Sensitive AC Hysteresigraph of Extended Driving Field Capability

Ercuţa, Aurel

doi:10.1109/tim.2019.2917237

Cited by 33 publications

(28 citation statements)

References 21 publications

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“…The surface area for various batches synthesized were repeated in the same conditions and the results indicate values within the standard error of 5%. The magnetic properties were investigated in 50 Hz alternating current (ac) fields of amplitudes up to 6.4 kOe by means of a laboratory-manufactured induction hysteresigraph [22]. The instrument provides two voltage signals reproducing the time evolution of the applied field and sample contribution to the magnetic flux (at 3 Oe/V, and 0.1 Mx/V, respectively, calibration error), which were recorded at 150 kHz sampling frequency to a PC by means of a 16 bit-resolution DT-9816A (DATA TRANSLATION) data acquisition card.…”

Section: Methodsmentioning

confidence: 99%

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Silica-Coated Magnetic Nanocomposites for Pb2+ Removal from Aqueous Solution

et al. 2020

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Magnetic iron oxide-silica shell nanocomposites with different iron oxide/silica ratio were synthesized and structurally characterized by Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), small-angle neutron scattering, magnetic and N 2 -sorption studies. The composite that resulted with the best properties in terms of contact surface area and saturation of magnetization was selected for Pb 2+ adsorption studies from aqueous media. The material presented good absorption capacity (maximum adsorption capacity 14.9 mg·g −1 ) comparable with similar materials presented in literature. Its chemico-physical stability and adsorption capacity recommend the nanocomposite as a cheap adsorbent material for lead.

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Section: Methodsmentioning

confidence: 99%

“…The saturation magnetization (technical) was estimated from extrapolating to 50 kOe the data resulted from fitting the hysteresis loop branches to a superposition of Langevin-type transition functions. [22]. The saturation magnetization was estimated from extrapolating to 50kOe the fitted data.…”

Section: Methodsmentioning

confidence: 99%

Silica-Coated Magnetic Nanocomposites for Pb2+ Removal from Aqueous Solution

et al. 2020

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“…For the analysis of magnetic properties, 276 g of

F is introduced in the measuring cell of a magnetometer and the measurements are performed under sine waveform driving field conditions by means of a laboratory-made ac induction hysteresis graph that is described in Ref. [ 37 ]. The saturation specific magnetization is found to be 22.7 Am

/kg, and is obtained at 477 kA/m, the remanent specific magnetization is 2.86 Am

/kg, and the intensity of coercive magnetic field is 12.33 kA/m [ 33 ].…”

Section: Structural and Magnetic Characterizationmentioning

confidence: 99%

Hybrid Magnetorheological Composites for Electric and Magnetic Field Sensors and Transducers

2020

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We present a simple, low-cost, and environmental-friendly method for the fabrication of hybrid magnetorheological composites (hMCs) based on cotton fibers soaked with a mixture of silicone oil (SO), carbonyl iron (CI) microparticles, and iron oxide microfibers (μF). The obtained hMCs, with various ratios (Φ) of SO and μF, are used as dielectric materials for manufacturing electrical devices. The equivalent electrical capacitance and resistance are investigated in the presence of an external magnetic field, with flux density B. Based on the recorded data, we obtain the variation of the relative dielectric constant (ϵr′), and electrical conductivity (σ), with Φ, and B. We show that, by increasing Φ, the distance between CI magnetic dipoles increases, and this leads to significant changes in the behaviour of ϵr′ and σ in a magnetic field. The results are explained by developing a theoretical model that is based on the dipolar approximation. They indicate that the obtained hMCs can be used in the fabrication of magneto-active fibers for fabrication of electric/magnetic field sensors and transducers.

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“…The magnetisation curves of MAFs are shown in Figure 1 , and were performed also under sine waveform driving field conditions by means of a laboratory-made ac induction hysteresis graph described in Reference [ 29 ]. The saturation specific magnetization occurs at about 477 kA/m, and together with the remanent specific magnetization, they generally increase with the volume fraction of mFe.…”

Section: Resultsmentioning

confidence: 99%

Electrical and Magnetodielectric Properties of Magneto-Active Fabrics for Electromagnetic Shielding and Health Monitoring

Bunoiu

Anitas

Pascu

et al. 2020

IJMS

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An efficient, low-cost and environmental-friendly method to fabricate magneto-active fabrics (MAFs) based on cotton fibers soaked with silicone oil and iron oxide microfibers (mFe) at mass fractions 2 wt.%, 4 wt.% and 8 wt.% is presented. It is shown that mFe induce good magnetic properties in MAFs, which are subsequently used as dielectric materials for capacitor fabrication. The electrical properties of MAFs are investigated in a static magnetic field with intensities of 0 kA/m, 160 kA/m and 320 kA/m, superimposed on a medium-frequency electric field. The influence of mFe on the electrical capacitance and dielectric loss tangent is determined, and it can be observed that the electrical conductivity, dielectric relaxation times and magnetodielectric effects are sensibly influenced by the applied magnetic and electric fields. The results indicate that the MAFs have electrical properties which could be useful for protection against electromagnetic pollution or for health monitoring.

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Sensitive AC Hysteresigraph of Extended Driving Field Capability

Cited by 33 publications

References 21 publications

Silica-Coated Magnetic Nanocomposites for Pb2+ Removal from Aqueous Solution

Silica-Coated Magnetic Nanocomposites for Pb2+ Removal from Aqueous Solution

Hybrid Magnetorheological Composites for Electric and Magnetic Field Sensors and Transducers

Electrical and Magnetodielectric Properties of Magneto-Active Fabrics for Electromagnetic Shielding and Health Monitoring

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