TAILIEUCHUNG - Study on some factors of magnetic fluid chitosancoated fe3o4 nanoparticles fabrication via hydrothermal method
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. | Journal of Science and Technology 54 (2C) (2016) 341-347 STUDY ON SOME FACTORS OF MAGNETIC FLUID CHITOSANCOATED Fe3O4 NANOPARTICLES FABRICATION VIA HYDROTHERMAL METHOD Le The Tam1, Nguyen Hoa Du1, *, Tran Dai Lam2, Phan Thi Hong Tuyet1, Le Thi Nhan1 1 Faculty of Chemistry, Vinh University, 182 Le Duan, Vinh, Nghe An 2 Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Ha Noi * Email: Received: 15 June 2016; Accepted for publication: 23 October 2016 ABSTRACT 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 ± nm and saturation magnetization emu/g at room temperature were obtained under the hydrothermal temperature 165oC, heating time 2 h 55 minute and ferric salt concentration .
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