Dynamics of colloidal particles in ice

We use x-ray photon correlation spectroscopy (XPCS) to probe the dynamics of colloidal particles in polycrystalline ice. During freezing, the dendritic ice morphology and rejection of particles from the ice created regions of high particle density, where some of the colloids were forced into contact...

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Bibliographic Details
Published in:The Journal of chemical physics 2011-12, Vol.135 (22), p.224706-224706-5
Main Authors: Spannuth, Melissa, Mochrie, S. G. J., Peppin, S. S. L., Wettlaufer, J. S.
Format: Article
Language:English
Subjects:
MATERIALS SCIENCE
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Summary:We use x-ray photon correlation spectroscopy (XPCS) to probe the dynamics of colloidal particles in polycrystalline ice. During freezing, the dendritic ice morphology and rejection of particles from the ice created regions of high particle density, where some of the colloids were forced into contact and formed disordered aggregates. The particles in these high density regions underwent ballistic motion, with a characteristic velocity that increased with temperature. This ballistic motion is coupled with both stretched and compressed exponential decays of the intensity autocorrelation function. We suggest that this behavior could result from ice grain boundary migration.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.3665927