Polymer-covered magnetic particles

Polymer-covered magnetic particles can also be produced by the precipitation in situ of magnetic materials in the presence of polymer which acts as a stabiHzer. In this way, magnetic polymer nanoparticles are produced in presence of the water-soluble dextran [110], poly(ethylene imine) [111], poly(vinyl alcohol) [112], poly(ethylene glycol) [113], sodium poly(oxyalkylene di-phosphonates) [114], and amylose starch [115]. 

Chiriac, H. Simionescu, B.C. (2009), Glyddoxypropylsilane-functionalized magnetite as precursor for polymer-covered core-shell magnetic particles. High Perform. Polym., 21 548-561. 

Plasma is effective in the fabrication of nanocomposites, such as nanoparticles composed of one material and covered by a nanolayer of another. Relevant examples include, in particular, carbon-coated magnetic metal particles produced in thermal arc plasma (McHenry et al., 1994), as well as polymer-coated nanoparticles with improved adhesion, corrosion resistance, and surface passivation produced in RF plasma in a fluidized bed (Shi et al.,... 

The dependence of the specific magnetization of magnetite particles without polymer coating (a) with a cover (b and c). Weight of polymer coating (b)—10%, (c)—50% of the total mass of the sample. 

In most of the applications the surface functionality of the magnetic nanoparticles needs to be controlled. The covering of the nanoparticles for instance with polymers protects the nanoparticles of degradation and oxidation that usually conduct to a loss of properties. The modification of the surface by the attachment of stabilizing molecules or compatibilizers is t) pically carried out to avoid the undesirable agglomeration of the particles and also favoring the stabilization and... 

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