Preliminary Study Of Ionic Binary Ferrofluids

Particles of ZnFe₂O₄, MnFe₂O₄and CoFe₂O₄ are prepared by a chemical coprecipitation method; ferrofluids of ZnFe₂O₄ and MnFe₂O₄ are prepared to use the method of Massart, binary ferrofluids is produced by fully mixing ZnFe-2O₄ and MnFe₂O₄ ferrofluids at volume ratio 4:1.The crystal structure, atom ration and morphology are analyzed by XRD,TEM,EDX, respectively. The results show that particles are preferable crystal, the atom ration between M(Co,Zn) and Fe is about 1:2, the morphology of both the MFe₂O₄ (M= Co,Zn,Mn) particles are basically sphere, the median value of the ZnFe₂O₄ particles diameter is 4.22nm, the median value of the MnFe₂O₄ particles diameter is 16.46nm and the median value of the CoFe₂O₄ particles diameter is 12.76nm.The magnetization of the system of ferrofluids and mixed binary nanoparticles system are measured by VSM. It is obtained that the first magnetize curve, coercive force, saturation magnetization. The results show that magnetization of the binary system are not simplify added from magnetization of the every system.The transmitted ration of light through ferrofluids under stable magnetic field is measured. The experimental results are explained with the model of chain-formed of particles and movement of the chain in ferrofluids.The self-formed ionic ferrofluids of ZnFe₂O₄ can be a magnetic gel under a suitably condition. The condition and basic physical properties of the ZnFe₂O₄ magnetic gel are preliminary researched.