The Effect of Magnetically Induced Local Structure and Volume Fraction on the Electromagnetic Properties of Elastomer Samples with Ferrofluid Droplet Inserts
The magnetic permeability (<i>μ</i>), dielectric permittivity (<i>ε</i>) and electrical conductivity (<i>σ</i>) of six elastomer samples obtained by mixing silicone rubber (RTV-530) with a kerosene-based ferrofluid in different volume fractions (<i>φ</i&g...
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| Format: | Article |
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MDPI AG
2024-01-01
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| Series: | Magnetochemistry |
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| Online Access: | https://www.mdpi.com/2312-7481/10/1/4 |
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| author | Catalin N. Marin Iosif Malaescu |
| author_facet | Catalin N. Marin Iosif Malaescu |
| author_sort | Catalin N. Marin |
| collection | DOAJ |
| description | The magnetic permeability (<i>μ</i>), dielectric permittivity (<i>ε</i>) and electrical conductivity (<i>σ</i>) of six elastomer samples obtained by mixing silicone rubber (RTV-530) with a kerosene-based ferrofluid in different volume fractions (<i>φ</i>), 1.31%, 2.59% and 3.84%, were determined using complex impedance measurements over a frequency range of <i>500</i> Hz–<i>2</i> MHz. Three samples (A<sub>0</sub>, B<sub>0</sub> and C<sub>0</sub>) were manufactured in the absence of a magnetic field, and the other three samples (A<sub>h</sub>, B<sub>h</sub> and C<sub>h</sub>) were manufactured in the presence of a magnetic field, <i>H</i> = 43 kA/m. The component <i>μ</i>″ of the complex effective magnetic permeability of all samples presents a maximum at a frequency, <i>f<sub>max</sub></i>, that moves to higher values by increasing <i>φ</i>, with this maximum being attributed to Brownian relaxation processes. The conductivity spectrum, <i>σ (f)</i>, of all samples follows the Jonscher universal law, which allows for both the determination of the static conductivity, <i>σ<sub>DC</sub></i>, and the barrier energy of the electrical conduction process, <i>W<sub>m</sub></i>. For the same <i>φ</i>, <i>W<sub>m</sub></i> is lower, and <i>σ<sub>DC</sub></i> is higher in the samples A<sub>h</sub>, B<sub>h</sub> and C<sub>h</sub> than in the samples A<sub>0</sub>, B<sub>0</sub> and C<sub>0</sub>. 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. |
| first_indexed | 2024-03-08T10:43:02Z |
| format | Article |
| id | doaj.art-2adb51f062e74a739610004e42227d3b |
| institution | Directory Open Access Journal |
| issn | 2312-7481 |
| language | English |
| last_indexed | 2024-03-08T10:43:02Z |
| publishDate | 2024-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Magnetochemistry |
| spelling | doaj.art-2adb51f062e74a739610004e42227d3b2024-01-26T17:25:21ZengMDPI AGMagnetochemistry2312-74812024-01-01101410.3390/magnetochemistry10010004The Effect of Magnetically Induced Local Structure and Volume Fraction on the Electromagnetic Properties of Elastomer Samples with Ferrofluid Droplet InsertsCatalin N. Marin0Iosif Malaescu1Department of Physics, West University of Timisoara, Bd. V. Parvan No. 4, 300223 Timisoara, RomaniaDepartment of Physics, West University of Timisoara, Bd. V. Parvan No. 4, 300223 Timisoara, RomaniaThe magnetic permeability (<i>μ</i>), dielectric permittivity (<i>ε</i>) and electrical conductivity (<i>σ</i>) of six elastomer samples obtained by mixing silicone rubber (RTV-530) with a kerosene-based ferrofluid in different volume fractions (<i>φ</i>), 1.31%, 2.59% and 3.84%, were determined using complex impedance measurements over a frequency range of <i>500</i> Hz–<i>2</i> MHz. Three samples (A<sub>0</sub>, B<sub>0</sub> and C<sub>0</sub>) were manufactured in the absence of a magnetic field, and the other three samples (A<sub>h</sub>, B<sub>h</sub> and C<sub>h</sub>) were manufactured in the presence of a magnetic field, <i>H</i> = 43 kA/m. The component <i>μ</i>″ of the complex effective magnetic permeability of all samples presents a maximum at a frequency, <i>f<sub>max</sub></i>, that moves to higher values by increasing <i>φ</i>, with this maximum being attributed to Brownian relaxation processes. The conductivity spectrum, <i>σ (f)</i>, of all samples follows the Jonscher universal law, which allows for both the determination of the static conductivity, <i>σ<sub>DC</sub></i>, and the barrier energy of the electrical conduction process, <i>W<sub>m</sub></i>. For the same <i>φ</i>, <i>W<sub>m</sub></i> is lower, and <i>σ<sub>DC</sub></i> is higher in the samples A<sub>h</sub>, B<sub>h</sub> and C<sub>h</sub> than in the samples A<sub>0</sub>, B<sub>0</sub> and C<sub>0</sub>. 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.https://www.mdpi.com/2312-7481/10/1/4elastomerferrofluidcomplex magnetic permeabilitycomplex dielectric permittivityelectrical conductivity |
| spellingShingle | Catalin N. Marin Iosif Malaescu The Effect of Magnetically Induced Local Structure and Volume Fraction on the Electromagnetic Properties of Elastomer Samples with Ferrofluid Droplet Inserts Magnetochemistry elastomer ferrofluid complex magnetic permeability complex dielectric permittivity electrical conductivity |
| title | The Effect of Magnetically Induced Local Structure and Volume Fraction on the Electromagnetic Properties of Elastomer Samples with Ferrofluid Droplet Inserts |
| title_full | The Effect of Magnetically Induced Local Structure and Volume Fraction on the Electromagnetic Properties of Elastomer Samples with Ferrofluid Droplet Inserts |
| title_fullStr | The Effect of Magnetically Induced Local Structure and Volume Fraction on the Electromagnetic Properties of Elastomer Samples with Ferrofluid Droplet Inserts |
| title_full_unstemmed | The Effect of Magnetically Induced Local Structure and Volume Fraction on the Electromagnetic Properties of Elastomer Samples with Ferrofluid Droplet Inserts |
| title_short | The Effect of Magnetically Induced Local Structure and Volume Fraction on the Electromagnetic Properties of Elastomer Samples with Ferrofluid Droplet Inserts |
| title_sort | effect of magnetically induced local structure and volume fraction on the electromagnetic properties of elastomer samples with ferrofluid droplet inserts |
| topic | elastomer ferrofluid complex magnetic permeability complex dielectric permittivity electrical conductivity |
| url | https://www.mdpi.com/2312-7481/10/1/4 |
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