Abstract
Surface modified Fe2O3 nanoparticles were successfully synthesized via different thermal treatment of the Fe(OH)3 precursor, which was obtained by the extraction-precipitation system. The Fe3+ ions were extracted into hexane by the extractant first, then the extracted solution containing Fe(III) complex was precipitated with NaOH solution. The obtained Fe(OH)3 precursor was given different thermal treatment, such as solvothermal reaction, an intense refluxing boiling tetralin and calcine at air, respectively. The obtained Fe2O3 nanoparticles were characterized by XRD, TEM, SEM, IR, UV-vis, and TG-DTG, respectively. The results showed that Fe2O3 products were well modified by extractant, which could be well dispersed into organic solvents to form the stable fluids.
Acknowledgements
This work was financially supported by the foundation of Ph.D. subjects 2005, P. R. China (No. 20050426003) and the Key Laboratory Foundation of Eco-Chemical Engineering of Qingdao University of Science and Technology (No. KLECE 2007-001). The authors thank Cytec Canada, Inc. for its kindly supplying the extractant of Cyanex 301.