Correlation between crystalline order and vitrification in colloidal monolayers.
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IOP Publishing
https://doi.org/10.1088/0953-8984/27/19/194124
https://doi.org/10.1088/0953-8984/27/19/194124
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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 β-relaxation, 'one-dimensional' or stringlike motion and '2D' 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.
This work was supported by the Royal Society.
This is the accepted manuscript. It is under embargo until 29/04/2016. The final version is available from IOP at http://iopscience.iop.org/0953-8984/27/19/194124/article.
This work was supported by the Royal Society.
This is the accepted manuscript. It is under embargo until 29/04/2016. The final version is available from IOP at http://iopscience.iop.org/0953-8984/27/19/194124/article.