Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 19, Issue 32, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/19/32/326103
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We use density functional theory to study the capillary phase behaviour of a discotic system of colloidal platelets that are confined in a planar slit pore. The model plates have circular shape, continuous orientations and vanishing thickness; they interact via hard-core repulsion with each other and with the walls which induces homeotropic wall anchoring of the nematic director. We find that the isotropic-nematic capillary binodal is shifted to lower values of the chemical potential as compared to bulk isotropic-nematic coexistence. Capillary isotropic-nematic coexistence vanishes below a critical wall separation distance which is significantly larger than it is in a reference system of thin hard (Onsager) rods confined between two parallel hard walls that act on the particle centres.
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