چكيده به لاتين
Zinc ferrite nanoparticles have been prepared by solution combustion synthesis method, using Diethylenetriaminepentaacetic Acid, Ethylenediaminetetraacetic Acid, Oxalic Acid and Citric Acid as fuel and Glycol, Wood fiber, Polyurethane foam and Sterile gas, in order to investigate the effect of salt on the size of the crystals and the surface morphology of the particles, Potassium Bromide, Potassium Chloride, Sodium Chloride and Sodium Nitrate were used. In this research, Glycol, Wood fiber, Polyurethane foam, Potassium Bromide and Sodium Nitrate salts were used for the first time in the combustion synthesis of zinc ferrite. In order to reduce and optimize the number of tests, Taguchi's L16 test design method was used. Five main parameters include the main fuel type, the molar ratio of salt to oxidizer, the type of mold, the type of salt, and the ratio of fuel to oxidizer. Based on the prediction of Taguchi's statistical design, a sample was selected as the optimal sample to make it from oxalic acid as a fuel with a ratio to oxidizer equal to stoichiometry and wood fiber as a template, and to investigate the effect of salt, with the same conditions and factors. Potassium bromide, potassium chloride, sodium chloride and sodium nitrate salts were used with a molar ratio of salt to oxidizer of 0.1, which resulted in the formation of nanoparticles with the average crystal size of 14.76, 18.83, 13.93 and 25.10 nm and the sample with sodium chloride salt, which has the highest melting point among other salts, is the optimal sample. Based on the prediction of Taguchi's design, the crystal size of the optimal sample was 13.25 nm, which is the error percentage of the report is 5.13. Also, a sample was prepared with the same conditions as the optimal sample and potassium bromide salt with a molar ratio of salt to oxidizer of 0.75, and the average crystal size of the sample was 26.36 nm, which showed that increasing the amount of salt is not as good as its low amount. In this study, the synthesized nanoparticles were analyzed by standard X-ray diffraction (XRD), field emission scanning electron microscope (FESEM), nitrogen absorption and desorption apparatus (BET), vibrating sample magnetometer (VSM) and Fourier transform infrared spectroscopy (FTIR) were characterized. The results of the X-ray diffraction pattern showed the average size of the crystals between 13.93 and 46.80 nm. The surface area and pore diameter are individually 38.18 square meters per gram and 6.95 nm with specific surface area measurement analysis. Examining the magnetometer of the vibrating sample showed the superparamagnetic nature of the prepared sample with an average magnetic value, which is 20.61 emu/g saturation magnetization.
