Gas phase synthesis of core-shell Fe@FeOx magnetic nanoparticles into fluids

AKTAS, SITKI/0000-0002-9143-6752; Binns, Chris/0000-0003-1711-375XWOS: 000389896600003Sorbitol, short chain molecules, have been used to stabilise of Fe@FeOx nanoparticles produced in the gas phase under the ultra-high vacuum (UHV) conditions. The sorbitol coated Fe@FeOx nanoparticles produced by our method have a narrow size distribution with a hydrodynamic diameter of 35 nm after NaOH is added to the solution. Magnetisation measurement shows that the magnetic nanoparticles are superparamagnetic at 100 K and demonstrate hysteresis at 5 K with an anisotropy constant of 5.31 x 10(4) J/m(3) (similar to bulk iron). Also, it is shown that sorbitol is only suitable for stabilising the Fe@FeOx suspensions, and it does not prevent further oxidation of the metallic Fe core. According to MRI measurement, the nanoparticles have a high transverse relaxation rate of 425 mM(-1) s(-1).EnSol Norway (Norwegian Research Council (NRC)) [239750]; Republic of Turkey Ministry of National EducationMinistry of National Education - TurkeyThis study was funded by EnSol Norway (Norwegian Research Council (NRC) project number: 239750). Additionally, Sitki Aktas was supported by the Republic of Turkey Ministry of National Education