Europhys. Lett.
Volume 69, Number 2, January 2005
Page(s) 221 - 227
Section Condensed matter: structure, mechanical and thermal properties
Published online 15 December 2004
Europhys. Lett., 69 (2), pp. 221-227 (2005)
DOI: 10.1209/epl/i2004-10322-3

Adsorption-induced anchoring transition in cylindrically confined liquid-crystal hydrophobic aerosil dispersions

T. Jin and D. Finotello

Department of Physics, Kent State University - Kent, OH 44242, USA

received 12 August 2004; accepted in final form 5 November 2004
published online 15 December 2004

An adsorption-induced anchoring transition was found by confining liquid-crystal hydrophobic aerosil dispersions to cylindrical pores. The aerosil effects on the director configurations and on the orientational-order wetting at the pore walls were determined by DNMR. The aerosil spheres are adsorbed at the pore wall, hindering the planar anchoring and inducing an axial-to-radial structural transition dependent on increasing aerosil density. The orientational-order surface wetting in the isotropic phase is modified by the aerosil-introduced disorder from quasi-complete to partial to non-wetting.

61.30.Pq - Microconfined liquid crystals: droplets, cylinders, randomly confined liquid crystals, polymer dispersed liquid crystals, and porous systems.
64.70.Md - Transitions in liquid crystals.
68.08.Bc - Wetting.

© EDP Sciences 2005