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Crystal polymorphism of 8OCB liquid crystal consisting of strongly polar rod-like molecules

We report detailed experimental studies on the different crystal polymorphs of 8OCB (4′-octyloxy-4-cyanobiphenyl) obtained by cooling the sample from its melt. The 8OCB liquid crystal has a stable crystal phase which is known as commercial powder (CP) phase. In addition, it also exhibits various met...

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Autores principales: Ghosh, Subhadip, Roy, Arun
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society of Chemistry 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8694550/
https://www.ncbi.nlm.nih.gov/pubmed/35424446
http://dx.doi.org/10.1039/d0ra08543j
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author Ghosh, Subhadip
Roy, Arun
author_facet Ghosh, Subhadip
Roy, Arun
author_sort Ghosh, Subhadip
collection PubMed
description We report detailed experimental studies on the different crystal polymorphs of 8OCB (4′-octyloxy-4-cyanobiphenyl) obtained by cooling the sample from its melt. The 8OCB liquid crystal has a stable crystal phase which is known as commercial powder (CP) phase. In addition, it also exhibits various metastable crystal phases such as square-plate, needle phase and long parallelepiped (PP) phase. We identify the metastable crystal state often found on cooling the sample from its melt as PP phase which transforms to stable CP phase on aging at room temperature or by heating it above 312 K. Based on our experimental results, we find that the stable CP crystal phase of 8OCB is not a single homogeneous phase but is the coexistence of fibrillar nano-crystallites embedded in an amorphous phase. The heterogeneous nature of its stable crystal state is an intriguing feature of this pure compound consisting of relatively small rod-like molecules with a strong dipole moment along their long axis.
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spelling pubmed-86945502022-04-13 Crystal polymorphism of 8OCB liquid crystal consisting of strongly polar rod-like molecules Ghosh, Subhadip Roy, Arun RSC Adv Chemistry We report detailed experimental studies on the different crystal polymorphs of 8OCB (4′-octyloxy-4-cyanobiphenyl) obtained by cooling the sample from its melt. The 8OCB liquid crystal has a stable crystal phase which is known as commercial powder (CP) phase. In addition, it also exhibits various metastable crystal phases such as square-plate, needle phase and long parallelepiped (PP) phase. We identify the metastable crystal state often found on cooling the sample from its melt as PP phase which transforms to stable CP phase on aging at room temperature or by heating it above 312 K. Based on our experimental results, we find that the stable CP crystal phase of 8OCB is not a single homogeneous phase but is the coexistence of fibrillar nano-crystallites embedded in an amorphous phase. The heterogeneous nature of its stable crystal state is an intriguing feature of this pure compound consisting of relatively small rod-like molecules with a strong dipole moment along their long axis. The Royal Society of Chemistry 2021-01-26 /pmc/articles/PMC8694550/ /pubmed/35424446 http://dx.doi.org/10.1039/d0ra08543j Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by-nc/3.0/
spellingShingle Chemistry
Ghosh, Subhadip
Roy, Arun
Crystal polymorphism of 8OCB liquid crystal consisting of strongly polar rod-like molecules
title Crystal polymorphism of 8OCB liquid crystal consisting of strongly polar rod-like molecules
title_full Crystal polymorphism of 8OCB liquid crystal consisting of strongly polar rod-like molecules
title_fullStr Crystal polymorphism of 8OCB liquid crystal consisting of strongly polar rod-like molecules
title_full_unstemmed Crystal polymorphism of 8OCB liquid crystal consisting of strongly polar rod-like molecules
title_short Crystal polymorphism of 8OCB liquid crystal consisting of strongly polar rod-like molecules
title_sort crystal polymorphism of 8ocb liquid crystal consisting of strongly polar rod-like molecules
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8694550/
https://www.ncbi.nlm.nih.gov/pubmed/35424446
http://dx.doi.org/10.1039/d0ra08543j
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