Core–shell and multilayered magnetite nanoparticles—Structural and Mössbauer studies

Stability of core–shell nanowires in selected model solutions

“…Spectra collected in panel D show mainly signals which are typical for compounds present in wine and were already observed in our previous studies [20]. Here we do observe signals from Fe-O (∼600 cm −1 ) [29,30] of iron oxide because wires are significantly damaged by that solution (which is also confirmed by XRD). Moreover, signals at 790 cm −1 are present because of C-O-C bonds in esters.…”

Magnetic nanoparticles of core–shell structure

“…In Fig. 6C, signals at 720-790 cm -1 can also be observed due to the presence of carbon chains [9]. Described spectra are almost the same in each case of the layer variation.…”

“…The layered ferrite nanoparticles were fabricated by the modified procedure developed firstly by S. Sun [10,22] and adopted to the requested conditions [9]. The seeds of magnetic particles were prepared by mixing respectively 4 or 8 mmol of Fe(acac) 3 and proper amounts of oleic acid, oleyl amine, diphenyl ether and 1,2-hexadecanediol.…”

“…1-octadecanol and oleyl amine were obtained from Fluka. Purification of the solution and size separation of resultant nanoparticles were realized with the use of pure acetone, sonication bath and permanent magnet [9]. IR spectra were collected by Nicolet 6700 infrared spectrometer working in a reflection mode in the range 400-4000 cm -1 .…”

“…Such targeting experiments can help to find out how uniform the magnetic layer structure is in the whole volume of the particle. We have already observed that magnetic properties of nanoparticles are strongly modified by the surface layer [9] and the modification is related to the used elements [10,11].…”