Magneto dielectric response of a ferrofluid at low temperature

Derriche, O.; Jorat, L.; Noyel, G.; Monin, J.

doi:10.1016/0304-8853(91)90136-x

Cited by 18 publications

(11 citation statements)

References 11 publications

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“…Using these values and the frequency values f m corresponding to the maximum of the dependencies on frequency of the dielectric loss factor, tan δ r at constant temperature, with relation [5] the relaxation times were calculated. The obtained values for τ are presented in Table 1.…”

Section: Resultsmentioning

confidence: 99%

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Dielectric Behavior of Some Ferrofluids in Low-Frequency Fields

Mălăescu

Marin

2002

Journal of Colloid and Interface Science

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Section: Resultsmentioning

confidence: 99%

“…E-mail: malaescu@email.ro. (5) reported the dependence of the dielectric parameters (ε and ε ) of a ferrofluid with Fe 2 CoO 4 particles dispersed in dibutyl phthalate at temperatures, between −90…”

Section: Introductionmentioning

confidence: 99%

Dielectric Behavior of Some Ferrofluids in Low-Frequency Fields

Mălăescu

Marin

2002

Journal of Colloid and Interface Science

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“…In our experimental conditions, for volume concentrations > 5% we have detected an inhomogeneity of solutions a t low temperature when a continuous magnetic field is applied [7]. Thus, we have used results of complex permittivity vs. temperature with HI or HI,, …”

Section: Resultsmentioning

confidence: 97%

“…It allows us to get useful information about the shape of particles [6] or the stability and homogeneity of these liquids over a wide temperature range [7,8]. In the case of an homogeneous ferrofluid, the concentration in ferrites will modify the dielectric response of the carrier liquid progressively and without anomalies.…”

Section: Introductionmentioning

confidence: 98%

Dielectric anisotropy of the magnetic fluid cobalt ferrite in dibutylphthalate

Jorat

Siblini

Blanc-Mignon

et al. 1994

IEEE Trans. Dielect. Electr. Insul.

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This paper presents an experimental dielectric study of a ferrofluid, magnetic particles of FeaCoOd dispersed in dibutyl phthalate at different volume concentrations over a large temperature range (40 t o -lOO.C),, between 1 mHz and 10 MHa, with and without a continuous axial or radial magnetic field. The analysis of static permittivity indicates that the magnetodielectric anisotropy which exists at room temperature, persists at lower temperature, near the glass transition temperature of the carrier liquid. Moreover these results show a possible existence and growth of aggregates at the upper concentrations of ferrites. The position of the relaxation peaks of different solutions is modified by the presence of an axial continuous magnetic field.

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“…They are magneto--dielectric materials and represent a convenient model system to investigate fundamental properties of nanoparticle systems. Thus, many authors have performed research on dielectric properties of magnetic uids such as: the magneto-dielectric eect [2,3], the experimental dependence on temperature of the complex dielectric permittivity [4,5], the low frequency dependence of the dielectric permittivity at room temperature [6], the dielectric behaviour in the microwave range [7].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Low Frequency Polarization Mechanisms in Magnetic Fluids

2013

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The dielectric behaviour of a magnetic uid with magnetite particles dispersed in kerosene was analyzed. Therefore, the frequency (f ) and temperature (T ) dependences of the complex dielectric permittivity, ε(f, T ), over the ranges 4 kHz to 2 MHz and 25• C to 90• C were measured. Based on the experimental results of ε(f, T ) and using the ClausiusMossotti equation, we have determined the temperature dependence of the real part of the total polarizability α , of a magnetic uid. The computations have taken into account that the magnetic uid consists of three components, namely magnetite particles, surfactant, and carrier liquid. The results show that at a given frequency, α increases with temperature in the low frequency range (4 kHz to 100 kHz) and decreases with temperature above 100 kHz. This behaviour demonstrates that in low frequency range the polarization mechanism related to the deformation of the counter ions atmosphere around each particle is predominant and above 100 kHz the orientation of the dipole moments is the main polarization mechanism of the magnetic uid. These measurements enabled the evaluation of the eective dipole moment of the magnetic uid, in order of 1.21 × 10 −30 C m.

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Magneto dielectric response of a ferrofluid at low temperature

Cited by 18 publications

References 11 publications

Dielectric Behavior of Some Ferrofluids in Low-Frequency Fields

Dielectric Behavior of Some Ferrofluids in Low-Frequency Fields

Dielectric anisotropy of the magnetic fluid cobalt ferrite in dibutylphthalate

Investigation of the Low Frequency Polarization Mechanisms in Magnetic Fluids

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