tailieunhanh - Báo cáo hóa học: " Magnesium Ferrite (MgFe2O4) Nanostructures Fabricated by Electrospinning"

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: Magnesium Ferrite (MgFe2O4) Nanostructures Fabricated by Electrospinning | Nanoscale Res Lett 2009 4 221-228 DOI s11671-008-9229-y NANO EXPRESS Magnesium Ferrite MgFe2O4 Nanostructures Fabricated by Electrospinning Santi Maensiri Montana Sangmanee Amporn Wiengmoon Received 14 August 2008 Accepted 2 December 2008 Published online 16 December 2008 to the authors 2008 Abstract Magnesium ferrite MgFe2O4 nanostructures were successfully fabricated by electrospinning method. X-ray diffraction FT-IR scanning electron microscopy and transmission electron microscopy revealed that calcination of the as-spun MgFe2O4 poly vinyl pyrrolidone PVP composite nanofibers at 500-800 C in air for 2 h resulted in well-developed spinel MgFe2O4 nanostuctures. The crystal structure and morphology of the nanofibers were influenced by the calcination temperature. Crystallite size of the nanoparticles contained in nanofibers increased from 15 4 to 24 3 nm when calcination temperature was increased from 500 to 800 C. Room temperature magnetization results showed a ferromagnetic behavior of the calcined MgFe2O4 PVP composite nanofibers having their specific saturation magnetization Ms values of and emu g at 10 Oe for the samples calcined at 500 600 700 and 800 C respectively. It is found that the increase in the tendency of Ms is consistent with the enhancement of crystallinity and the values of Ms for the MgFe2O4 samples were observed to increase with increasing crystallite size. S. Maensiri M. Sangmanee Department of Physics Faculty of Science Small Strong Materials Group SSMG Khon Kaen University Khon Kaen 40002 Thailand S. Maensiri El M. Sangmanee Integrated Nanotechnology Research Center INRC Faculty of Science Khon Kaen University Khon Kaen 40002 Thailand e-mail sanmae@ santimaensiri@ A. Wiengmoon Department of Physics Faculty of Science Naresuan University Phitsanulok 65000 Thailand Keywords Magnesium ferrite Nanofibers Electrospinning Electron microscopy X-ray diffraction Magnetic properties Nanofabrication .