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Magnetochemistry
Special Issues
Ferrofluids - Electromagnetic Properties and Applications
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Ferrofluids - Electromagnetic Properties and Applications

A special issue of Magnetochemistry (ISSN 2312-7481). This special issue belongs to the section "Magnetic Materials".

Deadline for manuscript submissions: closed (31 May 2023) | Viewed by 5223

Special Issue Editor

Dr. Catalin Nicolae Marin

E-Mail Website
Guest Editor
Faculty of Physics, West University of Timisoara, 300223 Timisoara, Romania
Interests: electromagnetic properties of nanoparticles; ferrofluids; ferromagnetic resonance; dielectric permittivity; magnetic permeability; electromagnetic absorbers; magnetic hyperthermia; magnetic materials; dielectric materials
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Ferrofluids, also known as magnetic fluids, were invented in the early 1960s by Steve Papell, engineer at the Lewis Research Center, to be used for rockets in the form of magnetic fuel, which can be magnetically directed from the storage tank to the engine in the absence of gravity. Since then, ferrofluids have been studied both for application purposes and for fundamental research. Because ferrofluids are relatively easy to obtain, with different carrier liquids, different surfactants, and different magnetic particles at different concentrations, they have also been a study material for understanding the electrical and magnetic properties of magnetic nanoparticle systems.

This Special Issue aims to publish articles on both the theory and electromagnetic applications of ferrofluids and of composites or structures realized with ferrofluids.

Prof. Dr. Catalin Nicolae Marin
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Magnetochemistry is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2200 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • magnetic fluids
  • Ferrofluids
  • static and dynamic magnetic measurements magnetic hyperthermia
  • stability of magnetic colloids
  • structures and assambling of magnetic nanoparticles
  • technical and biomedical applications of ferrofluids and of other nanoparticle systems
  • magneto-optical phenomena in ferrofluids
  • magneto-dielectric effects in magnetic colloids and composites
  • use of electrical and magnetic measurements to characterize materials
  • ferrofluid-based nanostructured materials
  • ferrofluid structures and devices

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Published Papers (3 papers)

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Research

15 pages, 3616 KiB  
Article
Polarizing Magnetic Field Effect on Some Electrical Properties of a Ferrofluid in Microwave Field
by Catalin N. Marin, Paul C. Fannin and Iosif Malaescu
Magnetochemistry 2024, 10(11), 88; https://doi.org/10.3390/magnetochemistry10110088 - 9 Nov 2024
Viewed by 704
Abstract
The complex dielectric permittivity, ε (f, H) = ε′ (f, H) − i ε″ (f, H), in the microwave frequency range f, of (0.1–3) GHz and polarizing field values H, [...] Read more.
The complex dielectric permittivity, ε (f, H) = ε′ (f, H) − i ε″ (f, H), in the microwave frequency range f, of (0.1–3) GHz and polarizing field values H, in the range of (0–135) kA/m, was measured for a kerosene-based ferrofluid with magnetite particles. A relaxation process attributed to interfacial type relaxation was highlighted, determining for the first time in the microwave field, the activation energy of the dielectric relaxation process in the presence of the magnetic field, EA(H), in relation to the activation energy in zero field, EA(H = 0). Based on the complex permittivity measurements and the Claussius–Mossotti equation, the dependencies on frequency (f), and magnetic field (H), of the polarizability (α) and electrical conductivity (σ), were determined. From the dependence of α(f,H), the electric dipolar moment, p, of the particles in the ferrofluid, was determined. The conductivity spectrum, σ(f,H), was found to be in agreement with Jonscher’s universal law and the electrical conduction mechanism in the ferrofluid was explained using both Mott’s VRH (variable range hopping) model and CBH (correlated barrier hopping) model. Based on these models and conductivity measurements, the hopping distance, Rh, of the charge carriers and the maximum barrier height, Wm, for the investigated ferrofluid was determined for the first time in the microwave field. Knowledge of these electrical properties of the ferrofluid in the microwave field is useful for explaining the mechanisms of polarization and control of electrical conductivity with an external magnetic field, in order to use ferrofluids in various technological applications in microwave field. Full article
(This article belongs to the Special Issue Ferrofluids - Electromagnetic Properties and Applications)
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13 pages, 4431 KiB  
Article
Investigation of Ferrofluid Sessile Droplet Tensile Deformation in a Uniform Magnetic Field
by Gui-Ping Zhu, Shi-Hua Wu, Shu-Ze Zheng, Lai Li and Nam-Trung Nguyen
Magnetochemistry 2023, 9(10), 215; https://doi.org/10.3390/magnetochemistry9100215 - 30 Sep 2023
Cited by 1 | Viewed by 1561
Abstract
A significant growth of research on digital microfluidics has been achieved over the past several decades, and the field is still attracting increasing attention for fulfilling relevant mechanisms and potential applications. Numerous studies have been devoted to actively manipulating droplets in a variety [...] Read more.
A significant growth of research on digital microfluidics has been achieved over the past several decades, and the field is still attracting increasing attention for fulfilling relevant mechanisms and potential applications. Numerous studies have been devoted to actively manipulating droplets in a variety of fundamental and applicational scenarios. In this work, the deformation of ferromagnetic fluid droplets is studied under an external uniform magnetic field. The droplets are precisely dispersed on the bottom surface of a container assembled with polymer methacrylate (PMMA) plates. Mineral oil is applied instead of air as the surrounding medium for easy stretching and preventing water solvent evaporation in ferrofluid. The design and processing of the container are firstly carried out to observe the shape and characterize the wettability of the droplets in the immiscible mineral oil medium. Furthermore, the droplets’ deformation and the working mechanism are given under the action of the horizontal uniform magnetic field. At different magnetic field intensities, the droplet is stretched in the horizontal direction parallel to the applied field. Due to volume conservation, the dimension in the height reduces correspondingly. With the coupling effect of magnetic force, viscous force and interfacial tension, the contact angle first increases with the magnetic field and then basically remains unchanged upon magnetization saturation. Consistent with the experimental results, the numerical method clearly reveals the field coupling mechanism and the nonlinear deformation of the sessile droplet. Full article
(This article belongs to the Special Issue Ferrofluids - Electromagnetic Properties and Applications)
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14 pages, 4513 KiB  
Article
Exploring the Polarization of Light in Ferrofluids with Mueller Matrices
by Alberto Tufaile and Adriana Pedrosa Biscaia Tufaile
Magnetochemistry 2022, 8(10), 121; https://doi.org/10.3390/magnetochemistry8100121 - 7 Oct 2022
Cited by 1 | Viewed by 2069
Abstract
We studied the polarization of light in a thin film of ferrofluid subjected to a magnetic field using the Mueller matrix formalism. By observing the results of some experiments, we relate the observed light patterns with Stokes vectors that can be operated by [...] Read more.
We studied the polarization of light in a thin film of ferrofluid subjected to a magnetic field using the Mueller matrix formalism. By observing the results of some experiments, we relate the observed light patterns with Stokes vectors that can be operated by Mueller matrices, which represent the magnetic field applied to the sample. We observed that the changes in the dichroism of this system can be monitored along the sample, allowing for the visualization of magneto-optical effects mainly for linear polarized light, and the effects of circular polarized light are related to birefringence. Full article
(This article belongs to the Special Issue Ferrofluids - Electromagnetic Properties and Applications)
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