Author(s) | |
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Abstract |
Possible phases in a nematic liquid crystal confined to a spherical submicrometer droplet embedded in a solid polymer are analyzed in terms of a Landau-de Gennes theory. For a droplet with a radial structure we show that the strength of the nematic-polymer interfacial interaction affects the nematic-paranematic (partially ordered isotropic phase) phase transition and may in addition induce a boundary-layer nematic phase. This boundary layer phase exists only in a narrow (approximately 0.1 K) temperature interval above the nematic phase for a restricted range of interfacial interactions. Also in the radial structure the degree of ordering is suppressed close to the center of the droplet where a defect is located. As the size of the droplet decreases, the relative size of this region of suppressed ordering increases. Below a critical radius R(c) (0.22-mu-m for 4-n-pentyl-4'-cyanobiphenyl), if the surface interaction is above a critical value (q(max) = 1.85 x 10(-3)), the transition between the nematic phase and the paranematic phase no longer occurs. A three-dimensional phase diagram is presented to demonstrate the effect of the surface interaction strength, droplet radius, and sample temperature on the stability of phases within a droplet. |
Format | |
Identifier(s) | |
Publication Date |
1991-03-15
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Publication Title |
Physical Review A
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Volume |
43
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Issue |
6
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First Page |
2943
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Last Page |
2952
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Keywords | |
Subject | |
Rights |
http://rightsstatements.org/vocab/InC/1.0/
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Community | |
Comments | |
Permalink | https://oaks.kent.edu/phypubs/45 |
Kralj, S., Zumer, S., & Allender, D. (1991). Nematic-Isotropic Phase-Transition in a Liquid-Crystal Droplet (1–). Physical Review A. https://doi.org/10.1103/PhysRevA.43.2943
Kralj, S., S. Zumer, and David Allender. 1991. “Nematic-Isotropic Phase-Transition in a Liquid-Crystal Droplet”. Physical Review A. https://doi.org/10.1103/PhysRevA.43.2943.
Kralj, S., et al. Nematic-Isotropic Phase-Transition in a Liquid-Crystal Droplet. Physical Review A, 15 Mar. 1991, https://doi.org/10.1103/PhysRevA.43.2943.
Copyright 1991 American Physical Society. Available on publisher's site at http://dx.doi.org/10.1103/PhysRevA.43.2943.