Synthesis of CoFe2O4 nanoparticles embedded in a silica matrix by the citrate precursor technique |
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| Affiliation: | 1. School of Mechanical Engineering, Henan University of Engineering, Zhengzhou 451191, PR China;2. Department of Base of Railway and Public Security, Railway Police College, Zhengzhou 45000, PR China;3. School of Civil Engineering, Henan University of Engineering, Zhengzhou 451191, PR China;4. School of Chemical Engineering and Food Science, Zhengzhou Institute of Technology, Zhengzhou 450044, PR China;1. College of Chemistry, Jilin University, Changchun 130012, PR China;2. State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, PR China;1. Materials Science and Engineering Postgraduate Program, UFPB, 58051-900, João Pessoa, Brazil;2. Materials Science and Engineering Postgraduate Program, UFRN, 59078-970, Natal, Brazil;3. Centre for Mechanical Technology and Automation, Mechanical Engineering Department, University of Aveiro, Aveiro, 3810-193, Portugal;4. Department of Chemical Engineering, UFPB, 58051-900, Joao Pessoa, Brazil;5. Mechanical Engineering Postgraduate Program, UFPB, 58051-900, João Pessoa, Brazil;6. CICECO – Aveiro Institute of Materials, Department of Materials and Ceramic Engineering, University of Aveiro, 3810-193, Aveiro, Portugal;1. Crystal Growth and Thin Film Laboratory, Department of Physics, Bharathidasan University, Tiruchirappalli 620024, Tamil Nadu, India;2. Department of Physics and Nanotechnology, Faculty of Engineering and Technology, SRM University, Kattankulathur 603203, Tamil Nadu, India;3. Centre for Nanoscience and Technology, Anna University, Chennai 600025, Tamil Nadu, India |
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| Abstract: | ![]()
A metals–citrate–silica gel was prepared from metallic salts, citric acid and tetraethylorthosilicate by sol–gel method (citrate precursor technique) and it was further used to prepare magnetic nanocomposites. The gel was dried at 100 °C and then calcined at temperatures between 600 and 1000 °C to obtain powder samples. The nanocomposites were characterized by XRD, IR, VSM and TEM techniques. The diffraction patterns show the formation of a single magnetic phase identified as CoFe2O4. Magnetic nanoparticles with average size less than 50 nm were obtained which are well dispersed in the silica matrix. The combination of different metals concentrations and calcining temperatures allowed obtaining samples with magnetization ranging from 3.6 to 25.3 emu/g. |
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