Separation Process in Magnetic Fluids

Voelker, Troy A.; Blums, Elmars; Odenbach, S.

doi:10.1002/1617-7061(200203)1:1<321::aid-pamm321>3.0.co;2-v

Cited by 3 publications

(3 citation statements)

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“…Additionally, they proved that the bleaching is caused by thermophoretic migration of the absorbers out of the laser beam and not by a photo reaction. Within the accuracy of this simple model, their thermal diffusion coefficients agree well with the values obtained for similar ferrofluids in thermogravitational columns [93].…”

Section: Thermal Lens Methods and Soret Feedbacksupporting

confidence: 80%

Thermal diffusion in liquid mixtures and polymer solutions

Wiegand

2004

J. Phys.: Condens. Matter

285

296

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Thermodiffusion, also called thermal diffusion or the Ludwig–Soret effect, describes the coupling between a temperature gradient and a resulting mass flux in a multicomponent system. Although Ludwig and Soret discovered the effect in the 19th century, there is so far no molecular understanding of thermodiffusion in liquids. In the past decade the Ludwig–Soret effect has attracted growing interest due to improved experimental techniques, especially modern optical methods, which will be discussed and compared. On the basis of theoretical models, simulations and recent experiments we elucidate some properties and mechanisms contributing to the Soret effect.

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Section: Thermal Lens Methods and Soret Feedbacksupporting

confidence: 80%

Thermal diffusion in liquid mixtures and polymer solutions

Wiegand

2004

J. Phys.: Condens. Matter

285

296

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“…Approximate theories based on the concept of a slip velocity anticipate high positive values of Soret coefficient of lyophilized nanoparticles in surfacted colloids up to 10 À1 1/K [2,3]. The known experiments [4,5] agree well with that prediction. Comparing these results with theoretically calculated thermomagnetic mobility of particles, we can conclude that the effect of a magnetic field on summary Soret effect should be relatively low.…”

Section: Magnetic Soret Effectcontrasting

confidence: 41%

New transport properties of ferrocolloids: magnetic Soret effect and thermomagnetoosmosis

Blums

2005

Journal of Magnetism and Magnetic Materials

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“…The huge difference in size and mass between the particles of the solid phase and the molecules of the solvent makes for the strong thermodiffusive coupling and as a consequence relatively large concentration differences in nonisothermal ferrofluids. Depending on the structure of the particle-solvent interface and the composition of the liquid carrier, either normal or anomalous thermodiffusion can be observed [1,2].…”

Section: Introductionmentioning

confidence: 99%

Relaxation mechanisms of photoinduced periodic microstructures in ferrofluid layers

Zablotsky

Blums

2011

Phys. Rev. E

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We consider theoretically and numerically a periodic concentration grating induced in a layer of ferrofluid in the presence of the external magnetic field by nonuniform optical heating through photoabsorption. The stationary profiles of the periodic microstructures are governed by the equilibrium of the diffusive, thermodiffusive, and magnetic fluxes. The anisotropy of the diffusion coefficient and the magnetically driven microconvection contribute to the relaxation of these structures. The temperature-concentration coupling is shown to increase the initial effective diffusive relaxation rate by up to 50%. Microconvection dominates in the relaxation process even at small values of the control parameter and rapidly destroys the periodic part of the concentration grating. We describe this process in the weakly nonlinear regime by an approximate Galerkin model.

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Separation Process in Magnetic Fluids

Cited by 3 publications

References 0 publications

Thermal diffusion in liquid mixtures and polymer solutions

Thermal diffusion in liquid mixtures and polymer solutions

New transport properties of ferrocolloids: magnetic Soret effect and thermomagnetoosmosis

Relaxation mechanisms of photoinduced periodic microstructures in ferrofluid layers

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