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Dynamic Inhibition of Constrained Crystallization by Mesoscopic Morphology Modifiers

Colussi, A. J. and Hoffmann, M. R. and Tang, Y. (2000) Dynamic Inhibition of Constrained Crystallization by Mesoscopic Morphology Modifiers. Langmuir, 16 (6). pp. 2405-2408. ISSN 0743-7463.

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We investigate the mechanisms by which two chemically diverse polymer additives affect crystal separation from hexacosane/decane solutions under various conditions. The additives are dissimilarly effective for delaying the onset of crystallization in supercooled solutions, although none, of course, ultimately prevents their reaching equilibrium. Remarkably, one polymer significantly raises the dissolution temperature of the crystal aggregates grown in its presence, even at sub-parts-per-million additive levels. More interesting is the finding that sufficiently large concentrations of either additive are able to cap at a common minimum thickness the porous layers formed on a cold surface swept by undersaturated solutions. The thin layers formed in the presence of crystallization inhibitors are mesoscopically more compact (i.e., have pore sizes about 10-fold smaller) than those produced in their absence, although all meltwhen rid of solventas neat hexacosane at 329.5 ± 0.5 K. We infer that inhibitors permanently limit the extent of crystal separation from undersaturated solutions subjected to fixed temperature constraints by blocking solute transfer across the boundary layer. This lasting action is mediated by the subtle modification of mesoscopic crystal morphology and is remotely related to the kinetics of isothermal crystal nucleation or the thermodynamics of phase separation.

Item Type:Article
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Colussi, A. J.0000-0002-3400-4101
Hoffmann, M. R.0000-0001-6495-1946
Additional Information:© 2000 American Chemical Society. Received August 10, 1999. In Final Form: January 25, 2000.
Issue or Number:6
Record Number:CaltechAUTHORS:20150623-154759732
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Official Citation:Dynamic Inhibition of Constrained Crystallization by Mesoscopic Morphology Modifiers A. J. Colussi, M. R. Hoffmann, and Y. Tang Langmuir 2000 16 (6), 2405-2408 DOI: 10.1021/la991085o
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:58491
Deposited By: George Porter
Deposited On:28 Jul 2015 19:52
Last Modified:03 Mar 2020 13:01

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