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Magnetite (Fe3O4) nanoparticles have been synthesized by sol-gel method combined with annealing under vacuum, without use of surfactants and using precursors like FeCl3??6H2O, ethanol and propylene epoxide and using several annealing temperatures and different annealing time. The approach is straightforward, inexpensive and versatile. The annealing process, the phase structures, morphologies, particle...
Amorphous Fe73.5Si13.5B9Nb3Cu1 alloy was prepared by the chill block melt-spinning process and nanocrystalline alloy was obtained by annealing. The crystallization behavior was analysed by DSC, XRD and TEM. The electrochemical corrosion behaviors in different annealed states were performed by linear polarization method and electrochemical impedance spectroscopy in 1 mol/L HCl solution. The results...
In this paper, we prepared the magnetite nanoparticles coated with polyethlenimine, (CH2-CH2-NH)n with the coprecipitation method. X-ray diffraction (XRD) and Transmission Electron Microscope (TEM) methods were used to analyze their phase and size; The groups adhered on the surface were observed by Fourier transform infrared spectroscopy(FTIR); adsorption rate of the PEI was got by thermogravimetric...
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