Colloidal magnetic fluids: A special case of magnetic anisotropy

Kód výsledku v IS VaVaI

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Colloidal magnetic fluids: A special case of magnetic anisotropy

Popis výsledku v původním jazyce

Magnetic fluids (thus nanacomposite magnetic material) represent relatively innovative and perspective material for many industrial applications. Recent rapid development of nanotechnologies allowed production of magnetic fluids with wide range of required physical and chemical properties. One of characteristic attributes of magnetic fluids is the significant change of their physical properties in dependence on the application of the external magnetic field. In technical practice, the change of viscosity of these fluids is most commonly used, but other physical properties (e.g., magnetic permeability and dielectric permittivity) change as well.Magnetic fluids are significantly non linear and strongly anisotropic medium. This must be respected when designing different applications by the use of special mathematical apparatus. From the electromagnetic field point of view, the characteristic parameter of the magnetic fluid is the tensor of the magnetic permeability/dielectric perrnittivity. Presented work describes and innovate method of determination elements of this tensor by measurement carried out on the sample of magnetic fluid. Further, the mathematic-physical properties of magnetic fluid as the medium with and orthogonal anisotropy during the time-varying magnetization are examined. Dissipative phenomena manifesting themselves as energy losses, which significantly impact the design of various electrical appliances, are then discussed. Moreover, new levitation phenomena in magnetic fluids are discussed. The possibility to levitate bodies in magnetic liquid can lead to significant practical applications. Several examples of perspective technical applications of magnetic liquids are presented as well. Three examples are discussed more in detail: controlled torsion damper for application in transportation, next ferrofluid controlled capacitor for application in sensor techno]ogy and peristaltic pump that takes advantage of magneto-elastic properties and shows some significant advantages compared to classical pumps design.

Název v anglickém jazyce

Colloidal magnetic fluids: A special case of magnetic anisotropy

Popis výsledku anglicky

Magnetic fluids (thus nanacomposite magnetic material) represent relatively innovative and perspective material for many industrial applications. Recent rapid development of nanotechnologies allowed production of magnetic fluids with wide range of required physical and chemical properties. One of characteristic attributes of magnetic fluids is the significant change of their physical properties in dependence on the application of the external magnetic field. In technical practice, the change of viscosity of these fluids is most commonly used, but other physical properties (e.g., magnetic permeability and dielectric permittivity) change as well.Magnetic fluids are significantly non linear and strongly anisotropic medium. This must be respected when designing different applications by the use of special mathematical apparatus. From the electromagnetic field point of view, the characteristic parameter of the magnetic fluid is the tensor of the magnetic permeability/dielectric perrnittivity. Presented work describes and innovate method of determination elements of this tensor by measurement carried out on the sample of magnetic fluid. Further, the mathematic-physical properties of magnetic fluid as the medium with and orthogonal anisotropy during the time-varying magnetization are examined. Dissipative phenomena manifesting themselves as energy losses, which significantly impact the design of various electrical appliances, are then discussed. Moreover, new levitation phenomena in magnetic fluids are discussed. The possibility to levitate bodies in magnetic liquid can lead to significant practical applications. Several examples of perspective technical applications of magnetic liquids are presented as well. Three examples are discussed more in detail: controlled torsion damper for application in transportation, next ferrofluid controlled capacitor for application in sensor techno]ogy and peristaltic pump that takes advantage of magneto-elastic properties and shows some significant advantages compared to classical pumps design.

Druh

C - Kapitola v odborné knize

CEP obor

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OECD FORD obor

20201 - Electrical and electronic engineering

Projekt

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Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2020

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název knihy nebo sborníku

A Closer Look at Magnetic Anisotropy

ISBN

978-1-5361-7566-0

Počet stran výsledku

51

Strana od-do

89-139

Počet stran knihy

146

Název nakladatele

Nova Science Publishers

Místo vydání

New York

Kód UT WoS kapitoly

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