Characterization of radiolytically synthesized feroxyhyte and oxidized magnetite nanoparticles

Rheological, Microstructural and Thermal Properties of Magnetic Poly(Ethylene Oxide)/Iron Oxide Nanocomposite Hydrogels Synthesized Using a One-Step Gamma-Irradiation Method

“…Figure 5 shows the Mössbauer spectra recorded at 77 K of nanocomposite gels obtained from suspensions with 2-propanol at 130 kGy and 300 kGy. Generally, the Mössbauer spectrometry is very sensitive to the presence of Fe(II) in inorganic [ 25 , 36 ] and biological samples [ 37 ]. The sample 5% Fe 3+ at 130 kGy ( Figure 5 a) consisted of a symmetric doublet which was fitted with quadrupole splitting distribution.…”

Superparamagnetic cobalt ferrite nanoparticles synthesized by gamma irradiation

“…The one pot radiolytic method has been successfully used for reduction into metal nanoparticles, 23 and more recently, for the reduction of trivalent hydroxides into Me 3 O 4 . 27–31…”

“…The one pot radiolytic method has been successfully used for reduction into metal nanoparticles, 23 and more recently, for the reduction of trivalent hydroxides into Me 3 O 4 . [27][28][29][30][31] Cobalt ferrite is a mixed oxide of trivalent iron and divalent cobalt ions. To synthesize these ions in an intimate mixture, our approach is to oxidize first, under aerated basic conditions (NH 4 OH), the cobalt ions from Co II to Co III in a solution containing Co II and Fe III .…”

“…In addition, the pulse radiolysis technique offers the possibility of studying in real time the different growth steps of the metal. 28,29 Recently, the radiolytic route has been used for the synthesis of monodisperse small and MNPs of iron oxide Fe 3 O 4 , [30][31][32] manganese oxide Mn 3 O 4 , 33,34 cobalt oxide Co 3 O 4 , 35 and cobalt hydroxide a-Co(OH) 2 . 36 However, mixed cobalt and iron oxide CoFe 2 O 4 (or cobalt ferrite) has not yet been synthesized by the radiolytic method.…”

“…All chemical reagents were of high grade and purity from Sigma-Aldrich.General procedure for radiation-induced synthesis. Analogous to the radiolytic synthesis of iron oxide Fe3O4, [27][28][29][30][31] this method was also used to prepare cobalt ferrite nanoparticles. Because of their high energy, the radiation penetrates throughout the precursor solution, and, under selective conditions, generates from water, at room temperature and without any added chemical agent, strongly reducing species that are homogeneously distributed.…”