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Magnetic Fluids

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Soft Matter".

Deadline for manuscript submissions: closed (20 November 2021) | Viewed by 10798

Special Issue Editor

Dr. Dmitry Borin

E-Mail Website
Guest Editor
Institute of Mechatronic Engineering, Technische Universität Dresden, Dresden, Germany
Interests: smart materials; magnetic composites; rheology

Special Issue Information

Dear colleagues,

Magnetic fluids have been at the focus of rigorous scientific studies for over half a century. Being complex systems with a set of unique physical properties controlled by a magnetic field, they attract the attention of researchers both from a fundamental and applied point of view. Recent trends in magnetic fluid research include interdisciplinary studies at the edge between biotechnology, medical applications, engineering and fundamental physics. At present, increasing attention is being paid to hybrid systems in which simple Newtonian carrier liquids are replaced by polymers, including biological media, liquid crystals, etc. Simple single-domain magnetic nanoparticles serving as the dispersed phase in classical magnetic fluids are replaced by complex clusters coated with various surfactants. Multidisperse mixtures of nano- and microparticles are also used. All this allows obtaining magnetic composites with advanced properties. New trends require novel approaches in theoretical and experimental studies of magnetic fluids. For this Special Issue, we would like to welcome original research manuscripts as well as methodological and review articles on the magnetic fluids on such topics as advances in synthesis, theoretical approaches, medical and biological applications, microstructural effects, rheology and magnetization, heat and mass transfer, and technical applications. This list is not restrictive, and studies on related topics are also welcome.

Dr. Dmitry Borin
Guest Editor

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Keywords

  • magnetic fluids
  • magnetic suspensions
  • ferrofluids
  • magnetic particles

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Published Papers (4 papers)

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Research

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10 pages, 857 KiB  
Article
Magnetoviscosity of a Magnetic Fluid Based on Barium Hexaferrite Nanoplates
by Dmitry Borin, Robert Müller and Stefan Odenbach
Materials 2021, 14(8), 1870; https://doi.org/10.3390/ma14081870 - 9 Apr 2021
Cited by 13 | Viewed by 1714
Abstract
This paper presents the results of an experimental study of the influence of an external magnetic field on the shear flow behaviour of a magnetic fluid based on barium hexaferrite nanoplates. With the use of rheometry, the magnetoviscosity and field-dependent yield-stress in the [...] Read more.
This paper presents the results of an experimental study of the influence of an external magnetic field on the shear flow behaviour of a magnetic fluid based on barium hexaferrite nanoplates. With the use of rheometry, the magnetoviscosity and field-dependent yield-stress in the fluid are evaluated. The observed fluid behaviour is compared to that of ferrofluids with magnetic nanoparticles having high dipole interaction. The results obtained supplement the so-far poorly studied topic of the influence of magnetic nanoparticles’ shape on magnetoviscous effects. It is concluded that the parameter determining the observed magnetoviscous effects in the fluid under study is the ratio V2/l3, where V is the volume of the nanoparticle and l is the size of the nanoparticle in the direction corresponding to its orientation in the externally applied magnetic field. Full article
(This article belongs to the Special Issue Magnetic Fluids)
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14 pages, 696 KiB  
Article
Meniscus of a Magnetic Fluid in the Field of a Current-Carrying Wire: Three-Dimensional Numerical Simulations
by Paul-Benjamin Eißman, Stefan Odenbach and Adrian Lange
Materials 2020, 13(3), 775; https://doi.org/10.3390/ma13030775 - 8 Feb 2020
Cited by 1 | Viewed by 2342
Abstract
Three-dimensional calculations of the meniscus of a magnetic fluid placed around a current carrying vertical and cylindrical wire are presented. Based on the material properties of experimentally used magnetic fluids, the numerically determined menisci are compared with the experimentally measured ones reported by [...] Read more.
Three-dimensional calculations of the meniscus of a magnetic fluid placed around a current carrying vertical and cylindrical wire are presented. Based on the material properties of experimentally used magnetic fluids, the numerically determined menisci are compared with the experimentally measured ones reported by May. The comparison is made for a linear law of magnetisation as well as for the experimentally measured nonlinear magnetisation curve. Up to moderate strengths of the applied current ( I < = 45 A), i.e., up to moderate strengths of the magnetic field close to the wire, the calculated profiles agree satisfyingly with the experimentally measured ones for a linear as well as for a nonlinear law of magnetisation. At a great strength of the applied current ( I = 70 A), i.e., at a large strength of the magnetic field close to the wire, the agreement is less good than in the range up to moderate strengths. Our analysis revealed that the numerically assumed isothermal conditions are not present in the experiment, particularly at the great strength of the applied current. A control of the temperature in the experiment and the implementation of a coupled thermal model in the numerics are considered the most relevant future steps for an improved agreement. Full article
(This article belongs to the Special Issue Magnetic Fluids)
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15 pages, 9637 KiB  
Article
Experimental Investigations on the Effect of Axial Homogenous Magnetic Fields on Propagating Vortex Flow in the Taylor–Couette System
by Thomas Ilzig, Katharina Stöckel and Stefan Odenbach
Materials 2019, 12(24), 4027; https://doi.org/10.3390/ma12244027 - 4 Dec 2019
Cited by 7 | Viewed by 2542
Abstract
Experimental investigations of propagating vortex flow states (pV states) in a short Taylor–Couette system with asymmetric boundary conditions are presented. The flow state was established in a ferrofluid showing no magneto-viscous effect and was exposed to axial magnetic fields. It was [...] Read more.
Experimental investigations of propagating vortex flow states (pV states) in a short Taylor–Couette system with asymmetric boundary conditions are presented. The flow state was established in a ferrofluid showing no magneto-viscous effect and was exposed to axial magnetic fields. It was found that the magnetic field led to a change in the spatial and temporal behavior of the pV state, indicating complex interactions between the flow field and magnetic field. A stepwise applied axial magnetic field destabilized the pV state, leading to an intermittent flow state. Gradually increasing the axial magnetic fields changed the temporal behavior of the regime. Up to magnetic field strengths of 20 kA/m, the orbital frequency, as a measure for the temporal periodicity, was increased with field strength. Full article
(This article belongs to the Special Issue Magnetic Fluids)
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Review

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25 pages, 6263 KiB  
Review
Chain Formation and Phase Separation in Ferrofluids: The Influence on Viscous Properties
by Alexey O. Ivanov and Andrey Zubarev
Materials 2020, 13(18), 3956; https://doi.org/10.3390/ma13183956 - 7 Sep 2020
Cited by 39 | Viewed by 3290
Abstract
Ferrofluids have attracted considerable interest from researchers and engineers due to their rich set of unique physical properties that are valuable for many industrial and biomedical applications. Many phenomena and features of ferrofluids’ behavior are determined by internal structural transformations in the ensembles [...] Read more.
Ferrofluids have attracted considerable interest from researchers and engineers due to their rich set of unique physical properties that are valuable for many industrial and biomedical applications. Many phenomena and features of ferrofluids’ behavior are determined by internal structural transformations in the ensembles of particles, which occur due to the magnetic interaction between the particles. An applied magnetic field induces formations, such as linear chains and bulk columns, that become elongated along the field. In turn, these structures dramatically change the rheological and other physical properties of these fluids. A deep and clear understanding of the main features and laws of the transformations is necessary for the understanding and explanation of the macroscopic properties and behavior of ferrofluids. In this paper, we present an overview of experimental and theoretical works on the internal transformations in these systems, as well as on the effect of the internal structures on the rheological effects in the fluids. Full article
(This article belongs to the Special Issue Magnetic Fluids)
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