Volume 74, Number 6, June 2006
|Page(s)||1039 - 1045|
|Section||Condensed matter: structural, mechanical and thermal properties|
|Published online||17 May 2006|
Hard colloidal rods near a soft wall: Wetting, drying, and symmetry breaking
Instituut-Lorentz for Theoretical Physics, Leiden University - Niels Bohrweg 2 Leiden, NL-2333 CA, The Netherlands
2 Institute for Theoretical Physics, Utrecht University - Leuvenlaan 4 3584 CE Utrecht, The Netherlands
Accepted: 26 April 2006
Within an Onsager-like density functional theory we explore the thermodynamic and structural properties of an isotropic and nematic fluid of hard needle-like colloids in contact with a hard substrate coated with a soft short-ranged attractive or repulsive layer. As a function of the range and the strength of the soft interactions we find wetting and drying transitions, a pre-drying line, and a symmetry-breaking transition from uniaxial to biaxial in the wetting and drying film.
PACS: 61.30.Hn – Surface phenomena: alignment, anchoring, anchoring transitions, surface-induced layering, surface-induced ordering, wetting, prewetting transitions, and wetting transitions / 64.70.Md – Transitions in liquid crystals / 05.70.Np – Interface and surface thermodynamics
© EDP Sciences, 2006
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