Theory and computation of directional nematic phase ordering

Autores
Soulé, Ezequiel Rodolfo; Abukhdeir, Nasser Mohieddin; Pereyra, Alejandro Daniel
Año de publicación
2009
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
A computational study of morphological instabilities of a two-dimensional nematic front under directional growth was performed using a Landau–de Gennes-type quadrupolar tensor order parameter model for the first-order isotropic-nematic transition of 5CB (pentyl-cyanobiphenyl). A previously derived energy balance, taking anisotropy into account, was utilized to account for latent heat and an imposed morphological gradient in the time-dependent model. Simulations were performed using an initially homeotropic isotropic-nematic interface. Thermal instabilities in both the linear and nonlinear regimes were observed and compared to past experimental and theoretical observations. A sharp-interface model for the study of linear morphological instabilities, taking into account additional complexity resulting from liquid-crystalline order, was derived. Results from the sharp-interface model were compared to those from full two-dimensional simulation identifying the specific limitations of simplified sharp-interface models for this liquid-crystal system. In the nonlinear regime, secondary instabilities were observed to result in the formation of defects, interfacial heterogeneities, and bulk texture dynamics.
Fil: Soulé, Ezequiel Rodolfo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones en Ciencia y Tecnología de Materiales. Universidad Nacional de Mar del Plata. Facultad de Ingeniería. Instituto de Investigaciones en Ciencia y Tecnología de Materiales; Argentina
Fil: Abukhdeir, Nasser Mohieddin. McGill University; Canadá
Fil: Pereyra, Alejandro Daniel. McGill University; Canadá
Materia
Phase Transitions
Directional Growth
Morphological Instability
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/66217
Acceder
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network_name_str CONICET Digital (CONICET)
spelling Theory and computation of directional nematic phase orderingSoulé, Ezequiel RodolfoAbukhdeir, Nasser MohieddinPereyra, Alejandro DanielPhase TransitionsDirectional GrowthMorphological Instabilityhttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1A computational study of morphological instabilities of a two-dimensional nematic front under directional growth was performed using a Landau–de Gennes-type quadrupolar tensor order parameter model for the first-order isotropic-nematic transition of 5CB (pentyl-cyanobiphenyl). A previously derived energy balance, taking anisotropy into account, was utilized to account for latent heat and an imposed morphological gradient in the time-dependent model. Simulations were performed using an initially homeotropic isotropic-nematic interface. Thermal instabilities in both the linear and nonlinear regimes were observed and compared to past experimental and theoretical observations. A sharp-interface model for the study of linear morphological instabilities, taking into account additional complexity resulting from liquid-crystalline order, was derived. Results from the sharp-interface model were compared to those from full two-dimensional simulation identifying the specific limitations of simplified sharp-interface models for this liquid-crystal system. In the nonlinear regime, secondary instabilities were observed to result in the formation of defects, interfacial heterogeneities, and bulk texture dynamics.Fil: Soulé, Ezequiel Rodolfo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones en Ciencia y Tecnología de Materiales. Universidad Nacional de Mar del Plata. Facultad de Ingeniería. Instituto de Investigaciones en Ciencia y Tecnología de Materiales; ArgentinaFil: Abukhdeir, Nasser Mohieddin. McGill University; CanadáFil: Pereyra, Alejandro Daniel. McGill University; CanadáAmerican Physical Society2009-12info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/66217Soulé, Ezequiel Rodolfo; Abukhdeir, Nasser Mohieddin; Pereyra, Alejandro Daniel; Theory and computation of directional nematic phase ordering; American Physical Society; Physical Review E: Statistical, Nonlinear and Soft Matter Physics; 79; 2; 12-2009; 21702-217021539-3755CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1103/PhysRevE.79.021702info:eu-repo/semantics/altIdentifier/url/https://journals.aps.org/pre/abstract/10.1103/PhysRevE.79.021702info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:27:43Zoai:ri.conicet.gov.ar:11336/66217instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 10:27:43.562CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Theory and computation of directional nematic phase ordering
title Theory and computation of directional nematic phase ordering
spellingShingle Theory and computation of directional nematic phase ordering
Soulé, Ezequiel Rodolfo
Phase Transitions
Directional Growth
Morphological Instability
title_short Theory and computation of directional nematic phase ordering
title_full Theory and computation of directional nematic phase ordering
title_fullStr Theory and computation of directional nematic phase ordering
title_full_unstemmed Theory and computation of directional nematic phase ordering
title_sort Theory and computation of directional nematic phase ordering
dc.creator.none.fl_str_mv Soulé, Ezequiel Rodolfo
Abukhdeir, Nasser Mohieddin
Pereyra, Alejandro Daniel
author Soulé, Ezequiel Rodolfo
author_facet Soulé, Ezequiel Rodolfo
Abukhdeir, Nasser Mohieddin
Pereyra, Alejandro Daniel
author_role author
author2 Abukhdeir, Nasser Mohieddin
Pereyra, Alejandro Daniel
author2_role author
author
dc.subject.none.fl_str_mv Phase Transitions
Directional Growth
Morphological Instability
topic Phase Transitions
Directional Growth
Morphological Instability
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv A computational study of morphological instabilities of a two-dimensional nematic front under directional growth was performed using a Landau–de Gennes-type quadrupolar tensor order parameter model for the first-order isotropic-nematic transition of 5CB (pentyl-cyanobiphenyl). A previously derived energy balance, taking anisotropy into account, was utilized to account for latent heat and an imposed morphological gradient in the time-dependent model. Simulations were performed using an initially homeotropic isotropic-nematic interface. Thermal instabilities in both the linear and nonlinear regimes were observed and compared to past experimental and theoretical observations. A sharp-interface model for the study of linear morphological instabilities, taking into account additional complexity resulting from liquid-crystalline order, was derived. Results from the sharp-interface model were compared to those from full two-dimensional simulation identifying the specific limitations of simplified sharp-interface models for this liquid-crystal system. In the nonlinear regime, secondary instabilities were observed to result in the formation of defects, interfacial heterogeneities, and bulk texture dynamics.
Fil: Soulé, Ezequiel Rodolfo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones en Ciencia y Tecnología de Materiales. Universidad Nacional de Mar del Plata. Facultad de Ingeniería. Instituto de Investigaciones en Ciencia y Tecnología de Materiales; Argentina
Fil: Abukhdeir, Nasser Mohieddin. McGill University; Canadá
Fil: Pereyra, Alejandro Daniel. McGill University; Canadá
description A computational study of morphological instabilities of a two-dimensional nematic front under directional growth was performed using a Landau–de Gennes-type quadrupolar tensor order parameter model for the first-order isotropic-nematic transition of 5CB (pentyl-cyanobiphenyl). A previously derived energy balance, taking anisotropy into account, was utilized to account for latent heat and an imposed morphological gradient in the time-dependent model. Simulations were performed using an initially homeotropic isotropic-nematic interface. Thermal instabilities in both the linear and nonlinear regimes were observed and compared to past experimental and theoretical observations. A sharp-interface model for the study of linear morphological instabilities, taking into account additional complexity resulting from liquid-crystalline order, was derived. Results from the sharp-interface model were compared to those from full two-dimensional simulation identifying the specific limitations of simplified sharp-interface models for this liquid-crystal system. In the nonlinear regime, secondary instabilities were observed to result in the formation of defects, interfacial heterogeneities, and bulk texture dynamics.
publishDate 2009
dc.date.none.fl_str_mv 2009-12
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/66217
Soulé, Ezequiel Rodolfo; Abukhdeir, Nasser Mohieddin; Pereyra, Alejandro Daniel; Theory and computation of directional nematic phase ordering; American Physical Society; Physical Review E: Statistical, Nonlinear and Soft Matter Physics; 79; 2; 12-2009; 21702-21702
1539-3755
CONICET Digital
CONICET
url http://hdl.handle.net/11336/66217
identifier_str_mv Soulé, Ezequiel Rodolfo; Abukhdeir, Nasser Mohieddin; Pereyra, Alejandro Daniel; Theory and computation of directional nematic phase ordering; American Physical Society; Physical Review E: Statistical, Nonlinear and Soft Matter Physics; 79; 2; 12-2009; 21702-21702
1539-3755
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1103/PhysRevE.79.021702
info:eu-repo/semantics/altIdentifier/url/https://journals.aps.org/pre/abstract/10.1103/PhysRevE.79.021702
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv American Physical Society
publisher.none.fl_str_mv American Physical Society
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 13.070432

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