Dielectric and optical study of biaxial bent-core nematic liquid crystal

S. P. Sreenilayam; M. Nagaraj; Y. P. Panarin; J. K. Vij; C. Keith; C. Tschierske

doi:10.1080/15421406.2011.568335

Dielectric and optical study of biaxial bent-core nematic liquid crystal

S. P. Sreenilayam, M. Nagaraj, Y. P. Panarin, J. K. Vij, C. Keith, C. Tschierske

Research output: Contribution to journal › Article › peer-review

Abstract

We report the observation of biaxial nematic phase in a bent-core molecular system in which the biaxiality exists on a microscopic scale using polarizing microscopy, electro-optics and dielectric spectroscopy. An application of electric field induces a macroscopic biaxiality and therefore electro-optic switching. The observed electro-optic switching is explained in terms of the interaction of the ferroelectric clusters with the electric field. Dielectric spectra of the sample shows existence of low-frequency collective processes related to the microscopic polar clusters. The dielectric constant changes its sign from positive to negative and again to positive values.

Original language	English
Pages (from-to)	75-81
Number of pages	7
Journal	Molecular Crystals and Liquid Crystals
Volume	540
DOIs	https://doi.org/10.1080/15421406.2011.568335
Publication status	Published - 2011

Keywords

Bent-core molecules
biaxial nematic
dielectric relaxation
electro-optic effects
molecular and collective processes

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10.1080/15421406.2011.568335

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abstract = "We report the observation of biaxial nematic phase in a bent-core molecular system in which the biaxiality exists on a microscopic scale using polarizing microscopy, electro-optics and dielectric spectroscopy. An application of electric field induces a macroscopic biaxiality and therefore electro-optic switching. The observed electro-optic switching is explained in terms of the interaction of the ferroelectric clusters with the electric field. Dielectric spectra of the sample shows existence of low-frequency collective processes related to the microscopic polar clusters. The dielectric constant changes its sign from positive to negative and again to positive values.",

keywords = "Bent-core molecules, biaxial nematic, dielectric relaxation, electro-optic effects, molecular and collective processes",

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AU - Sreenilayam, S. P.

AU - Nagaraj, M.

AU - Panarin, Y. P.

AU - Vij, J. K.

AU - Keith, C.

AU - Tschierske, C.

PY - 2011

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AB - We report the observation of biaxial nematic phase in a bent-core molecular system in which the biaxiality exists on a microscopic scale using polarizing microscopy, electro-optics and dielectric spectroscopy. An application of electric field induces a macroscopic biaxiality and therefore electro-optic switching. The observed electro-optic switching is explained in terms of the interaction of the ferroelectric clusters with the electric field. Dielectric spectra of the sample shows existence of low-frequency collective processes related to the microscopic polar clusters. The dielectric constant changes its sign from positive to negative and again to positive values.

KW - Bent-core molecules

KW - biaxial nematic

KW - dielectric relaxation

KW - electro-optic effects

KW - molecular and collective processes

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SP - 75

EP - 81

JO - Molecular Crystals and Liquid Crystals

JF - Molecular Crystals and Liquid Crystals

ER -

Dielectric and optical study of biaxial bent-core nematic liquid crystal

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Keywords

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