Dramatic slowing of compositional relaxations in the approach to the glass transition for a bimodal colloidal suspension

S. D. W. Hannam, P. J. Daivis, and G. Bryant
Phys. Rev. E 96, 022609 – Published 22 August 2017

Abstract

Molecular dynamics simulation was used to study a model colloidal suspension with two species of slightly different sized colloidal particles in an explicit solvent. In this work we calculated the four interdiffusion coefficients for the ternary system, which were then used to calculate the decay coefficients D± of the two independent diffusive modes. We found that the slower D decay mode, which is associated with the system's ability to undergo compositional changes, was responsible for the long-time decay in the intermediate scattering function. We also found that a decrease in D to negligible values at a packing fraction of Φg=0.592 resulted in an extreme slow-down in the long-time decay of the intermediate scattering function often associated with the glass transition. Above Φg, the system formed a long-lived metastable state that did not relax to its equilibrium crystal state within the simulation time window. We concluded that the inhibition of crystallization was caused by the inability of the quenched fluid to undergo the compositional changes needed for the formation of the equilibrium crystal.

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  • Received 3 March 2017

DOI:https://doi.org/10.1103/PhysRevE.96.022609

©2017 American Physical Society

Physics Subject Headings (PhySH)

Polymers & Soft MatterStatistical Physics & ThermodynamicsCondensed Matter, Materials & Applied Physics

Authors & Affiliations

S. D. W. Hannam, P. J. Daivis*, and G. Bryant

  • School of Science and Centre for Molecular and Nanoscale Physics, RMIT University, G. P. O. Box 2476, Melbourne, Victoria 3001, Australia

  • *peter.daivis@rmit.edu.au

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Vol. 96, Iss. 2 — August 2017

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