On calculating the ferrofluid leakproof loading

Cotae, C.; Cǎlugǎru, Gh.

doi:10.1109/tmag.1981.1061172

Cited by 3 publications

(6 citation statements)

References 7 publications

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“…The ferrofluid was prepared accordingly to Cotae (1981), [12] (magnetite -i.e. iron oxide Fe 3 O 4 , stabilized with ammonia oleate), ferrophase volume fraction being of 1.5%, the saturation magnetization of 10,34 kA/m and the physical diameter ranging between 4 and 25 nm.…”

Section: Biological Materialmentioning

confidence: 99%

Fluorescent bacteria for colloidal iron biosensors

et al. 2005

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This research was focused on the possibility of iron sensing by means of bacterial cultures. The effect of ferric and ferrous ions on Pseudomonas aeruginosa, which has the ability to uptake the environmental iron in the form of complex iron compositions named siderophores, characterized by luminescent features, was studied. The different sensitivity to the iron from oxide compounds in comparison to the iron from chlorides and sulfate was emphasized by means of fluorescence measurements. It could be stated that Pseudomonas aeruginosa, from human body specimens could be the biological component of an iron biosensor for ferrofluid traces reminiscent after the administration for medical purposes.

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Section: Biological Materialmentioning

confidence: 99%

Fluorescent bacteria for colloidal iron biosensors

et al. 2005

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“…Magnetodielectric effect in magnetic fluids have been investigated by many workers [1][2][3][4][5][6][7][8][9][10][11][12] both experimentally and theoretically. The experimental investigations were based on impedance measurement techniques where the magnetic fluid is placed in a capacitor.…”

Section: Introductionmentioning

confidence: 99%

“…Measurements of the impedance parameters such as the modulus and phase are carried out using a bridge or an RLC meter. [1][2][3][4][5][6][7][8] It is known that impedance measurement techniques suffer some serious disadvantages such as electrode effects, parasitic impedances, skin depth, and accuracy related problems. Very recently Yusuf et al 9 have determined the magnetodielectric effect from magnetooptical measurements where the disadvantages suffered by conventional impedance measurement techniques are avoided.…”

Section: Introductionmentioning

confidence: 99%

Numerical calculation of the magnetodielectric anisotropy effect in magnetic fluids

et al. 1996

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The magnetodielectric anisotropy effect in Fe 3 O 4 particle magnetic fluid has been numerically calculated. Our results, in agreement with previously reported results, show that the dielectric constant in the direction parallel to the field increases with the applied field, while that normal to the field decreases. The results also, in agreement with previous results, show that the dielectric constant in the field direction increases with temperature above a given temperature T s reaching a maximum at T m then decreases for higher temperatures; while in the direction normal to the field it decreases with temperature for temperatures above T s reaching a minimum at T m then increases for higher temperatures. Furthermore, our results show the important role that dimensionality plays on the magnetodielectric anisotropy effect.

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“…If we accept hypothesis about local dierential changes of permittivity and density caused by action of strong electric eld, then there exists a volume force due to the heterogeneous eld and anisotropy of insulator medium. Investigation of origin and existence of space charge between electrodes shows [5] that action of electric eld causes polarization of magnetic uid components in nanometric range. As a consequence of this process the gradient force aecting the polarized particles exist.…”

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confidence: 99%

“…The value of g was either 2 or 1 [810]. Experimentally, Cotae [5] and Espurz et al [1] have obtained the value of 1 for g(H, ω) while Mailfert and Nahounou [2] have obtained a value of 2. Experimental results of Espurz et al [1] show that the value of g(H, ω) is 1 at low elds and 1.23 at high elds.…”

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confidence: 99%

Magnetodielectric Properties of Transformer Oil Based Magnetic Fluids

et al. 2012

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This contribution is devoted to study of dielectric and magnetodielectric properties in transformer oil based magnetic uid. The dielectric permittivity and their anisotropy at various mutual orientation electric (50 Hz) and magnetic eld were shown at the dierent volume concentrations of nanoparticles at room temperature. The linear increase of dielectric constant with volume concentration was conrmed which is in good agreement with the theoretical Maxwell prediction. The dielectric anisotropy factor g(B, ω) is very close to g = 1. The values of permittivity increased with the increase of volume fraction of magnetite nanoparticles. The highest value of anisotropy characterized by deviation of permittivity ∆ε = ε ∥ − ε ⊥ was found for the highest volume concentration which could mean that no aggregation of magnetite nanoparticles had appeared.

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On calculating the ferrofluid leakproof loading

Cited by 3 publications

References 7 publications

Fluorescent bacteria for colloidal iron biosensors

Fluorescent bacteria for colloidal iron biosensors

Numerical calculation of the magnetodielectric anisotropy effect in magnetic fluids

Magnetodielectric Properties of Transformer Oil Based Magnetic Fluids

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