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Crystal Comets: Dewetting During Emulsion Droplet Crystallization

by: PT Spicer, RW Hartel
Australian Journal of Chemistry, Vol. 58, No. 9. (2005), pp. 655-659.

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Liquid oil emulsion droplets can violently dewet their own solid crystals during crystallization as a result of surfactant adsorption. The crystal shape formed is a function of the relative rates of dewetting and crystallization as controlled by surfactant adsorption, cooling rate, and lipid purity. For negligible dewetting rates, crystals nucleate and grow within the droplet. At similar crystallization and dewetting rates, the droplet is propelled around the continuous phase on a crystalline âcomet tailâ much larger than the original droplet. Rapid dewetting causes the ejection of small discrete crystals across the dropletâs oilâwater interface.


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