Correlation between crystalline order and vitrification in colloidal monolayers

Abstract

We investigate experimentally the relationship between local structure and dynamical arrest in a quasi-2d colloidal model system which approximates hard discs. We introduce polydispersity to the system to suppress crystallisation. Upon compression, the increase in structural relaxation time is accompanied by the emergence of local hexagonal symmetry. Examining the dynamical heterogeneity of the system, we identify three types of motion : "zero-dimensional" corresponding to beta-relaxation, "one-dimensional" or stringlike motion and "two-dimensional" motion. The dynamic heterogeneity is correlated with the local order, that is to say locally hexagonal regions are more likely to be dynamically slow. However we find that lengthscales corresponding to dynamic heterogeneity and local structure do not appear to scale together approaching the glass transition.

13 papes, to appear in J. Phys.: Condens. Matter

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Cited by in corpus (10)

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• Experimental Determination of Configurational Entropy in a Two-Dimensional Liquid under Random Pinning
• The glass transition in molecules, colloids and grains: universality and specificity
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• Structure in Sheared Supercooled Liquids: Dynamical Rearrangements of an Effective System of Icosahedra
• Yielding of a Model Glassformer: an Interpretation with an Effective System of Icosahedra