Dielectric Properties of Compounds Creating Dual-Frequency Nematic Liquid Crystals

• Authors: M. Mrukiewicz , P. Perkowski , K. Garbat , R. Dąbrowski , J. Parka
• Languages of publication: EN

Abstracts

EN

In this paper we report how dielectric spectroscopy can help in creating of dual-frequency nematic liquid crystals. Dual-frequency nematic liquid crystals is new class of liquid crystal materials. Such mixture is usually formed by a combination of many components (even more than 10), which can be split into two groups: molecules having large transverse dipole moment and molecules with a large longitudinal dipole moment. The behavior of a base (parent) mixture, functional admixtures and final dual-frequency nematic liquid crystals mixture is investigated by dielectric spectroscopy in wide frequency (100 Hz-10 MHz) and temperature ranges. This allows us to find out why the dual-frequency liquid crystal has an important feature: positive and negative dielectric anisotropy at different frequencies. We present parameters of molecular motions around short (S-mode) and long (L-mode) molecular axes observed in investigated materials and discuss how the creation of final dual-frequency nematic liquid crystals mixture can modify molecular relaxations.

Keywords

EN

77.22.Gm; 77.84.Nh; 61.30.-v

Discipline

• 77.22.Gm: Dielectric loss and relaxation
• 77.84.Nh: Liquids, emulsions, and suspensions; liquid crystals(for structure of liquid crystals, see 61.30.-v)
• 61.30.-v: Liquid crystals(for phase transitions in liquid crystals, see 64.70.M-; for liquid crystals as dielectric materials, see 77.84.Nh; for liquid crystals as optical materials, see 42.70.Df; for liquid crystal devices, see 42.79.Kr)

• Journal: Acta Physica Polonica A
• Year: 2013
• Volume: 124
• Issue: 6
• Pages: 940-945

Dates

published

2013-12

Contributors

author

M. Mrukiewicz

• Institute of Applied Physics, Military University of Technology, S. Kaliskiego 2, 00-908 Warsaw, Poland

author

P. Perkowski

• Institute of Applied Physics, Military University of Technology, S. Kaliskiego 2, 00-908 Warsaw, Poland

author

K. Garbat

• Institute of Chemistry, Military University of Technology, S. Kaliskiego 2, 00-908 Warsaw, Poland

author

R. Dąbrowski

• Institute of Chemistry, Military University of Technology, S. Kaliskiego 2, 00-908 Warsaw, Poland

author

J. Parka

• Institute of Applied Physics, Military University of Technology, S. Kaliskiego 2, 00-908 Warsaw, Poland

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Identifiers

DOI

10.12693/APhysPolA.124.940