The layer thinning transitions in free-standing films of several liquid-crystal compounds containing different combinations of flexible tails have been systematically investigated. The results clearly indicate that fluorination of liquid-crystal compounds plays an essential role in the layer-by-layer thinning transitions of free-standing films above the bulk smectic-A–isotropic transition temperature [Formula Presented] The surface ordering effects of these fluorinated compounds above [Formula Presented] is contrasted with recent x-ray results that suggest surface disorder below [Formula Presented] in a fluorinated liquid-crystal compound.
|Original language||English (US)|
|Journal||Physical Review E - Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics|
|State||Published - Jan 1 1998|