Electrosynthesis of Cobalt Ferrite nanoparticles in the presence of external magnetic field

سال انتشار: 1398
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 313

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شناسه ملی سند علمی:

ICCO02_026

تاریخ نمایه سازی: 3 اردیبهشت 1399

چکیده مقاله:

Magnetic complex oxides of iron nanoparticles are among the most important magnetic materials that have been studied, because they have been widely used in different areas such as electronic devices, information storage, and also in biomedicine areas and drug-delivery technology [1]. For many applications, the synthesis of uniformly sized nanoparticles is important, because the electrical, optical and magnetic properties depend strongly on the dimensions of the nanoparticles [2]. Various preparation methods, such as sol–gel, mechanical milling, hydrothermal, solvothermal, micelles, thermolysis and coprecipitation have been used to produce CoFe2O4 nanoparticles. Although these methods have been improved in the last decade, they were in very small or coarse particles with a wide size distribution or non-stoichiometric ferrites where the Co is not properly located in the structure [3]. In this study, uniform size cobalt ferrite nanoparticles have been synthesized during electrochemical technique. The anode was made previously, by depositing metallic cobalt on the iron in the solution of 0.1 M Co(NO3)2 as precursor. Then the electrosynthesis of cobalt ferrite was performed in a second electrochemical cell with prepared anode and stainless steel (316L) cathode with 6cm2 active surface area in the solution of 0.04M CTAB. The current density was optimized in 25 A/cm-3. The same synthesis was made in the presence of a magnetic field supplied by using two parallel magnets of 0.44 T rectangular cubes of (5 cm*5 cm*2 cm) dimensions of NdFeB magnets, arranged perpendicular to the surface of electrodes, which superimpose magnetic field of 220 mT measured using Gaussmeter 425 Lake Shore. The nanoparticles have been characterized by X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Energy Dispersive X-Ray Analysis (EDX), and the magnetic properties were investigated by Vibrating Sample Magnetometer (VSM). The XRD pattern showed that the CoFe2O4 obtained presents a totally inverse spinel structure. The comparison of two samples prepared in the presence of a magnetic field and without it, showed the average size of the synthesized samples in the presence of the magnetic field was in narrower size distribution of 20-30 nm. EDX analysis showed the weight percentage of Cobalt was increased from 1.1% to 11.9%. The saturation magnetization of the nanoparticles at room temperature decreased from 70.2 to 11.3 emu/g in the presence of the magnetic field. That is because of the substitution of the cobalt oxide to the iron oxide in the ferrite.

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نویسندگان

Juliet Ordoukhanian

Department of Chemistry, Payame Noor University, Tehran, Iran

Shahla Mozaffari

Department of Chemistry, Payame Noor University, Tehran, Iran

Zeynab AmirAtashani

Department of Chemistry, Payame Noor University, Tehran, Iran