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dc.contributor.author
Phillips, Paul M.  
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Mei, Ningsi  
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Soulé, Ezequiel Rodolfo  
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Reven, Linda  
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Rey, Alejandro D.  
dc.date.available
2016-11-14T18:48:36Z  
dc.date.issued
2011-09-25  
dc.identifier.citation
Phillips, Paul M.; Mei, Ningsi; Soulé, Ezequiel Rodolfo; Reven, Linda; Rey, Alejandro D.; Textures in polygonal arrangements of square nanoparticles in nematic liquid crystal matrices; American Chemical Society; Langmuir; 27; 21; 25-9-2011; 13335-13341  
dc.identifier.issn
0743-7463  
dc.identifier.uri
http://hdl.handle.net/11336/8193  
dc.description.abstract
A systematic analysis of defect textures in faceted nanoparticles with polygonal configurations embedded in a nematic matrix is performed using the Landau de Gennes model, homeotropic strong anchoring in a square domain with uniform alignment in the outer boundaries. Defect and textures are analyzed as functions of temperature T, polygon size R, and polygon number N. For nematic nanocomposites, the texture satisfies a defect charge balance equation between bulk and surface (particle corner) charges. Upon decreasing the temperature, the central bulk defects split and together with other -1/2 bulk defects are absorbed by the nanoparticle’s corners. Increasing the lattice size decreases confinement and eliminates bulk defects. Increasing the polygon number increases the central defect charge at high temperature and the number of surface defects at lower temperatures. The excess energy per particle is lower in even than in odd polygons, and it is minimized for a square particle arrangement. These discrete modeling results show for first time that, even under strong anchoring, defects are attached to particles as corner defects, leaving behind a low energy homogeneous orientation field that favors nanoparticle ordering in nematic matrices. These new insights are consistent with recent thermodynamic approaches to nematic nanocomposites that predict the existence of novel nematic/crystal phases and can be used to design nanocomposites with orientational and positional order.  
dc.format
application/pdf  
dc.language.iso
eng  
dc.publisher
American Chemical Society  
dc.rights
info:eu-repo/semantics/openAccess  
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/  
dc.subject
Facetted Nanoparticles  
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Nematic Liquid Crystal  
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Ingeniería de los Materiales  
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Ingeniería de los Materiales  
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INGENIERÍAS Y TECNOLOGÍAS  
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Físico-Química, Ciencia de los Polímeros, Electroquímica  
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Ciencias Químicas  
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CIENCIAS NATURALES Y EXACTAS  
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Nano-materiales  
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Nanotecnología  
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INGENIERÍAS Y TECNOLOGÍAS  
dc.title
Textures in polygonal arrangements of square nanoparticles in nematic liquid crystal matrices  
dc.type
info:eu-repo/semantics/article  
dc.type
info:ar-repo/semantics/artículo  
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info:eu-repo/semantics/publishedVersion  
dc.date.updated
2016-10-26T21:19:56Z  
dc.journal.volume
27  
dc.journal.number
21  
dc.journal.pagination
13335-13341  
dc.journal.pais
Estados Unidos  
dc.description.fil
Fil: Phillips, Paul M.. McGill University; Canadá  
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Fil: Mei, Ningsi. McGill University; Canadá  
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Fil: Soulé, Ezequiel Rodolfo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Mar del Plata. Instituto de Investigación en Ciencia y Tecnología de Materiales (i); Argentina. Universidad Nacional de Mar del Plata. Facultad de Ingeniería; Argentina  
dc.description.fil
Fil: Reven, Linda. McGill University; Canadá  
dc.description.fil
Fil: Rey, Alejandro D.. McGill University; Canadá  
dc.journal.title
Langmuir  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://pubs.acs.org/doi/pdfplus/10.1021/la203226g  
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info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1021/la203226g