Investigations on the electrical conductivity and complex dielectric permittivity of a ferrofluid subjected to the action of a polarizing magnetic field

Mălăescu, I.; Bunoiu, Madalin O.; Teusdea, Alexandrina; Marin, C.N.

doi:10.1016/j.materresbull.2023.112281

Cited by 2 publications

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“…A similar result for a ferrofluid sample was reported in Ref. [31]. When inserting A h , B h and C h samples between capacitor armatures, the electric field lines will be perpendicular to the microstructures induced by polymerization in a magnetic field.…”

Section: Investigation Of Complex Dielectric Permittivitysupporting

confidence: 85%

“…For a fixed frequency, f, the RLC meter indicated resistance, R, and reactance, X, in the presence of a composite sample within the capacitor and resistance, R 0 , and reactance, X 0 , in the absence of a sample in the capacitor. Components ε ′ and ε ′′ of the complex dielectric permittivity were determined with the following relations [31,32]:…”

Section: Investigation Of Complex Dielectric Permittivitymentioning

confidence: 99%

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The Effect of Magnetically Induced Local Structure and Volume Fraction on the Electromagnetic Properties of Elastomer Samples with Ferrofluid Droplet Inserts

Marin,

Malaescu

2024

Magnetochemistry

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The magnetic permeability (μ), dielectric permittivity (ε) and electrical conductivity (σ) of six elastomer samples obtained by mixing silicone rubber (RTV-530) with a kerosene-based ferrofluid in different volume fractions (φ), 1.31%, 2.59% and 3.84%, were determined using complex impedance measurements over a frequency range of 500 Hz–2 MHz. Three samples (A0, B0 and C0) were manufactured in the absence of a magnetic field, and the other three samples (Ah, Bh and Ch) were manufactured in the presence of a magnetic field, H = 43 kA/m. The component μ″ of the complex effective magnetic permeability of all samples presents a maximum at a frequency, fmax, that moves to higher values by increasing φ, with this maximum being attributed to Brownian relaxation processes. The conductivity spectrum, σ (f), of all samples follows the Jonscher universal law, which allows for both the determination of the static conductivity, σDC, and the barrier energy of the electrical conduction process, Wm. For the same φ, Wm is lower, and σDC is higher in the samples Ah, Bh and Ch than in the samples A0, B0 and C0. The performed study is useful in manufacturing elastomers with predetermined properties and for possible applications such as magneto-dielectric flexible electronic devices, which can be controlled by the volume fraction of particles or by an external magnetic field.

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Section: Investigation Of Complex Dielectric Permittivitysupporting

confidence: 85%

Section: Investigation Of Complex Dielectric Permittivitymentioning

confidence: 99%