TAILIEUCHUNG - Báo cáo " Effects of the conditions of the microemulsion preparation on the properties of Fe3O4 nanoparticles "

Fe3O4 nanoparticles have been prepared by the microemulsion technique with water as the aqueous phase, n-hexane as the oil phase and Span 80 as the surfactant. The reaction occurred under air, N2 or high temperature and high pressure atmosphere. Particle size can be controlled by the concentration of the reactants dissolved in water, the ratio of water/surfactant and the atmospheric conditions. | VNU Journal of Science Natural Sciences and Technology 24 2008 9-15 Effects of the conditions of the microemulsion preparation on the properties of Fe3O4 nanoparticles Nguyen Thai Ha1 Nguyen Hoang Hai1 Nguyen Hoang Luong1 Nguyen Chau1 Huynh Dang Chinh2 1 Center for Materials Science Faculty of Physics College of Science VNU 334 Nguyen Trai Hanoi Vietnam 2 Faculty of Chemical Technology Hanoi University of Technology 1 Dai Co Viet Hanoi Vietnam Received 12 March 2008 Abstract. Fe3O4 nanoparticles have been prepared by the microemulsion technique with water as the aqueous phase n-hexane as the oil phase and Span 80 as the surfactant. The reaction occurred under air N2 or high temperature and high pressure atmosphere. Particle size can be controlled by the concentration of the reactants dissolved in water the ratio of water surfactant and the atmospheric conditions. The particle size is of 6 - 20 nm. They are superparamagnetic with the saturation magnetization of 50 emu g. Functionalization of the particle surface has been carried out by using a single layer of oleic acid for hydrophilic surface and double layer of oleic acid and sodium dodecyl sulfate for hydrophilic surface to disperse them in non-aqueous and aqueous solvents respectively. Changing the conditions of the preparation affected to the properties of the product. This technique showed advantages such as simple small size particles monodisperse over the coprecipitation methods. Keywords Magnetite nanoparticles microemulsion superparamagnetic Fe3O4. 1. Introduction Magnetic fluids are of interest of many researchers due to their potential applications in physics and biology 1 2 . Magnetic fluids consist of magnetic nanoparticles a surfactant and a carrier liquid. The magnetic properties of magnetic fluids are determined by magnetic nanoparticles NPs . The surfactant helps Corresponding author. Tel. 84-4-5582216. E-mail nhhai@ nanoparticles to disperse in the carrier liquid. The carrier liquid can

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