Spontaneous crystallization of sodium chloride from aqueous-ethanol solutions Part 2: Mechanism of aggregation and coalescence of crystals by Oleg D. Linnikov

Crystal Research and Technology

Cryst. Res. Technol. 41, 138 (2006) - Abstract -

Spontaneous crystallization of sodium chloride from aqueous-ethanol solutions
Part 2: Mechanism of aggregation and coalescence of crystals

Oleg D. Linnikov

Institute of Solid State Chemistry, Ural Branch of the Russian Academy of Sciences, 91 Pervomayskaya St., 620219, Ekaterinburg, Russia

Keywords	sodium chloride, crystallization, coalescence, aggregation of crystals, specific surface energy
PACS	81.10.Dn
DOI	10.1002/crat.200510545

Published data on aggregation kinetics of sodium chloride crystals at its spontaneous crystallization from supersaturated aqueous-ethanol solutions were analysed. It was found that the crystals coalesced through contact nucleus-bridges between them according to the mechanism proposed by Polak. The kinetics of aggregation were described by the Smoluchowski equation for coagulation of colloidal particles. The kinetic coefficient of aggregation process depended on supersaturation, temperature of solution and other characteristics of the system. The specific surface energy of sodium chloride 0.95 mJ/m² was found.

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