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Colloidal crystal growth monitored by Bragg diffraction interference fringes

Bohn, JJ and Tikhonov, A and Asher, SA (2010) Colloidal crystal growth monitored by Bragg diffraction interference fringes. Journal of Colloid and Interface Science, 350 (2). 381 - 386. ISSN 0021-9797

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We monitored the crystal growth kinetics of crystallization of a shear melted crystalline colloidal array (CCA). The fcc CCA heterogeneously nucleates at the flow cell wall surface. We examined the evolution of the (1. 1. 1) Bragg diffraction peak, and, for the first time, quantitatively monitored growth by measuring the temporal evolution of the Bragg diffraction interference fringes. Modeling of the evolution of the fringe patterns exposes the time dependence of the increasing crystal thickness. The initial diffusion-driven linear growth is followed by ripening-driven growth. Between 80 and 90 μM NaCl concentrations the fcc crystals first linearly grow at rates between 1.9 and 4.2 μm/s until they contact homogeneously nucleated crystals in the bulk. At lower salt concentrations interference fringes are not visible because the strong electrostatic interactions between particles result in high activation barriers, preventing defect annealing and leading to a lower crystal quality. The fcc crystals melt to a liquid phase at >90 μM NaCl concentrations. Increasing NaCl concentrations slow the fcc CCA growth rate consistent with the expectation of the classical Wilson-Frenkel growth theory. The final thickness of wall-nucleated CCA, that is determined by the competition between growth of heterogeneously and homogenously nucleated CCA, increases with higher NaCl concentrations. © 2010 Elsevier Inc.


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Item Type: Article
Status: Published
CreatorsEmailPitt UsernameORCID
Bohn, JJ
Tikhonov, A
Asher, SAasher@pitt.eduASHER
Date: 1 October 2010
Date Type: Publication
Journal or Publication Title: Journal of Colloid and Interface Science
Volume: 350
Number: 2
Page Range: 381 - 386
DOI or Unique Handle: 10.1016/j.jcis.2010.04.072
Schools and Programs: Dietrich School of Arts and Sciences > Chemistry
Refereed: Yes
ISSN: 0021-9797
MeSH Headings: Colloids--chemistry; Crystallization; Kinetics; Surface Properties
Other ID: NLM NIHMS204015, NLM PMC2926244
PubMed Central ID: PMC2926244
PubMed ID: 20542277
Date Deposited: 08 Feb 2013 20:58
Last Modified: 02 Feb 2019 16:55


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