Physical Mechanisms of Magnetic Field Effects on the Dielectric Function of Hybrid Magnetorheological Suspensions

In this paper, we study the electrical properties of new hybrid magnetorheological suspensions (hMRSs) and propose a theoretical model to explain the dependence of the electric capacitance on the iron volumetric fraction, <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML&...

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Autores principales:	Gabriela-Eugenia Iacobescu, Ioan Bica, Larisa-Marina-Elisabeth Chirigiu
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	hybrid magnetorheological suspension flat capacitor iron microparticles coupling coefficient magnetic dipoles Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
Acceso en línea:	https://doaj.org/article/f45bd5f560a64deb80cda8133f8ecc8e
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spelling	oai:doaj.org-article:f45bd5f560a64deb80cda8133f8ecc8e2021-11-11T18:04:20ZPhysical Mechanisms of Magnetic Field Effects on the Dielectric Function of Hybrid Magnetorheological Suspensions10.3390/ma142164981996-1944https://doaj.org/article/f45bd5f560a64deb80cda8133f8ecc8e2021-10-01T00:00:00Zhttps://www.mdpi.com/1996-1944/14/21/6498https://doaj.org/toc/1996-1944In this paper, we study the electrical properties of new hybrid magnetorheological suspensions (hMRSs) and propose a theoretical model to explain the dependence of the electric capacitance on the iron volumetric fraction, <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi mathvariant="sans-serif">Φ</mi><mrow><mi>F</mi><mi>e</mi></mrow></msub></mrow></semantics></math></inline-formula>, of the dopants and on the external magnetic field. The hMRSs, with dimensions of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>30</mn><mo> </mo><mi>mm</mi><mo>×</mo><mn>30</mn><mo> </mo><mi>mm</mi><mo>×</mo><mn>2</mn><mo> </mo><mi>mm</mi><mo>,</mo></mrow></semantics></math></inline-formula> were manufactured based on impregnating cotton fabric, during heating, with three solutions of iron microparticles in silicone oil. Flat capacitors based on these hMRSs were then produced. The time variation of the electric capacitance of the capacitors was measured in the presence and absence of a magnetic field, <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>B</mi></semantics></math></inline-formula>, in a time interval of 300 s, with <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi mathvariant="sans-serif">Δ</mi><mi>t</mi><mo>=</mo><mn>1</mn><mo> </mo><mi mathvariant="normal">s</mi></mrow></semantics></math></inline-formula> steps. It was shown that for specific values of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi mathvariant="sans-serif">Φ</mi><mrow><mi>F</mi><mi>e</mi></mrow></msub></mrow></semantics></math></inline-formula> and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>B</mi></semantics></math></inline-formula>, the coupling coefficient between the cotton fibers and the magnetic dipoles had values corresponding to very stable electrical capacitance. Using magnetic dipole approximation, the mechanisms underlying the observed phenomena can be described if the hMRSs are considered continuous media.Gabriela-Eugenia IacobescuIoan BicaLarisa-Marina-Elisabeth ChirigiuMDPI AGarticlehybrid magnetorheological suspensionflat capacitoriron microparticlescoupling coefficientmagnetic dipolesTechnologyTElectrical engineering. Electronics. Nuclear engineeringTK1-9971Engineering (General). Civil engineering (General)TA1-2040MicroscopyQH201-278.5Descriptive and experimental mechanicsQC120-168.85ENMaterials, Vol 14, Iss 6498, p 6498 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	hybrid magnetorheological suspension flat capacitor iron microparticles coupling coefficient magnetic dipoles Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
spellingShingle	hybrid magnetorheological suspension flat capacitor iron microparticles coupling coefficient magnetic dipoles Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 Gabriela-Eugenia Iacobescu Ioan Bica Larisa-Marina-Elisabeth Chirigiu Physical Mechanisms of Magnetic Field Effects on the Dielectric Function of Hybrid Magnetorheological Suspensions
description	In this paper, we study the electrical properties of new hybrid magnetorheological suspensions (hMRSs) and propose a theoretical model to explain the dependence of the electric capacitance on the iron volumetric fraction, <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi mathvariant="sans-serif">Φ</mi><mrow><mi>F</mi><mi>e</mi></mrow></msub></mrow></semantics></math></inline-formula>, of the dopants and on the external magnetic field. The hMRSs, with dimensions of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>30</mn><mo> </mo><mi>mm</mi><mo>×</mo><mn>30</mn><mo> </mo><mi>mm</mi><mo>×</mo><mn>2</mn><mo> </mo><mi>mm</mi><mo>,</mo></mrow></semantics></math></inline-formula> were manufactured based on impregnating cotton fabric, during heating, with three solutions of iron microparticles in silicone oil. Flat capacitors based on these hMRSs were then produced. The time variation of the electric capacitance of the capacitors was measured in the presence and absence of a magnetic field, <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>B</mi></semantics></math></inline-formula>, in a time interval of 300 s, with <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi mathvariant="sans-serif">Δ</mi><mi>t</mi><mo>=</mo><mn>1</mn><mo> </mo><mi mathvariant="normal">s</mi></mrow></semantics></math></inline-formula> steps. It was shown that for specific values of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi mathvariant="sans-serif">Φ</mi><mrow><mi>F</mi><mi>e</mi></mrow></msub></mrow></semantics></math></inline-formula> and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>B</mi></semantics></math></inline-formula>, the coupling coefficient between the cotton fibers and the magnetic dipoles had values corresponding to very stable electrical capacitance. Using magnetic dipole approximation, the mechanisms underlying the observed phenomena can be described if the hMRSs are considered continuous media.
format	article
author	Gabriela-Eugenia Iacobescu Ioan Bica Larisa-Marina-Elisabeth Chirigiu
author_facet	Gabriela-Eugenia Iacobescu Ioan Bica Larisa-Marina-Elisabeth Chirigiu
author_sort	Gabriela-Eugenia Iacobescu
title	Physical Mechanisms of Magnetic Field Effects on the Dielectric Function of Hybrid Magnetorheological Suspensions
title_short	Physical Mechanisms of Magnetic Field Effects on the Dielectric Function of Hybrid Magnetorheological Suspensions
title_full	Physical Mechanisms of Magnetic Field Effects on the Dielectric Function of Hybrid Magnetorheological Suspensions
title_fullStr	Physical Mechanisms of Magnetic Field Effects on the Dielectric Function of Hybrid Magnetorheological Suspensions
title_full_unstemmed	Physical Mechanisms of Magnetic Field Effects on the Dielectric Function of Hybrid Magnetorheological Suspensions
title_sort	physical mechanisms of magnetic field effects on the dielectric function of hybrid magnetorheological suspensions
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/f45bd5f560a64deb80cda8133f8ecc8e
work_keys_str_mv	AT gabrielaeugeniaiacobescu physicalmechanismsofmagneticfieldeffectsonthedielectricfunctionofhybridmagnetorheologicalsuspensions AT ioanbica physicalmechanismsofmagneticfieldeffectsonthedielectricfunctionofhybridmagnetorheologicalsuspensions AT larisamarinaelisabethchirigiu physicalmechanismsofmagneticfieldeffectsonthedielectricfunctionofhybridmagnetorheologicalsuspensions
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Physical Mechanisms of Magnetic Field Effects on the Dielectric Function of Hybrid Magnetorheological Suspensions

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