Solvothermal synthesis of magnetic Fe_3O_4 microparticles via self-assembly of Fe_3O_4 nanoparticles  

作　　者：Wei Zhang Fenglei Shen Ruoyu Hong 

机构地区：[1]College of Chemistry, Chemical Engineering &Materials Science, and Key Laboratory of Organic Synthesis of Jiangsu Province, Soochow University, SIP, Suzhou 215123, China

出　　处：《Particuology》2011年第2期179-186,共8页颗粒学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (NSFC,nos.20876100 and 20736004);the National Basic Research Program of China (973 Program,no.2009CB219904);the State Key Lab of Multiphase Complex Systems of the Chinese Academy of Sciences (no.2006-5);the Key Lab of Organic Synthesis of Jiangsu Prov.;R&D Foundation of Nanjing Medical Univ.(NY0586);Post-doctoral Science Foundation of Jiangsu Prov.;National Post-doctoral Science Foundation (20090451176);the Commission of Science and Technology of Suzhou Municipality (YJS0917,SG0978);Technology Innovation Foundation of Suzhou New District and MOST;Minjiang Scholarship of Fujian Prov.

摘　　要：Ferromagnetic Fe3O4 nanoparticles were synthesized and then self-assembled into microparticles via a solvothermal method, using FeCI3.6H2O as the iron source, sodium oleate as the surfactant, and ethylene glycol as the reducing agent and solvent. The obtained Fe3O4 microparticles were characterized by X-ray powder diffraction （XRD）, X-ray photoelectron spectroscopy （XPS）, Raman spectroscopy and vibrating sample magnetometer （VSM）. The size and morphology of the particles were examined using transmis- sion electron microscopy （TEM） and scanning electron microscopy （SEM）. The Fe3O4 microparticles of nearly monodisperse diameters, controllable in the range of 120-400 nm, consist of assemblies of Fe3O4 nanoparticles with a diameter of 22 nm. The effects of reaction time, amount of surfactant and NaAc on the products were discussed. Interestingly, by using the pre-synthesized Fe3O4 microparticles as the growth substrates, spherical and smooth-looking Fe3O4 microparticles with average diameter of 1μm were obtained. A plausible formation process was discussed.Ferromagnetic Fe3O4 nanoparticles were synthesized and then self-assembled into microparticles via a solvothermal method, using FeCI3.6H2O as the iron source, sodium oleate as the surfactant, and ethylene glycol as the reducing agent and solvent. The obtained Fe3O4 microparticles were characterized by X-ray powder diffraction （XRD）, X-ray photoelectron spectroscopy （XPS）, Raman spectroscopy and vibrating sample magnetometer （VSM）. The size and morphology of the particles were examined using transmis- sion electron microscopy （TEM） and scanning electron microscopy （SEM）. The Fe3O4 microparticles of nearly monodisperse diameters, controllable in the range of 120-400 nm, consist of assemblies of Fe3O4 nanoparticles with a diameter of 22 nm. The effects of reaction time, amount of surfactant and NaAc on the products were discussed. Interestingly, by using the pre-synthesized Fe3O4 microparticles as the growth substrates, spherical and smooth-looking Fe3O4 microparticles with average diameter of 1μm were obtained. A plausible formation process was discussed.

关 键 词：Iron oxidesMagnetic microparticlesOriented attachmentSolvothermal method 

分 类 号：TQ423[化学工程] TB332[一般工业技术—材料科学与工程]