Related Experiment Video
Updated: Apr 25, 2026

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal
Published on: October 31, 2019
Rheology of twist-grain-boundary-A liquid crystals
Rasmita Sahoo1, J Ananthaiah1, R Dabrowski2
1School of Physics, University of Hyderabad, Hyderabad 500046, India.
Abstract:
We report studies on the rheological properties of a liquid crystalline analog of Abrikosov phase in type-II superconductors known as twist-grain-boundary-A (TGB(A)) phase. The TGB(A) phase shows a large apparent yield stress compared to the cholesteric (N*) phase. The storage modulus (G') of the TGB(A) phase is significantly larger than the loss modulus (G''). The dynamic relaxation measurements indicate a solid-like behavior of N*, TGB(A), and smectic-C* phases. The complex shear modulus of the TGB(A) phase exhibits a power-law behavior G*(ω) ∼ ω(α) with α ≃ 0.5. The relative amplitude of G' and G'' at various temperatures indicate that the enhanced elasticity of TGB(A) phase is due to the structural defects.
More Related Videos
Related Concept Videos
Angle of Twist - Elastic Range
Phase Transitions: Melting and Freezing
Polymer Classification: Crystallinity
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
Phase Transitions: Vaporization and Condensation
Phase Diagrams of Ternary Systems
Recrystallization: Solid–Solution Equilibria

