Perfect truncated octahedral magnetite crystals were successfully synthesized from FeCl3.6H2O and poly（acrylic acid） （PAA） in an alkaline ethylene glycol solution via a mild one-step solvothermal process. The stru...Perfect truncated octahedral magnetite crystals were successfully synthesized from FeCl3.6H2O and poly（acrylic acid） （PAA） in an alkaline ethylene glycol solution via a mild one-step solvothermal process. The structure and morphologies of the obtained products were characterized by powder X-ray diffraction （XRD）, Raman spectroscopy, scanning electron microscopy （SEM）, and transmission electron microscopy （TEM）. The effects of synthetic parameters including reaction temperature, reaction time, and the amount of alkali on the morphological evolution of the truncated octahedral magnetite crystals were systematically explored. 160℃ was found to be the optimum temperature for the formation of truncated octahedral magnetite crystals. Below 160 ℃, little magnetite was formed. Above 160℃, the truncated octahedrons were gradually transformed into irregular-shaped polyhedrons. Alkali is indispensable in promoting the formation of magnetite at mild temperatures. The truncated octahedral magnetite crystals were found to be ferromagnetic and had a saturation magnetization of about 83 emu/g.展开更多
基金Support from the Ministry of Science and Technology of China (2013CB834505)the National Natural Science Foundation of China (21201172,20901081,51172245,91127005)+5 种基金the Knowledge Innovation Project of the Chinese Academy of Sciences(KGCX2EW-311-3)the Beijing Natural Science Foundation(2112042, The Photodegradation of Organic Dye Pollutants in Waste Water Using Metal/Semi-conductor Nanocomposite Visible-light Photocatalysts)the 100 Talents Program of the Chinese Academy of Sciencesthe Scientific Research Foundation for Returned Scholars of Ministry of Education of Chinathe Open Project Program of the State Key Laboratory of Inorganic Synthesis and Preparative Chemistry,Jilin University(2011-05)the Open Project Program of State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University(201105)
文摘Perfect truncated octahedral magnetite crystals were successfully synthesized from FeCl3.6H2O and poly（acrylic acid） （PAA） in an alkaline ethylene glycol solution via a mild one-step solvothermal process. The structure and morphologies of the obtained products were characterized by powder X-ray diffraction （XRD）, Raman spectroscopy, scanning electron microscopy （SEM）, and transmission electron microscopy （TEM）. The effects of synthetic parameters including reaction temperature, reaction time, and the amount of alkali on the morphological evolution of the truncated octahedral magnetite crystals were systematically explored. 160℃ was found to be the optimum temperature for the formation of truncated octahedral magnetite crystals. Below 160 ℃, little magnetite was formed. Above 160℃, the truncated octahedrons were gradually transformed into irregular-shaped polyhedrons. Alkali is indispensable in promoting the formation of magnetite at mild temperatures. The truncated octahedral magnetite crystals were found to be ferromagnetic and had a saturation magnetization of about 83 emu/g.
