Wetting characterization elasticity

Director modes are, as opposed to biaxial fluctuations, excited very easily in the nematic phase, where their Hamiltonian is purely elastic, whereas in the isotropic phase they are characterized by a finite correlation length. This implies that their wetting-induced behavior should be quite the inverse of that of biaxial modes. Thus, in the disordering geometry, the director modes are forced out of the substrate-induced isotropic boundary layer into the nematic core (see Fig. 8.6 bottom). The lowest mode is a Goldstone mode. In the paranematic phase a few lowest director modes are confined to the nematic boundary layer, whereas the upper ones extend over the whole sample and are more or less the same as in the perfectly isotropic phase. 

Kasap, E., Altunbay, M., Georgi, D.T., 1999. Elow units from integrated WET and NMR data. In Schatzinger, R., Jordan, J. (Eds.), Reservoir Characterization—Recent Advances. AAPG Memoir, 71, American Association of Petroleum Geologists, Tulsa OK/USA, pp. 179-190. Katahara, K.W., 1996. Clay mineral elastic properties. In 66-th SEG-Meeting, Denver, Expanded Abstracts 11, pp. 1691-1694. 

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