High gradient magnetic separation

Oberteuffer, J. A.

doi:10.1109/tmag.1973.1067673

Cited by 160 publications

(55 citation statements)

References 6 publications

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“…In particular, the final magnetic separation step must be improved and adapted to the separation of nanoparticles. The High Gradient Magnetic Separation (HGMS) technique seems the most suitable to date and has already shown spectacular results in medical applications with the separation of magnetite nanoparticle fractions from each other (Oberteuffer, 1973;Kelland et al, 1975;Kelland, 1998).…”

Section: Toward An Integrated Steel Slag Valorization Chainmentioning

confidence: 99%

Hydrothermal Steel Slag Valorization—Part II: Hydrogen and Nano-Magnetite Production

et al. 2017

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The effect of acidic conditions (in a pH range of 3 to 6) and temperature on the kinetics of the hydrothermal oxidation of ferrous iron contained in BOF steel slag has been tested in the 150-350 • C range for acid acetic concentrations from 0 to 4 M. Reaction progress was monitored with the amount of produced H 2 . Higher temperature and lower pH are found to enhance the hydrothermal oxidation kinetics of the slag. These two parameters are believed to increase iron dissolution rate which has already been identified as the rate limiting step of the hydrothermal oxidation of pure FeO. An activation energy of 28 ± 4 kJ/mole is found for the hydrothermal oxidation of the steel slag which compares very well with that of pure FeO under similar conditions. In the case of the slag run in water at 300 • C for 70.5 h, magnetite product has been separated magnetically and characterized. Particles were found to fall in three size ranges: 10-30 nm, 100-300 nm, and 1-10 µm. The smallest fraction (10-30 nm) is comparable to the 10-20 nm size range that is achieved when nanomagnetite are synthesized by co-precipitation methods. Obviously, the production of nanomagnetite enhances the economic interest of the hydrothermal processing of steel slags, which has already proven its capacity to produce high-purity H 2 .

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Section: Toward An Integrated Steel Slag Valorization Chainmentioning

confidence: 99%

Hydrothermal Steel Slag Valorization—Part II: Hydrogen and Nano-Magnetite Production

et al. 2017

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“…This charge relaxation time t is deÞned as the time needed to discharge a particle to a charge level of 37% of the initial charge q 0 [19]. It is calculated from (3) as (4) where e and r are the relative permittivity and the electric resistivity ( W m) of the surrounding media, respectively.…”

Section: P Article C Hargingmentioning

confidence: 99%

“…As an example, [3] demonstrates the use of magnetic Þelds to manipulate Þne magnetic particles. High-gradient magnetic separation makes even the effective handling of very weakly magnetic micron-sized particles possible [4]. The advantage lies in the property-oriented separation of particles into magnetic and non-magnetic groups.…”

mentioning

confidence: 99%

<title>Contactless manipulation of microparts by electric field traps</title>

Moesner¹,

Higuchi

1998

SPIE Proceedings

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“…In HGMS, a matrix of thin filaments or spheres of ferromagnetic material is placed in a strong homogeneous magnetic field. With this technique, magnetic field gradients of up to 100 T/cm can be created at the surface of the matrix [2]. Early work on generic HGMS systems [3,4] eventually led to the development of the MACS HGMS system [5].…”

Section: Introductionmentioning

confidence: 99%

Buffer-Optimized High Gradient Magnetic Separation: Target Cell Capture Efficiency is Predicted by Linear Bead-Capture Theory

Waseem¹,

Udomsangpetch²,

Bhakdi³

2016

Journal of Magnetics

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High gradient magnetic separation (HGMS) is the most commonly used magnetic cell separation technique in biomedical science. However, parameters determining target cell capture efficiencies in HGMS are still not well understood. This limitation leads to loss of information and resources. The present study develops a beadcapture theory to predict capture efficiencies in HGMS. The theory is tested with CD3-and CD14-positive cells in combination with paramagnetic beads of different sizes and a generic immunomagnetic separation system. Data depict a linear relationship between normalized capture efficiency and the bead concentration. In addition, it is shown that key biological functions of target cells are not affected for all bead sizes and concentrations used. In summary, linear bead-capture theory predicts capture efficiency (E t ) in a highly significant manner.

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High gradient magnetic separation

Cited by 160 publications

References 6 publications

Hydrothermal Steel Slag Valorization—Part II: Hydrogen and Nano-Magnetite Production

Hydrothermal Steel Slag Valorization—Part II: Hydrogen and Nano-Magnetite Production

<title>Contactless manipulation of microparts by electric field traps</title>

Buffer-Optimized High Gradient Magnetic Separation: Target Cell Capture Efficiency is Predicted by Linear Bead-Capture Theory

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