The use of phase-inverting emulsions to show the phenomenon of interfacial crystallization on both heating and cooling

Catherine E. Nicholson, Sharon J. Cooper*, Claire Marcellin, Matthew J. Jamieson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

Highly anomalous crystallization behavior has been achieved in phase-inverting emulsion systems by using nonionic surfactants that induce nucleation. In particular, nucleation can be inhibited at the phase inversion, allowing systems held at, or near, this temperature to undergo crystallization either on heating or cooling. This new phenomenon is demonstrated for 27.4 wt % aqueous glycine solutions emulsified in decane using Span 20 Tween 20 blends. The inhibitory effect on interfacial nucleation at/near the phase inversion is readily shown by the maximum in the induction time for crystallization found in systems at/near the phase-inversion temperature. These findings are unprecedented. An extremely rapid rise in nucleation rate is expected on cooling glycine solutions, owing to the associated increase in supersaturation, the driving force for crystallization. The origin of this highly anomalous behavior is thought to be the low droplet interfacial tension, γow, that occurs at the phase-inversion temperature,which results primarily in a substantially increased contact angle between the glycine critical nucleus and the droplet interface. This may present a paradigm shift in crystallization strategies through the use of tunable contact-angle nucleators.

Original languageEnglish
Pages (from-to)11894-11895
Number of pages2
JournalJournal of the American Chemical Society
Volume127
Issue number34
Early online date6 Aug 2005
DOIs
Publication statusPublished - 31 Aug 2005
Externally publishedYes

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