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Defect-mediated colloidal interactions in a nematic-phase discotic solvent

Interactions between colloidal inclusions dispersed in a nematic discotic liquid-crystalline solvent were investigated for different solute–solvent coupling conditions. The solvent was treated at the level of Gay–Berne discogens. Colloidal inclusions were coupled to the solvent with a generalized sp...

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Autores principales: González-Martínez, Aurora D., Chávez-Rojo, Marco A., Sambriski, Edward J., Moreno-Razo, José A.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society of Chemistry 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9073280/
https://www.ncbi.nlm.nih.gov/pubmed/35529161
http://dx.doi.org/10.1039/c9ra05377h
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author González-Martínez, Aurora D.
Chávez-Rojo, Marco A.
Sambriski, Edward J.
Moreno-Razo, José A.
author_facet González-Martínez, Aurora D.
Chávez-Rojo, Marco A.
Sambriski, Edward J.
Moreno-Razo, José A.
author_sort González-Martínez, Aurora D.
collection PubMed
description Interactions between colloidal inclusions dispersed in a nematic discotic liquid-crystalline solvent were investigated for different solute–solvent coupling conditions. The solvent was treated at the level of Gay–Berne discogens. Colloidal inclusions were coupled to the solvent with a generalized sphere-ellipsoid interaction potential. Energy strengths were varied to promote either homeotropic or planar mesogenic anchoring. Colloid–colloid interactions were modeled using a soft, excluded-volume contribution. Single-colloid and colloid-pair samples were evolved with Molecular Dynamics simulations. Equilibrium trajectories were used to characterize structural and dynamical properties of topological defects arising in the mesomorphic phase due to colloidal inclusions. Boojums were observed with planar anchoring, whereas Saturn rings were obtained with homeotropic anchoring. The manner in which these topological defects drive colloidal interactions was assessed through a free energy analysis, taking into account the relative orientation between a colloidal dyad and the nematic-field director. The dynamical behavior of defects was qualitatively surveyed from equilibrium trajectories borne from computer simulations.
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spelling pubmed-90732802022-05-06 Defect-mediated colloidal interactions in a nematic-phase discotic solvent González-Martínez, Aurora D. Chávez-Rojo, Marco A. Sambriski, Edward J. Moreno-Razo, José A. RSC Adv Chemistry Interactions between colloidal inclusions dispersed in a nematic discotic liquid-crystalline solvent were investigated for different solute–solvent coupling conditions. The solvent was treated at the level of Gay–Berne discogens. Colloidal inclusions were coupled to the solvent with a generalized sphere-ellipsoid interaction potential. Energy strengths were varied to promote either homeotropic or planar mesogenic anchoring. Colloid–colloid interactions were modeled using a soft, excluded-volume contribution. Single-colloid and colloid-pair samples were evolved with Molecular Dynamics simulations. Equilibrium trajectories were used to characterize structural and dynamical properties of topological defects arising in the mesomorphic phase due to colloidal inclusions. Boojums were observed with planar anchoring, whereas Saturn rings were obtained with homeotropic anchoring. The manner in which these topological defects drive colloidal interactions was assessed through a free energy analysis, taking into account the relative orientation between a colloidal dyad and the nematic-field director. The dynamical behavior of defects was qualitatively surveyed from equilibrium trajectories borne from computer simulations. The Royal Society of Chemistry 2019-10-17 /pmc/articles/PMC9073280/ /pubmed/35529161 http://dx.doi.org/10.1039/c9ra05377h Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by/3.0/
spellingShingle Chemistry
González-Martínez, Aurora D.
Chávez-Rojo, Marco A.
Sambriski, Edward J.
Moreno-Razo, José A.
Defect-mediated colloidal interactions in a nematic-phase discotic solvent
title Defect-mediated colloidal interactions in a nematic-phase discotic solvent
title_full Defect-mediated colloidal interactions in a nematic-phase discotic solvent
title_fullStr Defect-mediated colloidal interactions in a nematic-phase discotic solvent
title_full_unstemmed Defect-mediated colloidal interactions in a nematic-phase discotic solvent
title_short Defect-mediated colloidal interactions in a nematic-phase discotic solvent
title_sort defect-mediated colloidal interactions in a nematic-phase discotic solvent
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9073280/
https://www.ncbi.nlm.nih.gov/pubmed/35529161
http://dx.doi.org/10.1039/c9ra05377h
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