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Phase separation and structure in a concentrated colloidal dispersion of uniform plates

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  • A. Brown
  • C. Ferrero
  • T. Narayanan
  • A. Rennie

Abstract

The structure and phase behaviour of a colloidal dispersion of plate-like particles are described. The plates are nickel (II) hydroxide and have short-range, repulsive interactions and a low polydispersity. As the concentration of the plates is increased, an equilibrium phase separation between a columnar phase and a less ordered phase is observed. Complementary measurements using small-angle neutron and small-angle X-ray scattering have been used to distinguish the columnar phase from other possible ordered structures. Previously isotropic-nematic phase transitions have been observed [1], however this dispersion forms the more highly ordered columnar phase, due to the aspect ratio and the low polydispersity of the plate-like particles. The concentration at which phase separation occurs, increases as the range of the particle interactions is reduced. This system provides an interesting model for comparison with theory and calculations of structures in liquid crystal and mesophase in which the particle interactions can be altered. Copyright Società Italiana di Fisica, Springer-Verlag 1999

Suggested Citation

  • A. Brown & C. Ferrero & T. Narayanan & A. Rennie, 1999. "Phase separation and structure in a concentrated colloidal dispersion of uniform plates," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 11(3), pages 481-489, October.
    • Handle: RePEc:spr:eurphb:v:11:y:1999:i:3:p:481-489:10.1007/s100510050959
    DOI: 10.1007/s100510050959
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