Temperature dependent relative mass density measurement of a highly polar liquid crystal compound having multiple ferroelectric nematic phases.

Md Sakhawat Hossain
(Materials Science Graduate Program and Advanced Materials and Liquid Crystal Institute, Kent State University, Kent, OH 44242, USA)

Authors:

Md Sakhawat Hossain
(Materials Science Graduate Program and Advanced Materials and Liquid Crystal Institute, Kent State University, Kent, OH 44242, USA)

Rony Saha
(Department of Physics and Advanced Materials and Liquid Crystal Institute, Kent State University, Kent, OH 44242, USA)

Pawan Nepal
(Department of Chemistry and Biochemistry, Kent State University, Kent, OH 44242, USA)

Chenrun Feng
(Materials Science Graduate Program and Advanced Materials and Liquid Crystal Institute, Kent State University, Kent, OH 44242, USA)

James T. Gleeson
(Department of Physics, Kent State University, Kent, OH 44242, USA)

Samuel Sprunt
(Department of Physics and Advanced Materials and Liquid Crystal Institute, Kent State University, Kent, OH 44242, USA)

Robert J. Twieg
(Department of Chemistry and Biochemistry, Kent State University, Kent, OH 44242, USA)

Antal Jákli
(Department of Physics, Materials Science Graduate Program and Advanced Materials and Liquid Crystal Institute, Kent State University, Kent, OH 44242, USA)

The relative mass density measurement can represent both the polarity and the efficient molecular packing of a particular liquid crystal material. We studied the temperature dependence of the relative mass density of a new highly polar ferroelectric nematic compound, 4-nitrophenyl 4-[(2,4-dimethoxylbenzoyl) oxy]-2-fluorobenzoate (RT11001) that was found to have 3 different ferroelectric nematic phases (arXiv:2104.06520). A section of the 50 rectangular capillary was filled with the material and studied by polarized optical microscopy (POM) images for the better definition of the meniscus position. The temperature dependence of the relative mass density reveals the N-N_F1 and N_F1-N_F2 transitions seen by differential scanning calorimetry (DSC) but does not show any jump through the N_F2-N_F3 phase transitions. These results can be understood in view of recent x-ray scattering results (Multiple ferroelectric nematic phases of a highly polar liquid crystal compound, submitted to Journal of Materials Chemistry C - TC-ART-08-2021-003587).

*This research was supported by the National Science Foundation under grant DMR-1904167.

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Bulletin of the American Physical Society

APS March Meeting 2022

Volume 67, Number 3

Monday–Friday, March 14–18, 2022; Chicago

Session N00: Poster Session II (11am- 2pm CST)

Abstract: N00.00146 : Temperature dependent relative mass density measurement of a highly polar liquid crystal compound having multiple ferroelectric nematic phases.*

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