Mesomorphism in a binary mixture of non-mesogens: A dielectric spectroscopy investigation

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4 Citations (Scopus)

Abstract

We report on thermal microscopy and low frequency dielectric relaxation of a liquid crystal formed by mixing cholesterol with 1-hexadecanol. Though both components are non-mesogenic, the mixture is found to exhibit a smectic A phase. A 1 Vp-p a. c signal of 100 kHz was used to study the dielectric response, while the frequency was varied from 5 Hz to 10 MHz for relaxation studies. The dielectric loss in the smectic A phase exhibits a single Debye-type off-centered relaxation in the MHz region. The temperature variation of the relaxation frequency is presented by Arrhenius plots, and the corresponding activation energy is estimated. The temperature variation of the dielectric strength (Δε = ε0 - ε ) and the distribution parameter a in the smectic phase are estimated. The mesomorphic behavior of binary systems, where both components are non-mesomorphic, is discussed.

Original languageEnglish
Pages (from-to)659-664
Number of pages6
JournalZeitschrift fur Naturforschung - Section A Journal of Physical Sciences
Volume59
Issue number10
Publication statusPublished - Oct 2004

Fingerprint

Dielectric spectroscopy
Binary Mixtures
Binary mixtures
binary mixtures
Spectroscopy
Liquid Crystals
Arrhenius plots
Dielectric relaxation
Dielectric losses
spectroscopy
Dielectric Relaxation
Microscopic examination
Binary System
Cholesterol
Activation energy
Activation Energy
Microscopy
Liquid Crystal
Temperature
Low Frequency

Keywords

  • Dielectric Permittivity
  • Dielectric Relaxation
  • Smectic Liquid Crystals

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

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title = "Mesomorphism in a binary mixture of non-mesogens: A dielectric spectroscopy investigation",
abstract = "We report on thermal microscopy and low frequency dielectric relaxation of a liquid crystal formed by mixing cholesterol with 1-hexadecanol. Though both components are non-mesogenic, the mixture is found to exhibit a smectic A phase. A 1 Vp-p a. c signal of 100 kHz was used to study the dielectric response, while the frequency was varied from 5 Hz to 10 MHz for relaxation studies. The dielectric loss in the smectic A phase exhibits a single Debye-type off-centered relaxation in the MHz region. The temperature variation of the relaxation frequency is presented by Arrhenius plots, and the corresponding activation energy is estimated. The temperature variation of the dielectric strength (Δε = ε0 - ε ∞) and the distribution parameter a in the smectic phase are estimated. The mesomorphic behavior of binary systems, where both components are non-mesomorphic, is discussed.",
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TY - JOUR

T1 - Mesomorphism in a binary mixture of non-mesogens

T2 - A dielectric spectroscopy investigation

AU - George, A. K.

AU - Potukuchi, D. M.

AU - Al-Harthi, S. H.

AU - Carboni, C.

PY - 2004/10

Y1 - 2004/10

N2 - We report on thermal microscopy and low frequency dielectric relaxation of a liquid crystal formed by mixing cholesterol with 1-hexadecanol. Though both components are non-mesogenic, the mixture is found to exhibit a smectic A phase. A 1 Vp-p a. c signal of 100 kHz was used to study the dielectric response, while the frequency was varied from 5 Hz to 10 MHz for relaxation studies. The dielectric loss in the smectic A phase exhibits a single Debye-type off-centered relaxation in the MHz region. The temperature variation of the relaxation frequency is presented by Arrhenius plots, and the corresponding activation energy is estimated. The temperature variation of the dielectric strength (Δε = ε0 - ε ∞) and the distribution parameter a in the smectic phase are estimated. The mesomorphic behavior of binary systems, where both components are non-mesomorphic, is discussed.

AB - We report on thermal microscopy and low frequency dielectric relaxation of a liquid crystal formed by mixing cholesterol with 1-hexadecanol. Though both components are non-mesogenic, the mixture is found to exhibit a smectic A phase. A 1 Vp-p a. c signal of 100 kHz was used to study the dielectric response, while the frequency was varied from 5 Hz to 10 MHz for relaxation studies. The dielectric loss in the smectic A phase exhibits a single Debye-type off-centered relaxation in the MHz region. The temperature variation of the relaxation frequency is presented by Arrhenius plots, and the corresponding activation energy is estimated. The temperature variation of the dielectric strength (Δε = ε0 - ε ∞) and the distribution parameter a in the smectic phase are estimated. The mesomorphic behavior of binary systems, where both components are non-mesomorphic, is discussed.

KW - Dielectric Permittivity

KW - Dielectric Relaxation

KW - Smectic Liquid Crystals

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