A method for producing magnetic microparticles, thus obtained magnetic fine particles and the magnetic fluid, magnetic products

摘要

PPROBLEM TO BE SOLVED: To provide a method for producing fine magnetic-substance particles by which monodisperse fine magnetic-substance particles can be produced and clogging of a product can be suppressed owing to the self-dischargeability thereof and necessity of high pressure can be obviated and productivity can be improved. PSOLUTION: This process is characterized as follows: at least two fluids are used; at least one of the fluids is a fluid containing at least one raw material for a magnetic substance; and at least one of the fluids other than the above fluid is a fluid containing at least one precipitant for fine magnetic-substance particles. Further, the fluids are caused to meet each other in a thin-film fluid formed between treatment planes which are disposed face to face with each other in a manner capable of being brought near to or apart from each other and at least one of which rotates with respect to the other. Thus, fine magnetic-substance particles are precipitated in the above thin-film fluid to obtain the fine magnetic-substance particles. PCOPYRIGHT: (C)2009,JPO&INPIT