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Effect of particle size distribution on crystallisation and the glass transition of hard sphere colloids

Author

Listed:
  • Henderson, S.I.
  • Mortensen, T.C.
  • Underwood, S.M.
  • van Megen, W.

Abstract

Phase behaviour, crystallisation kinetics and particle dynamics are compared for two colloidal suspensions of hard spherical particles with different particle size distributions; one is narrow and roughly symmetrical and the other is broader and skewed towards smaller particles. Both suspensions exhibit the equilibrium phase behaviour expected for a system of identical hard spheres and they show a glass transition, indicated by the cessation of homogeneous nucleation and the partial arrest of concentration fluctuations, at approximately the same volume fraction, Φg ≈ 0.58. Interestingly, compared to the suspension with the narrower size distribution, crystallisation rates are significantly slower in the more polydisperse suspension. In its colloidal glass state no crystal growth occurs on secondary nuclei, such as the shear-aligned crystals that can be induced in both suspensions by regular rocking.

Suggested Citation

  • Henderson, S.I. & Mortensen, T.C. & Underwood, S.M. & van Megen, W., 1996. "Effect of particle size distribution on crystallisation and the glass transition of hard sphere colloids," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 233(1), pages 102-116.
    • Handle: RePEc:eee:phsmap:v:233:y:1996:i:1:p:102-116
    DOI: 10.1016/S0378-4371(96)00153-7
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    References listed on IDEAS

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    1. Pusey, P.N. & Van Megen, W. & Underwood, S.M. & Bartlett, P. & Ottewill, R.H., 1991. "Colloidal fluids, crystals and glasses," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 176(1), pages 16-27.
    2. Van der Werff, J.C. & Ackerson, B.J. & May, R.P. & de Kruif, C.G., 1990. "Neutron scattering from dense colloidal dispersions at high shear rates: The deformation of the structure factor in the shear plane," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 165(3), pages 375-398.
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