On new scaling of dielectric response

Abstract

We present a new generalized scaling relationship accounting for relaxation processes of both the real and the imaginary parts of the complex dielectric permittivity data in a wide temperature range of dielectric media. It has been successfully used for experimental data related to various dynamics in liquid crystalline phases of: 4-bromobenzylidene-4′-pentyloxyanilin, 4-bromobenzylidene-4′-hexyloxyaniline, 4′-butyl-4-(2-methylbutoxy) azoxybenzene, and 4-ethyl-4′-octylazoxybenzene. Moreover, the scaling was checked for the theoretical data of Dissado-Hill cluster model. A comparison with earlier scaling, proposed by Nagel and Dendzik, is given.

On relaxation and vibrational dynamics in the thermodynamic states of a chiral smectogenic glass-former

“…The dielectric responses of the substance under study in various phases have been scaled according to the dependencies given in ref. 58–60. Fig.…”

“…Widely used phenomenological models, such as Cole–Cole or Havriliak–Negami, give no satisfactory descriptions of the wings of the maximum of the imaginary peak of permittivity, as shown in ref. 58–61. On the other hand, the scaled experimental data should be compared to scaled theoretical model/models describing the relaxation of the electric dipoles.…”

Conductive Network and β Polymorph Content Evolution Caused by Thermal Treatment in Carbon Nanotubes-BaTiO3 Hybrids Reinforced Polyvinylidene Fluoride Composites

“…After thermal treatment, even a slight change of CNT’s conductive network may cause strong interfacial polarization, which brings the noticeable increment of ε′ appearing at 100 Hz. However, a relatively low tan δ shows that in this stage tan δ still partly originates from Debye-relaxation, which assumes that the identical reorienting dipoles are noninteracting . This phenomenon may be attributed to BT particles in PVDF which play as buffers to block possible leakage current during the percolative behavior.…”

“…However, a relatively low tan δ shows that in this stage tan δ still partly originates from Debye-relaxation, which assumes that the identical reorienting dipoles are noninteracting. 25 This phenomenon may be attributed to BT particles in PVDF which play as buffers to block possible leakage current during the percolative behavior. Hence, CNT's good dispersion and BT's buffer effect can ensure the H-CNT-BT/PVDF composite near f c with high ε′ but low tan δ at 100 Hz after thermal treatment.…”

Dynamics of the Chiral Liquid Crystal 4′-Butyl-4-(S)-(2-methylbutoxy)azoxybenzene in the Isotropic, Cholesteric, and Solid Phases: A Fast Field-Cycling NMR Relaxometry Study

“…Different models are used in dielectric spectroscopy studies to express the spectral density and, therefore, to extract correlation times of motions from the analysis of experimental data; the most employed are empirical functions derived by a generalization of the simple BPP function (usually referred to as Debye function in dielectric spectroscopy), such as the Havriliak−Negami, Cole−Davidson, and Cole−Cole expressions (eq 7). 45,46,48 The relationship between susceptibility and spectral density can be used to establish analogies between BDS and 1 H NMR relaxometry by converting the NMRD data to a susceptibility representation. 49,50 χ ω ω ω ω ω ω χ ω χ ω…”