STUDY ON SOME FACTORS OF MAGNETIC FLUID CHITOSANCOATED Fe3O4 NANOPARTICLES FABRICATION VIA HYDROTHERMAL METHOD
Keywords:synthesis, MNPs, Fe3O4, chitosan, hydrothermal, optimization, design of experiments (DOE), response surface methodology (RSM).
To optimize reaction conditions of hydrothermal preparation of crystalline magnetite
(Fe3O4) nanoparticles, the influence of some experimental parameters (temperature, initial
concentration of ferric and ferrous ions, and heating time), and their interactions on the magnetic
nanoparticle formation was studied using response surface methodology (RSM), based on a
statistical design of experiments (DOE). The variation in the particle diameter and crystallite
size of obtained magnetic nanoparticles (MNPs) with the synthesis conditions was examined and
transmission electron microscopy (TEM) and X-ray diffraction analysis. The results showed that
crystallite size was greatly affected by temperature, ferric salt concentration and the heating
time, whereas the particle diameter strongly depended on the heating time, and on the interaction
between the initial ferrous/ferric ion molar ratio and the initial concentration of ferrous ions. The
MNPs produced by this method were the objects to coat surface with chitosan solution. The
chitosan coated MNPs are nearly spherical with a mean size from 10 to 20 nm depending on the
experimental conditions. RSM analysis showed that under optimized conditions, the chitosan
coated MNPs with smallest size 13.43 ± 1.5 nm and saturation magnetization 68.12 emu/g at
room temperature were obtained under the hydrothermal temperature 165oC, heating time 2 h 55
minute and ferric salt concentration 0.21 M.
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