Magnetic separation principles

An interesting recent review focuses on immunoassays that employ amperomet-ric array elements that have been coupled with magnetic separation principles [8]. Magnetic beads are suitably modified and used as a readily separated solid phase for antibody-antigen reactions, and electrodes modified with bioaffinity ligands provide array element-specific interactions and detection that, when individually addressed, allow the acquisition of unique signals for different analytes present in mixtures. 

In the case of Co—Cr having perpendicular anisotropy there is, in principle, a competition between the uniaxial anisotropy of a hexagonal stmcture and the demagnetizing energy of the thin film. In the case of magnetically separated Co—Cr columns (particulate morphology) then also the shape anisotropy contributes to the perpendicular anisotropy. 

J. A. Oberteuffer, Magnetic Separation M Kevieiv of Principles, Devices and Applications, Institute of Electrical and Electronics Engineers, Inc., 1977. P. A. Cliermemnykli and I. V. Kurchatov, IEEE Trans. Magnetics, 28(1), 651—658 (Jan. 1992). 

Cross-belt magnetic separators are based on the same principle as lifting magnets. Although these units have relatively low capacities, the same unit can produce selective separations with different products by using different pole gaps and field strengths. (See Fig. 19-42.)... 

Eriez, Magnetics Europe Ltd., Eddy Current Separators, Principle and Practice , Brochure No SB 501 UK, p. 1. 

Electro-magnetic separation is the only method by which the isotopes of an element can be completely separated from one another. The separation is carried out by the mass spectrograph which works on the principle elaborated earlier for the mass spectrometer (Chapter 13). Working of the Dempster s mass spectrograph diagramatically represented by Figure 19.4, illustrates the basics of electromagnetic separation of isotopes. 

In beach and mineral sand plants as well as in taconite processing plants, minerals have magnetic properties. The presence of a magnet would attract the ferrous ores and separate them from other solids. This is the principle of magnetic separation. Magnetic separators... 

For extraction of harmful components monolayer or bilayer covered particles can be used Aqueous magnetic fluids, stabilized by bilayers of hydrocarbons can solve organic molecules, i.e. benzene or chloroform within their layers. During this process the particles flocculate and can be magnetically separated. In principle the separated particles can be recycled after separation of the adsorbed organic molecules, i.e., by distillation. 

The principle of magnetic separation of biomolecules, (a) Flow carrying magnetic microbeads, (b) immobilization of the magnetic microbeads. 

Figure 3.86 Principle of high gradient magnetic separation...

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