Structure and magnetic properties of nanostructured Ni-ferrite

CTAB-assisted hydrothermal synthesis of NiFe2O4 and its magnetic characterization

“…Ferrites have been synthesized by various methods such as solid-state reaction, co-precipitation, high-temperature selfpropagating, microemulsion, solvothermal, mechanosynthesis, hydrothermal, sol-gel and combustion techniques [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23]. The hydrothermal route is one of the most commonly used techniques owing to its economics and high degree of compositional control [24].…”

Catalytic oxidation of aqueous sulfide in the presence of ferrites (MFe2O4, M=Fe, Cu, Co)

“…After 1 h with a magnetic stirring (approximately 60 rpm) at room temperature (25 • C), it was added NaOH (3.5 M) until pH 8, the precipitate was filtered, washed with deionized water and acetone and dried at 70 • C for 24 h. The obtained powder was treated at 400 • C during 2 h in air to obtain the crystalline ferrite phases, following the procedures described in a previous study [24]. Magnetite was prepared by co-precipitation of Fe(III) and Fe(II) nitrates (Synth) using the same conditions.…”

“…Both materials showed similar magnetization curves suggesting the presence of supermagnetic materials (see Supplementary Material). These ferrites have been previously investigated in detail by Mössbauer spectroscopy[24,25].The synthesized samples showed similar surface areas, i.e. 75, 72, 100, 104 m 2 g −1 for Mt, Mh/Hm, CoFe 2 O 4 and CuFe 2 O 4 , respectively, obtained by nitrogen adsorption using the BET method.…”

Novel ferrofluids coated with a renewable material obtained from cashew nut shell liquid

“…Studies using the VSM indicate the different magnetic behavior related to the crystallinity of the nanoparticles (Albuquerque et al 2001). Fe 3 O 4 and NiFe 2 O 4 showed superparamagnetic characteristic behaviors due to no hysteresis in the magnetization curves with both remanence and coercivity being approximately zero.…”