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In this paper, CoFe2CO4 nanoparticles, p-NiFe2O4 nanoparticles and Ni2O3/Fe2O3 nanoparticles are prepared by chemical co-precipitation. Using the XRD, EDX, XPS, TEM analyze the nanoparticles’ crystal structure, atomic ratios, Internal structure and morphology, respectively.These two nanoparticles are used to product 2 percent mother fluids by Massart method, respectively, then the two fluids are mixed with the same volume to obtain the binary ionic fluids. Then dilute mother fluids, we can obtain different ferrofluids of volume fraction, measure the density, viscosity, magnetization, magnetic optic.Compared the magnetic of single CoFe2O4 and the CoFe2O4 which in the binary ferrofluids, analyzing the weak magnetic p-NiFe2O4 nanoparticles’ modulation which in the binary ferrofluids. In binary CoFe2O4-p-NiFe2O4 ferrofluids, CoFe2O4 nanoparticles are theme of field-induced, p-NiFe2O4 nanoparticles may suppress or enhance the field-induced composition. In magnetic measuring, It found that the modulation of the p-NiFe2O4 nanoparticles is not monotone linear relationship, but to be a critical volume fraction, when weak magnetic ferrofluids under this critical volume fraction, the magnetic part of binary ferrofluids will enhance with the weak magnetic nanoparticles added, or when weak magnetic ferrofluids over this critical volume fraction, the the magnetic part of binary ferrofluids will decrease with the weak magnetic nanoparticles added. It can conclude that the magnetization of the binary system is not a simply summed.The transmitted ration of light through single and binary ferrofluids under stable magnetic field are measured, according to the model of particles chains’ formed and moved, it can explain the transmitted changeable of binary ferrofluids, studying the modulation effect of weak magnetic nanoparticles.Ni2O3/Fe2O3 nanoparticles and ferrofluids are preliminary researched.
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