Journal article
OPTICAL-PROPERTIES OF A LIQUID-CRYSTAL ISOTROPIC-PHASE IN PORES
Z̆urnal ėksperimentalʹnoj i teoretic̆eskoj fiziki, Vol.99(5), pp.1512-1517
01 May 1991
Abstract
The temperature and angular dependences of the intensity of scattered light in the isotropic phase of a liquid crystal introduced into a porous silicate matrix with characteristic pore size of 10(3) angstrom and volume fraction of 0.38 are investigated. It is shown that the intensity of the scattered light in the system under investigation (in contrast to the system of an isotropic nonmesogenic liquid - a porous matrix) cannot be described by the sum of the intensities due to double scattering, proper scattering by the matrix, scattering due to mismatching of the refractive indexes of the matter in the pores and of the matrix material, scattering by fluctuations of the density and order parameter in the liquid crystal. The presence of appreciable excessive scattering comprising up to 45% of the total scattered light intensity, its dependence on the wave number and also the results of the temperature measurements are explained proceeding from the single assumption that for temperatures above the critical temperature the liquid crystal in the pores is a pseudo-two-phase medium with an anisotropic surface layer on the pore walls which arises as the result of orientation wetting. The scattering properties of the layer differ from those of the liquid crystal in the remaining volume due to scattering of light by fluctuations of the local director and anisotropy of the refractive index which are absent in the bulk isotropic phase.
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Details
- Title
- OPTICAL-PROPERTIES OF A LIQUID-CRYSTAL ISOTROPIC-PHASE IN PORES
- Creators
- F M AlievG Y VershovskayaL A Zubkov
- Publication Details
- Z̆urnal ėksperimentalʹnoj i teoretic̆eskoj fiziki, Vol.99(5), pp.1512-1517
- Publisher
- Mezhdunarodnaya Kniga
- Number of pages
- 6
- Resource Type
- Journal article
- Language
- Russian
- Academic Unit
- School of Biomedical Engineering, Science, and Health Systems; Drexel University
- Identifiers
- 991019342555804721
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- Web of Science research areas
- Physics, Multidisciplinary