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Defect Structures of Magnetic Nanoparticles in Smectic A Liquid Crystals
Topological defects in anisotropic fluids like liquid crystals serve as a playground for the research of various effects. In this study, we concentrated on a hybrid system of chiral rod-like molecules doped by magnetic nanoparticles. In textures of the smectic A phase, we observed linear defects and...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8466402/ https://www.ncbi.nlm.nih.gov/pubmed/34577188 http://dx.doi.org/10.3390/molecules26185717 |
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author | Novotná, Vladimíra Lejček, Lubor Hamplová, Věra Vejpravová, Jana |
author_facet | Novotná, Vladimíra Lejček, Lubor Hamplová, Věra Vejpravová, Jana |
author_sort | Novotná, Vladimíra |
collection | PubMed |
description | Topological defects in anisotropic fluids like liquid crystals serve as a playground for the research of various effects. In this study, we concentrated on a hybrid system of chiral rod-like molecules doped by magnetic nanoparticles. In textures of the smectic A phase, we observed linear defects and found that clusters of nanoparticles promote nucleation of smectic layer defects just at the phase transition from the isotropic to the smectic A (SmA) phase. In different geometries, we studied and analysed creation of defects which can be explained by attractive elastic forces between nanoparticles in the SmA phase. On cooling the studied hybrid system, clusters grow up to the critical dimension, and the smectic texture is stabilised. The presented effects are theoretically described and explained if we consider the elastic interaction of two point defects and stabilisation of prismatic dislocation loops due to the presence of nanoparticles. |
format | Online Article Text |
id | pubmed-8466402 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-84664022021-09-27 Defect Structures of Magnetic Nanoparticles in Smectic A Liquid Crystals Novotná, Vladimíra Lejček, Lubor Hamplová, Věra Vejpravová, Jana Molecules Article Topological defects in anisotropic fluids like liquid crystals serve as a playground for the research of various effects. In this study, we concentrated on a hybrid system of chiral rod-like molecules doped by magnetic nanoparticles. In textures of the smectic A phase, we observed linear defects and found that clusters of nanoparticles promote nucleation of smectic layer defects just at the phase transition from the isotropic to the smectic A (SmA) phase. In different geometries, we studied and analysed creation of defects which can be explained by attractive elastic forces between nanoparticles in the SmA phase. On cooling the studied hybrid system, clusters grow up to the critical dimension, and the smectic texture is stabilised. The presented effects are theoretically described and explained if we consider the elastic interaction of two point defects and stabilisation of prismatic dislocation loops due to the presence of nanoparticles. MDPI 2021-09-21 /pmc/articles/PMC8466402/ /pubmed/34577188 http://dx.doi.org/10.3390/molecules26185717 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Novotná, Vladimíra Lejček, Lubor Hamplová, Věra Vejpravová, Jana Defect Structures of Magnetic Nanoparticles in Smectic A Liquid Crystals |
title | Defect Structures of Magnetic Nanoparticles in Smectic A Liquid Crystals |
title_full | Defect Structures of Magnetic Nanoparticles in Smectic A Liquid Crystals |
title_fullStr | Defect Structures of Magnetic Nanoparticles in Smectic A Liquid Crystals |
title_full_unstemmed | Defect Structures of Magnetic Nanoparticles in Smectic A Liquid Crystals |
title_short | Defect Structures of Magnetic Nanoparticles in Smectic A Liquid Crystals |
title_sort | defect structures of magnetic nanoparticles in smectic a liquid crystals |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8466402/ https://www.ncbi.nlm.nih.gov/pubmed/34577188 http://dx.doi.org/10.3390/molecules26185717 |
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