An overview of separation by magnetically stabilized beds: State-of-the-art and potential applications

Hristov, Jordan; Fachikov, L.

doi:10.1016/j.cpart.2007.01.010

Cited by 43 publications

(19 citation statements)

References 64 publications

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“…Magnetic separation could be conducted in a batch mode or in continuous flow. An overview of separation by magnetically stabilized beds is proposed by Hristov and Fachikov [21]. The recent review of Ambashta and Sillanpaa [22] brings out a series of information about water purification technique using magnetic assistance.…”

Section: Introductionmentioning

confidence: 98%

Magnetic alginate beads for Pb(II) ions removal from wastewater

Bée

Talbot

Abramson

et al. 2011

Journal of Colloid and Interface Science

143

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Section: Introductionmentioning

confidence: 98%

Magnetic alginate beads for Pb(II) ions removal from wastewater

Bée

Talbot

Abramson

et al. 2011

Journal of Colloid and Interface Science

143

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“…Magnetic stabilization of fluidized beds has been proposed for aerosol and liquid filtration because of its potential for continuous particulate removal [13,14]. A complete review about the potential applications of magnetically stabilized beds as filtering devices can be checked in [15]. While fixed-bed filters provide in general high collection efficiency, the progressive increase of the pressure drop across the bed due to clogging with the collected aerosol particles eventually drives to an inevitable downtime for regeneration or replacement.…”

Section: Introductionmentioning

confidence: 98%

The yield stress of jammed magnetofluidized beds

2012

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By means of a magnetic field externally imposed, fluidized beds of magnetizable particles may experience a transition from a fluidlike unstable to a solidlike stable state. In our work, measurements have been taken of the gas velocity and particle volume fraction at the jamming transition as well as of the tensile yield stress of the stabilized bed subjected to a small consolidation. The influence of diverse physical parameters such as initialization mode, magnetic field orientation, average particle size and size polydispersion, are analyzed. Noninvasive visualization of the bed structure has revealed that magnetic stabilization is determined by the formation of particle chains. Due to the enhancement of the interparticle attractive force with field strength and particle size, the transition to stability takes place at higher gas velocities as the magnitude of these parameters is increased. The magnetic yield stress of magnetofluidized beds of naturally aggregated particles because of a large presence of fines is significantly larger than that corresponding to naturally nonaggregated particles. Moreover, the jamming transition occurs at larger gas velocities (or smaller field strengths) in the former case since the agglomerates behave magnetically as large effective particles. The effect of the magnetic field on the yield stress ia only relevant when it is applied during

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“…The magnetic character implies that they respond to a magnet, making sampling and collection easier and faster, but their magnetization disappears once the magnetic field is removed. In addition, magnetic beads promise to solve many of the problems associated with chromatographic separations in packed bed and in conventional fluidized bed systems (21,22). Advantages of magnetic columns include the efficient fluid-solid mass transfer properties, low-pressure drop, good fluid-solid contact, elimination of clogging, and continuous countercurrent operation (23).…”

Section: Introductionmentioning

confidence: 99%

Silane-Modified Magnetic Beads: Application to Immunoglobulin G Separation

et al. 2007

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The magnetic poly(2-hydroxyethyl methacrylate ethylene glycol dimethacrylate) [m-poly(HEMA-EGDMA)] beads (150-250-microm diameter in spherical form) were prepared by a radical suspension polymerization technique. The pseudo-specific ligand, reactive imidazole containing 3-(2-imidazoline-1-yl)propyl (triethoxysilane) (IMEO) was selected as a silanization agent. IMEO was covalently immobilized onto the magnetic beads. IMEO-immobilized m-poly(HEMA-EGDMA) beads were used for the affinity adsorption of immunoglobulin-G (IgG) from aqueous solutions and human plasma. To evaluate the degree of IMEO attachment, the m-poly(HEMA-EGDMA) beads were subjected to Si analysis by using flame atomizer atomic absorption spectrometer, and it was estimated as 36.6 mg IMEO/g of polymer. The nonspecific IgG adsorption onto the plain m-poly(HEMA-EGDMA) beads was very low (about 0.4 mg/g). Higher adsorption values (up to 55 mg/g) were obtained when the m-poly(HEMA-EGDMA)/IMEO beads were used from both aqueous solutions and human plasma. The maximum IgG adsorption on the m-poly(HEMA-EGDMA)-IMEO beads was observed at pH 7.0. The IgG molecules could be repeatedly adsorbed and desorbed with m-poly(HEMA-EGDMA)-IMEO beads without noticeable loss in the IgG adsorption capacity. The adsorption capacity from human plasma in magnetically stabilized fluidized bed decreased drastically from 78.9 to 19.6 mg/g with the increase of the flow rate from 0.2 to 3.5 mL/min.

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An overview of separation by magnetically stabilized beds: State-of-the-art and potential applications

Cited by 43 publications

References 64 publications

Magnetic alginate beads for Pb(II) ions removal from wastewater

Magnetic alginate beads for Pb(II) ions removal from wastewater

The yield stress of jammed magnetofluidized beds

Silane-Modified Magnetic Beads: Application to Immunoglobulin G Separation

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