Title:	Crystal polymorphism of 8OCB liquid crystal consisting of strongly polar rod-like molecules
Authors:	Ghosh, Subhadip Roy, Arun
Keywords:	Crystal polymorphism
Issue Date:	Mar-2021
Publisher:	Royal Society of Chemistry
Citation:	RSC Advances, 2021, Vol. 11 P 4958
Abstract:	We report detailed experimental studies on the different crystal polymorphs of 8OCB (4′-octyloxy-4- yanobiphenyl) 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.
Description:	Open Access
URI:	http://hdl.handle.net/2289/7724
ISSN:	2046-2069 (Online)
Alternative Location:	https://pubs.rsc.org/en/content/articlelanding/2021/ra/d0ra08543j#!divAbstract
Copyright:	2021, Royal Society of Chemistry
Appears in Collections:	Research Papers (SCM)

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