Some specificities of wetting by cyanobiphenyl liquid crystals - Delabre, U. and Richard, C. and Cazabat, A. M.
JOURNAL OF PHYSICS-CONDENSED MATTER 21, (2009)
Abstract : The present paper provides an up to date restatement of the wetting
behaviour of the series of cyanobiphenyl liquid crystals (LCs) on usual
substrates, i.e. oxidized silicon wafers, water and glycerol, at both
the macroscopic and microscopic scale, in the nematic range of
temperature. We show that on water the systems are close to a wetting
transition, especially 5CB and 7CB. In that case, the wetting behaviour
is controlled by the presence of impurities. On a mesoscopic scale, we
observe for all our (thin LC film-substrate) systems an identical,
complex, but well defined general scenario, not accounted for by the
available models. In the last part, we present a study on line tension
which results from the specific organization of LCs at the edge of the
nematic film. We report preliminary results on two-dimensional film
coalescence where this line tension plays a major role.