NDLI: Structure–property correlation of a hockey stick-shaped compound exhibiting N-SmA-SmC<sub>a</sub> phase transitions

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Structure–property correlation of a hockey stick-shaped compound exhibiting N-SmA-SmC_a phase transitions

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Soft Matter Vol - 8 Issue - 6

Soft Matter Vol - 8 Issue - 5

Structure–property correlation of a hockey stick-shaped compound exhibiting N-SmA-SmC_a phase transitions

Content Provider	Royal Society of Chemistry (RSC)
Author	Sathyanarayana, P. Radhika, S. Sadashiva, B. K. Dhara, Surajit
Copyright Year	2012
Abstract	We report the measurement of birefringence, dielectric constant, splay, bend elastic constants and rotational viscosity in the nematic phase (N) of a hockey stick-shaped compound exhibiting smectic-A (SmA) and anticlinic smectic-C (SmCa) phase transitions at lower temperature. It is found that the physical properties are significantly different than calamitics and partially similar to the bent-core liquid crystals. It exhibits the positive dielectric and the negative elastic anisotropy. The optical and the thermal measurements show that all the transitions are first order. The rotational viscosity is comparatively higher than calamitic liquid crystals and exhibits weak pre-transitional divergence. The temperature dependent static dielectric measurements indicate antiparallel correlation of both the longitudinal and the transverse components of dipole moments in both the smectic phases. The parallel component of the dielectric constant exhibits a single Debye type relaxation in all the phases. The activation energy in the N, SmA and SmCa phases are comparatively larger than that of the respective phases of calamitic liquid crystals and can partially be attributed to the higher rotational viscosity of the hockey stick-shaped compound.
Starting Page	2322
Ending Page	2327
Page Count	6
File Format	HTM / HTML PDF
ISSN	1744683X
Volume Number	8
Issue Number	7
Journal	Soft Matter
DOI	10.1039/c2sm06767f
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Liquid crystal Anisotropy Relative permittivity Dipole Birefringence Rotational viscosity Dielectric Activation energy
Content Type	Text
Resource Type	Article
Subject	Chemistry Condensed Matter Physics

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