Direct measurement of surface-induced orientational order parameter profile above the nematic-isotropic phase transition temperature.

Lee, Ji-Hoon.
Atherton, Timothy J.
Barna, Valentin.
De Luca, Antonio.
Bruno, Emanuela.
Petschek, Rolfe G.
Rosenblatt, Charles.

The spatial and temperature dependence of the surface-induced orientational order parameter S(z,T) was determined in the isotropic phase. An optical fiber was immersed in a thin liquid crystal layer and the retardation was measured as a function of the fiber's height above the surface, from which the model-independent S(z,T) was deduced with resolution ≲2  nm. It was found that (i) S(z=0)≲0.12 clo... read more

Liquid crystals.
Tufts University. Department of Physics and Astronomy.
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Original publication
J. H. Lee, T. J. Atherton, V. Barna, A. De Luca, E. Bruno, R. G. Petschek and C. Rosenblatt, Physical Review Letters 102 (16) (2009).
ID: tufts:18915
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