Shift of the Critical Mixing Temperature in Strong Electric Fields. Theory and Experiment

Kazimierz Orzechowski; Mariusz Adamczyk; Alicja Wolny; Yoav Tsori

doi:10.1021/jp503654e

Shift of the Critical Mixing Temperature in Strong Electric Fields. Theory and Experiment

Kazimierz Orzechowski, Mariusz Adamczyk, Alicja Wolny, Yoav Tsori

Department of Chemical Engineering

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20 Scopus citations

Abstract

We study the shift in the critical temperature T_c in binary mixtures in strong electric fields. In experiments we measure the nonlinear dielectric effect (NDE) in a mixture of nitrobenze and n-octane and calculate Piekaras factor. We find that the critical anomaly of Piekaras factor is a function of an electric field strength. We propose to explain this observation as a result of a downward shift of T_c, and this allows us to calculate (εT_c/εE²) = (-22 ± 10) × 10^-16 (K m²)/V². In the theoretical part we amend Landau and Lifshitzs formula and show that the downward shift of T _c can be estimated from a simple mean-field theory taking into account the linear and quadratic terms in an expansion of the constitutive relation μ(x) between the electric constant μ and mixture composition x.

Original language	English
Pages (from-to)	7187-7194
Number of pages	8
Journal	Journal of Physical Chemistry B
Volume	118
Issue number	25
DOIs	https://doi.org/10.1021/jp503654e
State	Published - 26 Jun 2014

ASJC Scopus subject areas

Physical and Theoretical Chemistry
Surfaces, Coatings and Films
Materials Chemistry

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title = "Shift of the Critical Mixing Temperature in Strong Electric Fields. Theory and Experiment",

abstract = "We study the shift in the critical temperature Tc in binary mixtures in strong electric fields. In experiments we measure the nonlinear dielectric effect (NDE) in a mixture of nitrobenze and n-octane and calculate Piekaras factor. We find that the critical anomaly of Piekaras factor is a function of an electric field strength. We propose to explain this observation as a result of a downward shift of Tc, and this allows us to calculate (εTc/εE2) = (-22 ± 10) × 10-16 (K m2)/V2. In the theoretical part we amend Landau and Lifshitzs formula and show that the downward shift of T c can be estimated from a simple mean-field theory taking into account the linear and quadratic terms in an expansion of the constitutive relation μ(x) between the electric constant μ and mixture composition x.",

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AU - Orzechowski, Kazimierz

AU - Adamczyk, Mariusz

AU - Wolny, Alicja

AU - Tsori, Yoav

PY - 2014/6/26

Y1 - 2014/6/26

N2 - We study the shift in the critical temperature Tc in binary mixtures in strong electric fields. In experiments we measure the nonlinear dielectric effect (NDE) in a mixture of nitrobenze and n-octane and calculate Piekaras factor. We find that the critical anomaly of Piekaras factor is a function of an electric field strength. We propose to explain this observation as a result of a downward shift of Tc, and this allows us to calculate (εTc/εE2) = (-22 ± 10) × 10-16 (K m2)/V2. In the theoretical part we amend Landau and Lifshitzs formula and show that the downward shift of T c can be estimated from a simple mean-field theory taking into account the linear and quadratic terms in an expansion of the constitutive relation μ(x) between the electric constant μ and mixture composition x.

AB - We study the shift in the critical temperature Tc in binary mixtures in strong electric fields. In experiments we measure the nonlinear dielectric effect (NDE) in a mixture of nitrobenze and n-octane and calculate Piekaras factor. We find that the critical anomaly of Piekaras factor is a function of an electric field strength. We propose to explain this observation as a result of a downward shift of Tc, and this allows us to calculate (εTc/εE2) = (-22 ± 10) × 10-16 (K m2)/V2. In the theoretical part we amend Landau and Lifshitzs formula and show that the downward shift of T c can be estimated from a simple mean-field theory taking into account the linear and quadratic terms in an expansion of the constitutive relation μ(x) between the electric constant μ and mixture composition x.

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Shift of the Critical Mixing Temperature in Strong Electric Fields. Theory and Experiment

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