Synthesis and Dispersion of Magnetic Nano-Particles by a Surfactant-Mediated Approach
Magnetic nano-particles of around 20nm synthesized by poly-ethylene glycol (PEG) and sodium oleate mediated approach show well stability without sediment during 6 months. Upon treated through the modification procedure, magnetic nano-particles have a weakly physical bond with PEG, meanwhile a strong bond with sodium oleate. Naked magnetic nano-particles present positive charges on the surface, while turn to be negative when modified with sodium oleate, which suggest that the hydrophilic carboxyl on the surface of the nano-particles is outward. Magnetic property of the nano-particles changes according to the concentrations of reactants and surfactant.
Xingdong Zhang, Xudong Li, Hongsong Fan, Xuanyong Liu
P. Hou et al., "Synthesis and Dispersion of Magnetic Nano-Particles by a Surfactant-Mediated Approach", Key Engineering Materials, Vols. 330-332, pp. 231-234, 2007