Ferromagnetic nanoparticles

Magnetic resonance in an assembly of ferromagnetic nanoparticles in ferrofluids, glasses and other systems has attracted much attention. But, up to now, only a few attempts have been made of quantitative, computer-simulation based analysis of SPR spectra of magnetic nanoparticles dispersed in glassy systems [2-11]. 

In general, microgels obtained by radiation methods can be used in various applications in the same way as conventional synthesized systems, e.g., as drug delivery templates, for encapsulation, or as microreactors [29, 30], PAAm for example can be used as template material to synthesize hollow cadmium selenide nanospheres [24], and PVP can be used for the incorporation of ferromagnetic nanoparticles to obtain magnetic hydrogel microspheres [13],... 

Peculiarities of Electron Magnetic Resonance Spectra of the Linear Aggregates OF Ferromagnetic Nanoparticles... 

The electric properties of soft ferromagnetic nanoparticles in an insulating matrix strongly depend on the concentration of a metallic filler x and are varied between properties of the matrix and those of the filler. In binary nanocomposites a critical concentration (percolation threshold Xq) is reached when a continuous current-conducting cluster of the filler particles is formed through out the sample. 

Kita E, Oda T, Kayano T, Sato S, Minagawa M, Yanagihara H, Kishimoto M, Mitsu-mata C, Hashimoto S, Yamada K, Ohkohchi N. Ferromagnetic nanoparticles for magnetic hyperthermia and thermoablation therapy. Journal of Physics D Applied Physics. 2010 43 474011(1)-474011(9). DOI 10.1088/0022-3727/43/47/474011. 

A ferrofluid is a liquid consisting of ferromagnetic nanoparticles suspended in a nonmagnetic carrier fluid, typically water or oil. The ferromagnetic nanoparticles are coated with a surfactant such as oleic acid to prevent their agglomeration. The magnetic particles have typical diameters on the order of 5-15 nm and a volume fraction of about 5-10 %. 

Yang D et al (2012) Electromagnetic activation of a shape memory copolymer matrix incorporating ferromagnetic nanoparticles. Polym Int 61(1) 38 2... 

If these reactions are carried out in the presence of polymers, it is the simplest and apparently the most widespread method for the introduction of large (sometimes up to 90 wt%) quantities of colloidal particles of pine metals into polymeric compositions. This method underhes numerous processes intended for the preparation of polymer-immobilized ferromagnetic nanoparticles via the chemisorption of macromolecules on metal particles formed in situ. This is pertinent to the thermolysis of metal carbonyls. 

---