Magnetic properties fluids

Separation depends on the selection of a process in which the behaviour of the material is influenced to a very marked degree by some physical property. Thus, if a material is to be separated into various size fractions, a sieving method may be used because this process depends primarily on the size of the particles, though other physical properties such as the shape of the particles and their tendency to agglomerate may also be involved. Other methods of separation depend on the differences in the behaviour of the particles in a moving fluid, and in this case the size and the density of the particles are the most important factors and shape is of secondary importance. Other processes make use of differences in electrical or magnetic properties of the materials or in their surface properties. 

Fig. 8.1.10 Schematic illustration of the apparatus for vapor-liquid reaction. (Reprinted from J Mag Mag. Mater, 122, Iron-nitride magnetic fluids prepared by vapor-liquid reaction and their magnetic properties, 1 Nakatani et al., pp 10-14. Copyrighi 1993. with permission from Elsevier Science.)...

Transition metal complexes have special properties, including colour and unusual magnetic properties that are useful in bioanalysis. Traditionally the most widespread technique for determining transition metals in physiological and biological fluids has been atomic absorption spectrophotometry. 

Magnetic fields can be effectively applied to retain insulating lubricating layers possessing magnetic properties within the friction zone. These include magnetic fluids and some fusible metals and alloys referred to as corrosion inhibitors. 

Polypyrrole nanocomposites with iron oxide and other nanoparticles have been prepared by several methods. For example, in situ chemical oxidative polymerization approach with either ultrasonication [59] or mechanical stirring [60] was reported. The nanocomposites showed particle-loading-dependent magnetic properties and electric conductivity. In addition, a supercritical fluid approach, implemented because of green chemistry, was also reported to be used as a medium in in situ chemical oxidative polymerization for the fabrication of conductive-polymer magnetic nanocomposites [61]. 

Moumen, N., Pileni, M.P New syntheses of cobalt ferrite particles in the range 2-5 nm comparison of the magnetic properties of the nanosized particles in dispersed fluid or in powder form. Chem. Mater. 8, 1128-1134 (1996)... 

Pileni, M.P. Magnetic fluids fabrication, magnetic properties, and oigtmization of nanocrystals. Adv. Funct. Maten 11,323-327 (2001)... 

M. P. Pileni, Magnetic fluids Fabrication, magnetic properties, and oiganization of nanocrystals,... 

Over ninety years ago, on November 8, 1845, Michael Faraday investigated the magnetic properties of dried blood and made a note Must tiy recent fluid blood. If he had determined the magnetic susceptibilities of arterial and Venous blood, he would have found them to differ by a large amount (as much as twenty per cent for completely oxygenated and completely deoxygenated blood) this discovery without doubt would have excited much interest and would have influenced appreciably the course of research on blood and hemoglobin. ... 

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