A Short Review on the Rheology of Twist Grain Boundary-A and Blue Phase Liquid Crystals

Topological defects are important in determining the properties of physical systems and are known varyingly depending on the broken symmetry. In superfluid helium, they are called vortices; in periodic crystals, one refers to dislocations; and in liquid crystals, they are disclinations. The defects...

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Bibliographic Details
Published in:Fluids (Basel) 2018-06, Vol.3 (2), p.26
Main Authors: Sahoo, Rasmita, Dhara, Surajit
Format: Article
Language:English
Subjects:
BPs
Broken symmetry
Crystal defects
Crystals
Disclinations
Dislocations
Fluids
Grain boundaries
Helium
Liquid crystals
Phases
Point defects
Properties (attributes)
Rheological properties
Rheology
Superfluidity
TGBA
topological defects
Viscoelasticity
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Summary:Topological defects are important in determining the properties of physical systems and are known varyingly depending on the broken symmetry. In superfluid helium, they are called vortices; in periodic crystals, one refers to dislocations; and in liquid crystals, they are disclinations. The defects and the inter-defect interaction in some highly chiral liquid crystals stabilize some intermediate complex phases such as Blue Phases (BPs) and Twist Grain Boundary-A (TGBA) phases. The defect dynamics of these phases contributes to the rheological properties. The temperature range of these intermediate phases usually are very small in pure liquid crystals; consequently, a detailed experiment has been difficult to achieve. However, the temperature range could be enhanced significantly in multicomponent systems. In this review article, we discuss some recent experimental progress made in understanding the rheological properties of the wide-temperature-range TGBA and BP liquid crystals.
ISSN:2311-5521
2311-5521
DOI:10.3390/fluids3020026