Repozytorium
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Kolekcje
Inne
Shift of the critical mixing temperature in strong electric fields. Theory and experiment.
Autorzy
Rok wydania
2014
Czasopismo
Journal of Physical Chemistry B
Numer woluminu
118
Strony
7187-7194
DOI
10.1021/jp503654e
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
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 Piekara’s factor. We find that the critical anomaly of Piekara’s 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 (∂Tc/∂E2) = (−22 ± 10) × 10–16 (K m2)/V2. In the theoretical part we amend Landau and Lifshitz’s formula and show that the downward shift of Tc can be estimated from a simple mean-field theory taking into account the linear and quadratic terms in an expansion of the constitutive relation ε(x) between the electric constant ε and mixture composition x.
Adres publiczny
http://dx.doi.org/10.1021/jp503654e
Strona internetowa wydawcy
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