Technical Applications

Bayat, Nayim; Nethe, A.; Guldbakke, Jan Magnus; Hesselbach, Jürgen; Налетова, В.А.; Stahlmann, H. D.; Uhlmann, Eckart; Zimmermann, Klaus

doi:10.1007/978-3-540-85387-9_6

Cited by 7 publications

(6 citation statements)

References 18 publications

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“…They may thus be confined, displaced, deformed, and controlled. These unique and striking features make them suited for a large number of applications in quite a diverse range of fields from engineering 1 to biomedicals. 2,3 Biological applications basically require nanoparticles functionalized with biological effectors to make them interact with or bind to biological targets.…”

Section: Introductionmentioning

confidence: 99%

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Structural, Chemical, and Magnetic Investigations of Core–Shell Zinc Ferrite Nanoparticles

et al. 2012

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We investigate here the internal structure of zinc ferrite nanoparticles designed and prepared by a soft chemistry method to elaborate magnetic nanocolloids. The strategy used to avoid acid dissolution modifies the chemical composition of the surface of the nanoparticles, which are described as a core of stoichiometric zinc ferrite surrounded by a maghemite shell. Measurements of X-ray absorption nearedge spectroscopy, extended X-ray absorption fine structure, and X-ray diffraction are undertaken to investigate the local structure of nontreated nanocrystals and of surface-treated ones as a function of their sizes. The qualitative analysis of X-ray absorption results indicates a nonequilibrium cation distribution among the interstitial sites of the zinc ferrite nanocrystals core. Ab-initio calculations of theoretical photoelectron backscattering phases and amplitudes give, by fitting Fourier transformed EXAFS data at both Zn and Fe K-edges, an average inversion degree of 0.34. This value well matches the result of Rietveld refinement of X-ray diffraction data. Magnetization measurements performed on dilute aqueous nanocrystal dispersions, liquid at room temperature and frozen at low temperatures, are carried out in order to test the obtained results.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Structural, Chemical, and Magnetic Investigations of Core–Shell Zinc Ferrite Nanoparticles

et al. 2012

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“…Another example includes magnetofluidic dampers in which the oscillatory magnetic field is used to control the viscosity of a ferrofluid inside a damper (cf. Bayat et al 2009). …”

Section: Introductionmentioning

confidence: 93%

Short-time self-diffusion, collective diffusion and effective viscosity of dilute hard sphere magnetic suspensions

Mizerski

Wajnryb

2016

J. Fluid Mech.

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The virial corrections to short-time self-and collective diffusion coefficients as well as the effective viscosity are calculated for suspensions of hard spheres with the same radii and constant (blocked within the particle) magnetization modelled by a point dipole. Analytic, integral formulae derived from basic principles of statistical mechanics are provided for both cases -in the absence and in the presence of an external magnetic field. In the former case the diffusion and viscosity coefficients are evaluated numerically as a function of the strength of magnetic interactions between the particles and it is reported that the translational collective diffusion coefficient is significantly greater than all the other coefficients. In the presence of an external magnetic field the coefficients become anisotropic and are evaluated in the asymptotic regime of weak interparticle magnetic interactions.

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“…The planar ferrofluid bearing can be seen as a sort of hydrostatic bearing meaning that it does not need a relative movement between bearing faces to create a pressure field. Though the working principles are fundamentally different from the hydrostatic bearings of literature [22][23][24][25] that uses the magnetorheological effect and a pressure source to create a pressure field.…”

Section: Introductionmentioning

confidence: 99%

Load and stiffness of a planar ferrofluid pocket bearing

Lampaert

Spronck

Ostayen

2017

Proceedings of the Institution of Mechanical Engineers, Part J:

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A ferrofluid pocket bearings is a type of hydrostatic bearing that uses a ferrofluid seal to encapsulate a pocket of air to carry a load. Their properties, combining a high stiffness with low (viscous) friction and absence of stick-slip, make them interesting for applications that require fast and high precision positioning. Knowledge on the exact performance of these types of bearings is up to now not available. This article presents a method to model the load carrying capacity and normal stiffness characteristics of this type of bearings. Required for this is the geometry of the bearing, the shape of the magnetic field and the magnetization strength of the fluid. This method is experimentally validated and is shown to be correct for describing the load and stiffness characteristics of any fixed shape of ferrofluid pocket bearing.

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Technical Applications

Cited by 7 publications

References 18 publications

Structural, Chemical, and Magnetic Investigations of Core–Shell Zinc Ferrite Nanoparticles

Structural, Chemical, and Magnetic Investigations of Core–Shell Zinc Ferrite Nanoparticles

Short-time self-diffusion, collective diffusion and effective viscosity of dilute hard sphere magnetic suspensions

Load and stiffness of a planar ferrofluid pocket bearing

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