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: Preparation of Monodisperse Iron Oxide Nanoparticles via the Synthesis and Decomposition of Iron Fatty Acid Complexes | Nanoscale Res Lett 2009 4 1343-1350 DOI s11671-009-9403-x NANO EXPRESS Preparation of Monodisperse Iron Oxide Nanoparticles via the Synthesis and Decomposition of Iron Fatty Acid Complexes Chih-Jung Chen Hsin-Yi Lai Chee-Cheng Lin Jiun-Shen Wang Ray-Kuang Chiang Received 23 April 2009 Accepted 17 July 2009 Published online 30 July 2009 to the authors 2009 Abstract Iron fatty acid complexes IFACs are prepared via the dissolution of porous hematite powder in hot unsaturated fatty acid. The IFACs are then decomposed in five different organic solvents under reflux conditions in the presence of the respective fatty acid. The XRD analysis results indicate that the resulting NPs comprise a mixture of wustite magnetite and maghemite phases. The solvents with a higher boiling point prompt the formation of larger NPs containing wustite as the major component while those with a lower boiling point produce smaller NPs with maghemite as the major component. In addition it is shown that unstable NPs with a mixed wustite-magnetite composition can be oxidized to pure maghemite by extending the reaction time or using an oxidizing agent. Keywords Iron fatty acid complexes Iron oxide Magnetic nanoparticles Monodisperse Introduction Many studies have shown that long-chain carboxylates or soaps of polyvalent metal ions are effective precursors for . Chen . Lai Department of Mechanical Engineering National Cheng Kung University Tainan 701 Taiwan ROC . Chen . Lin . Chiang H Nanomaterials Laboratory Far East University Hsing-Shih Tainan County 74448 Taiwan ROC e-mail . Wang Department of Power Mechanical Engineering National Taitung Junior College Taitung County 95045 Taiwan ROC the large-scale synthesis of metal oxide or metal nanoparticles NP via a thermal decomposition process utilizing organic solvents 1-8 . Of these various soaps those containing iron have attracted particular attention due to the magnetic properties bestowed in
