Synthesis of magnetite (Fe۳O۴) nano particles via precipitation method andstudy of their stability in water media

In the present work, magnetite nano particles were synthesized by precipitation method in thepresence of polyoxyethilen (۸۰), sorbitan monoleate (Tween ۸۰), surface modifier under N۲atmosphere, using Iron (II) chloride (FeCl۲) and Iron (III) chloride (FeCl۳) as starting materials.Then samples were dispersed in water media to investigate the stability. Structure, microstructure, magnetic and optical properties were studied using X-ray diffraction (XRD), scanningelectron microscopy (SEM), vibrating sample magnetometer (VSM), UV-Vis spectrometrytechniques. Results showed that synthesis in the presence of surface modifier increased theuniformity of spherical nano magnetite particles. Moreover, VSM results at room temperatureshowed that the samples were superparamagnet without hysteresis loop. Band gap of sampleswere estimated as ۲.۸ eV which was ۰.۱ eV, larger than for bulk samples. Nano particles weresynthesized in the presence of ۰.۵ g/l Tween ۸۰ showed the best stability in aqueous media.

Keywords:

Fe۳O۴ , magnetic nano fluid , precipitation , surface modifier , stability