Synthesis and characterization of magnetite nanocrystals

Abstract

Nanocrystals of magnetite (Fe 3 O 4 ) were prepared by sol-gel technique. The prepared nanocrystals were characterized for phase by powder X-ray diffraction (XRD) of the samples annealed at successively higher temperature. The magnetite phase was formed during the annealing of the synthesized powder at 400 °C for a few hours. The Fourier transform infrared spectroscopy (FTIR) was performed to analyze the functional groups in the material. The energy dispersive X-ray diffraction (EDAX) was performed for chemical composition analysis. Scanning electron microscopy (SEM) and atomic force microscopy (AFM) techniques were used to analyze the morphology of nanocrystals and for estimating their average size. The results confirm the formation of Fe 3 O 4 nanocrystals of the sizes ~20-50 nm.

Microstructural Assessment of Magnetite Nanoparticles (Fe3O4) Obtained by Chemical Precipitation Under Different Synthesis Conditions

“…Magnetite nanoparticles preparation methods have been widely explored aiming to obtain different shapes (microspheres, nanospheres, nano-rods, etc), several sizes, great saturation magnetizations and elevated specific surface areas [8][9][10] . Chemical routes are favored to synthesize these nanoparticles with fine size distribution required for most applications, having a reproducible output and being less expensive, which favors their application in environmental field.…”

An experimental study on the synthesis of poly(vinyl pivalate)-based magnetic nanocomposites through suspension polymerization process

“…Magnetite may be synthetically prepared by several experimental techniques, such as precipitation from mixtures of ferric and ferrous ions in an alkaline medium, oxidation of ferrous ion from ferrous hydroxide solutions, interaction of ferrous ions with hydrated iron oxide solutions or decomposition of organic precursors. Although chemical coprecipitation methods are widely used to the synthesis of ferrites nanoparticles [2,3,[6][7][8][9][10], others important experimental techniques also deserve attention, such as hydrothermal [11,12], sonochemical [13,14], sol-gel [15,16], solvothermal [17][18][19], flow injection in tubular nanoreactors and electrochemical [20], aerosol [21] and precipitation from water-in-oil microemulsions [22].…”

Selenium speciation using capillary electrophoresis coupled with modified electrothermal atomic absorption spectrometry after selective extraction with 5-sulfosalicylic acid functionalized magnetic nanoparticles

“…Superparamagnetic iron oxide ( [19][20][21], and hemimicelles [22]. 65 Currently, syntheses of magnetic nanoparticles are mainly based on several 66 methods, including thermal decomposition, microemulsion, pyrolysis, hydrothermal 67 [23], sol−gel [24], and co-precipitation [25,26] methods. The disadvantage of thermal 68 decomposition methods is use of high temperature so that particles tend to aggregate, 69 producing larger particles.…”