Weak Correlations between Local Density and Dynamics near the Glass Transition

by: JC Conrad, FW Starr, DA Weitz

J. Phys. Chem. B, Vol. 109, No. 45. (17 November 2005), pp. 21235-21240.

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DOI, American Chem. Soc. Publications

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Abstract

We perform experiments on two different dense colloidal suspensions with confocal microscopy to probe the relationship between local structure and dynamics near the glass transition. We calculate the Voronoi volume for our particles and show that this quantity is not a universal probe of glassy structure for all colloidal suspensions. We correlate the Voronoi volume to displacement and find that these quantities are only weakly correlated. We observe qualitatively similar results in a simulation of a polymer melt. These results suggest that the Voronoi volume does not predict dynamical behavior in experimental colloidal suspensions; a purely structural approach based on local single particle volume likely cannot describe the colloidal glass transition.

@article{conrad05, abstract = {We perform experiments on two different dense colloidal suspensions with confocal microscopy to probe the relationship between local structure and dynamics near the glass transition. We calculate the Voronoi volume for our particles and show that this quantity is not a universal probe of glassy structure for all colloidal suspensions. We correlate the Voronoi volume to displacement and find that these quantities are only weakly correlated. We observe qualitatively similar results in a simulation of a polymer melt. These results suggest that the Voronoi volume does not predict dynamical behavior in experimental colloidal suspensions; a purely structural approach based on local single particle volume likely cannot describe the colloidal glass transition.}, author = {Conrad, J. C. and Starr, F. W. and Weitz, D. A. }, citeulike-article-id = {733339}, doi = {http://dx.doi.org/10.1021/jp0514168}, journal = {J. Phys. Chem. B}, keywords = {colloids, confocal, glass, pmma, structure}, month = {November}, number = {45}, pages = {21235--21240}, posted-at = {2007-09-27 05:33:46}, priority = {0}, title = {Weak Correlations between Local Density and Dynamics near the Glass Transition}, url = {http://dx.doi.org/10.1021/jp0514168}, volume = {109}, year = {2005} }

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TY - JOUR ID - conrad05 L3 - citeulike-article-id:733339 TI - Weak Correlations between Local Density and Dynamics near the Glass Transition JF - J. Phys. Chem. B VL - 109 IS - 45 SP - 21235 EP - 21240 N2 - We perform experiments on two different dense colloidal suspensions with confocal microscopy to probe the relationship between local structure and dynamics near the glass transition. We calculate the Voronoi volume for our particles and show that this quantity is not a universal probe of glassy structure for all colloidal suspensions. We correlate the Voronoi volume to displacement and find that these quantities are only weakly correlated. We observe qualitatively similar results in a simulation of a polymer melt. These results suggest that the Voronoi volume does not predict dynamical behavior in experimental colloidal suspensions; a purely structural approach based on local single particle volume likely cannot describe the colloidal glass transition. KW - colloids KW - confocal KW - glass KW - pmma KW - structure AU - Conrad, JC AU - Starr, FW AU - Weitz, DA PY - 2005/11/17/ UR - http://dx.doi.org/10.1021/jp0514168 ER -

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