抄録
Colored water-based magnetic fluid (red, yellow, blue and black) are obtained by mixing magnetic fluid with dye solution. Red and yellow magnetic fluid contain Mg-Zn ferrite particles, and blue and black contain Mn-Zn feriite particles. These ferrite particles are obtained by hydrothermal synthesis. These particles covered with mono-molecular adsorption layer of oleic ions is stably dispered in suitable concentration of sodium dodeccylbenzenesulfonate solution. For the purpose of using under the same magnetic field, thier magnetization intensities are adjusted to about 1.4 emu/g under the 8 k0e magnetic field, then the reflected color of each magnetic fluid painted on a white paper is close to that of dye solution. Transmitted color of each fluid becomes also very bright. Viscosity of each colored magnetic fluid mentioned above is less than 2 cp.
