Nonlinear dielectric effect of dipolar fluid mixtures

Nagy, S.; Szalai, István

doi:10.1016/j.molliq.2011.08.014

Cited by 6 publications

(2 citation statements)

References 14 publications

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“…As mentioned above, K 4 can be alternatively written in the form of the fourth cumulant of the vector dipole moment 11,31,48,49…”

Section: Discussionmentioning

confidence: 99%

“…This means that the terms linear in N in H (3) and H (4) must vanish. Because of the importance of nonreducible multi-particle correlations, constructing approximate theories [48][49][50] for the nonlinear dielectric susceptibility is challenging. For instance, the quadratic hypernetted chain closure for dipolar liquids 39 produces a > 0, through the account for electrostriction, in disagreement with simulations.…”

Section: Nonlinear Dielectric Effectmentioning

confidence: 99%

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Multi-particle orientational correlations are responsible for the nonlinear dielectric effect: Analysis of temperature-dependent measurements for glycerol

Matyushov

2022

Preprint

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The nonlinear dielectric effect (NDE) is traditionally viewed as originating from saturation of the response of individual dipoles in a strong electric field. This mean-field view, mathematically described by the Langevin saturation function, predicts enhanced dielectric saturation at lower temperatures. In contrast, recent experiments for glycerol have shown a sharp increase of the NDE with increasing temperature. The NDE is a sum of a term representing binary correlations of dipolar orientations and terms referring to three- and four-particle orientational correlations. Analysis of experimental data shows that the contribution of three- and four-particle correlations strongly increases at elevated temperatures. The mean-field picture of dielectric saturation as the origin of the NDE is inconsistent with observations. A positive NDE (increment of the field-dependent dielectric constant) is predicted for low-concentration solutions of polar molecules in nonpolar solvents. The dependence of the NDE on the concentration of the polar component is polynomial.

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“…As mentioned above, K 4 can be alternatively written in the form of the fourth cumulant of the vector dipole moment 11,31,48,49…”

Section: Discussionmentioning

confidence: 99%