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 and Properties of e-Fe3N-Based Magnetic Fluid | Nanoscale Res Lett 2008 3 260-264 DOI s11671-008-9148-y NANO EXPRESS Preparation and Properties of 8-Fe3N-Based Magnetic Fluid Wei Huang Xiaolei Wang Received 17 May 2008 Accepted 11 July 2008 Published online 25 July 2008 to the authors 2008 Abstract In this work e-Fe3N nanoparticles and e-Fe3N-based magnetic fluid were synthesized by chemical reaction of iron carbonyl and ammonia gas. The size of 8-Fe3N nanoparticles was tested by TEM and XRD. Stable 8-Fe3N-based magnetic fluid was prepared by controlling the proper ratio of carrier liquid and surfactant. The saturation magnetization of stable 8-Fe3N-based magnetic fluid was calculated according to the volume fraction of the particles in the fluid. The result shows that both the calculated and measured magnetizations increase by increasing the particle concentration. With the increasing concentration of the 8-Fe3N particles the measured value of the magnetic fluid magnetization gradually departs from the calculated magnetization which was caused by agglomeration affects due to large volume fraction and large particle size. Keywords Iron nitrides Magnetic fluids X-ray diffraction Magnetic properties Introduction Magnetic fluids or ferrofluids are comprised of magnetic nanoparticles stabilized by coating surfactants and dispersed in various media most notably hydrocarbons esters W. Huang El X. Wang Jiangsu Key Laboratory of Precision Micro-manufacturing Technology Nanjing University of Aeronautics Astronautics Nanjing 210016 China e-mail 5543837@ W. Huang Department of Functional Material Research Central Iron Steel Research Institute Beijing 100081 People s Republic of China or water 1-5 . The stability of magnetic fluid depends upon a balance between repulsive and attractive interactions among nanoparticles 6 . Besides the thermal motion the steric and electrostatic repulsive interactions are against Van der Waals and dipolar attractive interactions 7 . The magnetic properties of magnetic fluids .
