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2016 | 130 | 3 | 748-750
Article title

Theoretical Study of Nematic to Isotropic Transition in Porous Media

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EN
Abstracts
EN
Experimental observations show that the N-I transition temperature (T_{NI}) for liquid crystals embedded in solid porous materials is lower compared to that of the bulk liquid crystals and T_{NI} is reduced linearly with the inverse pore diameter. To explain this, various theoretical studies have been proposed. We propose to use the mean field approach. We modify the Maier-Saupe mean field theory to include the disordering effects of porosity as a disordering surface potential. A molecule near the surface is assumed to feel the mean field potential (the Maier-Saupe type) and also the surface induced potential. We calculate the values of the nematic order parameter and hence find the T_{NI} for different pore diameters. The weighted average of the order parameter is calculated considering the cylindrical symmetry of the pores. Our calculations on the variation of T_{NI} with pore diameter agree with experimental data. Also, the calculated values of specific heat peak decrease with decrease in pore radius, in agreement with experimental trends.
Keywords
Year
Volume
130
Issue
3
Pages
748-750
Physical description
Dates
published
2016-09
received
2015-12-21
(unknown)
2016-06-10
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Document Type
Publication order reference
YADDA identifier
bwmeta1.element.bwnjournal-article-appv130n315kz
Identifiers
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