TAILIEUCHUNG - Báo cáo hóa học: " Microwave assisted low temperature synthesis of MnZn ferrite nanoparticles"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Microwave assisted low temperature synthesis of MnZn ferrite nanoparticles | Nanoscale Res Lett 2007 2 40-43 DOI S11671-006-9027-3 NANO EXPRESS Microwave assisted low temperature synthesis of MnZn ferrite nanoparticles Lai Zhenyu Xu Guangliang Zheng Yalin Published online 18 November 2006 to the authors 2006 Abstract MnZnFe2O4 ferrite nanoparticles were prepared by co-precipitation method using a microwave heating system at temperature of 100 C. X-ray diffraction reveals the samples as prepared are pure ferrite nanocrystalline phase transmission electron microscopy image analysis shows particles are in agglomeration state with an average size of about 10 nm furthermore crystal size of samples are increased with longer microwave heating. Keywords MnZn ferrite Nanoparticles Microwave heating Introduction Ferrites with the spinel structure form a group of technologically important materials 1 . There are many methods for the preparation of ferrites including conventional ceramic method solid state reaction 2 3 co-precipitation method 4-6 hydrothermal method 7-9 high-energy ball milling method 10-12 micro-emulsion method 13-15 self-propagating high-temperature method 16 and sol-gel method 17 . Among these methods co-precipitation method appears to have attracted much attention for preparing ferrites nanoparticles. But particles prepared by co-precipitation method require heat treatment to get better crystalline so the process need long time L. Zhenyu El X. Guangliang Z. Yalin Key Laboratory of Advanced Building Materials of Sichuan Province Southwest university of Science and Technology Mianyang Sichuan 621010 . China e-mail laizy74@ consuming with bad quality control and easy chemical contamination. For these reasons we previously introduce ball-milling hydrothermal method 18 and microwave-hydrothermal 19-21 to reduce the processing time and energy cost and finally we found the crystallization of the spinel ferrites was promoted by the increase in reaction temperature and time. Microwave-assisted process is often found to be

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