| 摘要 |
PURPOSE:To prevent a surfactant from being removed from magnetic superfine particles, by dispersing superfine particles of a magnetic metal or metallic compound in an aqueous or organic medium under the application of supersonic waves while using the surfactant having photo-polimerizable radicals in the molecule, and by applying light beams to the colloidal solution thus obtained. CONSTITUTION:Superfine particles of iron, cobalt, nickel or magnetic (Fe3O3) are dispersed in an aqueous medium such as water or in higher ester such as phosphoric acid or aliphatic acid or in an organic solvent such as saturated hydrocarbon, for example hexane or octane, while a surfactant as shown in the formula I having photo-polimerizable radicals in the molecule is used. Supersonic waves are applied to the obtained solution containing the superfine particles and the surfactant. After that, the photo-polimerizable radicals in the molecules of the surfactant are polimerized by optical radiation so that the molecules of the surfactant are bonded to each other. According to this method, the surfactant is effectively prevented from removing magnetic superfine particles in a magnetic fluid thus obtained. |
