Magnetic composites

Laboratory analysis of flush water indicates that some non-magnetic iron oxide may also be retained by the EMF. The non-magnctic iron removal is believed to be due to the presence of magnetic/noii-magnetic composite particles, which are magnetically attracted by the filter. 

Technology. A Simple Preparation of Magnetic Composites for the Adsorption of Water Contaminants, J. Chem. Educ. 2004, 81, 248-250. 

Keywords Anisotropic elastomers Ferrogels Magnetic composites ... 

Both carbonyl iron and iron oxide particles were dispersed in the Elas-tosil 604 A. After mixing it with the Elastosil 604 B component, the solution was transferred into a cube-shaped mould. The cross-linking reaction was carried out at ambient temperature for 4.5 h to obtain the magnetic composites. After cross-linking polymerization, the cubed, cylindrical, and spherical samples were removed from the moulds [77,78]. 

Due to the magneto-rheological effect, the resulting magnetic composite becomes anisotropic in terms of mechanical and magnetic properties. One can easily vary the direction of the particle chains by the direction of the applied magnetic field, as shown in Fig. 6. 

Elastic Properties of Magnetic Composites Studied by Unidirectional Compression... 

Changes in molecular conformation can accumulate and lead to shape changes (Fig. 27). The magnetic field drives and controls the displacement, and the final shape is set by the balance of magnetic and elastic interactions. The force density,/m, on a piece of magnetic composite can be written as ... 

Lei H, Chen L, Li X et al. (2004) The preparation of catalytically active papain immobilized on magnetic composite microspheres. Enzyme Microb Technol 35 15-21 Lioy E, Suarez J, Guzman F et al. (2001) Synthesis, biologictil, tind immunologictil properties of cyclic peptides from Plasmodium falciparum merozoite surface protein-1. Angewtind Chem Intemat Ed 40(14) 2631-2635... 

Determination of the tensor allows us to describe anisotropic optical properties of the composites. In particular, for magnetic composites the effective value of the MO parameter Q, which plays an important role in the magnetooptics, can be evaluated. The definition of the parameter Q is given in the next section. 

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