Optical microscopic and ellipsometric studies of the spreading of a mesogeniccompound on a rough substrate are reported on. The smectic wets the surface and a precursor¯lm grows whose radius R scales like the square root of time t: R ¼ (Dt)1=2. The di®usioncoe±cient decreases with temperature and vanishes several degrees below the melting temperature,i.e. the solid phase also \spreads out" through a precursor ¯lm. The e®ect is analysedin terms of surface-induced premelting. This is the ¯rst report on such an e®ect in mesogenicmaterials.

Conventional and non-conventional spreading of a mesogenic material

BARBERI, Riccardo Cristoforo;SCARAMUZZA, Nicola;FORMOSO, Vincenzo;Bartolino R;
1996

Abstract

Optical microscopic and ellipsometric studies of the spreading of a mesogeniccompound on a rough substrate are reported on. The smectic wets the surface and a precursor¯lm grows whose radius R scales like the square root of time t: R ¼ (Dt)1=2. The di®usioncoe±cient decreases with temperature and vanishes several degrees below the melting temperature,i.e. the solid phase also \spreads out" through a precursor ¯lm. The e®ect is analysedin terms of surface-induced premelting. This is the ¯rst report on such an e®ect in mesogenicmaterials.
Liquid Crystals; Wetting; SURFACE-INDUCED ALIGNMENT
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.11770/134574
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