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Two types of superparamagnetic nanoparticles, namely magnetite (Fe3O4) and iron-platinum (FePt), with their surface modified by oleic acid and oleyleamine were synthesized using the the polyol process and dispersed in n-hexane. Vibrating-sample magnetometry (VSM) was used to characterize the FePt and the magnetic susceptibility of the Fe3O4 was measured as a function of magnetic field and frequency at room temperature. Synchrotron, small-angle, X-ray scattering (SAXS) patterns revealed the polydispersity of the magnetic nanoparticles with average radii below 5 nm. As confirmed by transmission electron microscopy (TEM) images and dynamic light scattering (DLS), the Fe3O4 nanoparticles had a larger average size. The DLS measurement gave larger radii than those obtained from the SAXS because of the effect of aggregates and surfactants. Dve vrsti superparamagnetnih nanodelcev, magnetit (Fe3O4) in železo-platina (FePt), s površino, modificirano z oleinsko kislino in oleinaminom, sta bili sintetizirani s polyolnim postopkom in dispergirani v n-heksanu. Vibracijska magnetometrija vzorcev (VSM) je bila uporabljena za karakterizacijo FePt in magnetna občutljivost Fe3O4 je bila izmerjena pri sobni temperaturi kot funkcija magnetnega polja in frekvence. Sinhrotronsko malokotno sipanje rentgenskih žarkov (SAXS) je odkrilo polidisperznost magnetnih nanodelcev s povprečnim premerom, manjšim od 5 nm. Kot so potrdili posnetki s transmisijsko elektronsko mikroskopijo (TEM) in dinamičnim sipanjem svetlobe (DLS), imajo nanodelci Fe3O4 večjo povprečno velikost. Meritve DLS so pokazale večje premere delcev kot meritve SAXS zaradi učinka združevanja delcev in tenzidov. |
