tailieunhanh - Study on preparation of magnetic fluid based on synthesized Fe3O4 magnetic nanoparticles in water and organic solvents
Fe3O4 magnetic nanoparticles were synthesized by hydrothermal and thermal decomposition methods. Particles synthesized by hydrothermal method were water soluble meanwhile one by thermal decomposition method were organic soluble. Structure, morphology and magnetic properties of magnetic powders and magnetic fluid samples were characterized. | Vương Thị Kim Oanh và Đtg Tạp chí KHOA HỌC & CÔNG NGHỆ 190(14): 91 - 96 STUDY ON PREPARATION OF MAGNETIC FLUID BASED ON SYNTHESIZED Fe3O4 MAGNETIC NANOPARTICLES IN WATER AND ORGANIC SOLVENTS Vuong Thi Kim Oanh1,5*, Do Hai Doan1, Nguyen Xuan Truong1,5, Nguyen Xuan Ca2, Le The Tam3,5, Le Trong Lu4,5, Tran Dai Lam4,5 1 Institute of Materials Science – VAST, 2University of Sciences - TNU 3 Vinh University, 4Institute for Tropical Technology - VAST 5 Graduate University of Science and Technology - VAST ABSTRACT Fe3O4 magnetic nanoparticles were synthesized by hydrothermal and thermal decomposition methods. Particles synthesized by hydrothermal method were water soluble meanwhile one by thermal decomposition method were organic soluble. Structure, morphology and magnetic properties of magnetic powders and magnetic fluid samples were characterized. The XRD results pointed out that all of prepared samples had ferrite spinel single phase. The field emission scanning electron microscope (FESEM) and transmission electron microscopy (TEM) images revealed that the as-synthesized nanoparticles were spherical in shape and fairly uniform in size. The mean particle size of the samples synthesized at optimal conditions by hydrothermal method (2 hours, 160 oC) and thermal decomposition (2 hours, 300 oC) were 15 nm and 13 nm, respectively. The saturation magnetization (Ms) of as high as 63 emu/g and 70 emu/g corresponded to above samples. The magnetic fluid samples were treated with poly(acrylic acid) –PAA as the phase transfer ligand for a high stability with zeta potential values of about -40 to -50 mV. The magnetic fluid system has good dispersion and high stability, which open potential applications in biomedical. Keywords: hydrothermal method; thermal decomposition; magnetic fluid, phase transfer ligand; high stability INTRODUCTION* During the time, nanomaterials, including ferit spinel, have attracted a great deal of attention thanks to potential applications in various .
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