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Issue 17, 2020

Viscoelastic properties of a thioether-based heliconical twist–bend nematogen

Author affiliations

Abstract

The twist–bend nematic (NTB) phase is one of the new types of nematics found recently, which possesses local nematic order with a heliconical orientational modulation at the nanoscale. Herein, we quantitatively determined, for the first time, the temperature-dependent elastic and viscosity properties in both the nematic (N) and NTB phases using a thioether-linked cyanobiphenyl dimer CBS7SCB exhibiting a broad temperature range of the NTB phase which is stable down to room temperature. In the N phase, the fundamental elastic moduli: splay and bend elastic moduli (K11 and K33, respectively) are found to be in the order of 10−12 N, and the effective rotational viscosity (γ1) is determined to be in the range of 5–200 mPa s. Meanwhile, the NTB phase is found to exhibit a compressive elastic modulus B in the order of several tens of kilopascals, the effective K11 in the order of 10−10–10−8 N, and a considerably large γ1 value of ∼68.7 Pa s right below the N–NTB phase transition. The present study provides insights into the comprehensive viscoelastic properties based on comparison of the obtained experimental data with not only the existing theoretical prediction but also the preceding experimental works.

Graphical abstract: Viscoelastic properties of a thioether-based heliconical twist–bend nematogen

Supplementary files

Article information


Submitted
20 Dec 2019
Accepted
01 Apr 2020
First published
01 Apr 2020

Phys. Chem. Chem. Phys., 2020,22, 9593-9599
Article type
Paper

Viscoelastic properties of a thioether-based heliconical twist–bend nematogen

J. Zhou, W. Tang, Y. Arakawa, H. Tsuji and S. Aya, Phys. Chem. Chem. Phys., 2020, 22, 9593 DOI: 10.1039/C9CP06861A

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