: 22 Aug 2008
Last Modified: 19 Sep 2010 04:12
URI: http://eprints.iisc.ac.in/id/eprint/246

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