Abstract
Water base magnetic fluid was obtained by allowing anionic surfactant to adsorb as a bimolecular layer on the hydrophobic surface of magnetite colloid prepared by monomolecular adsorption of oleate. Sodium dodecylbenzene sulfonate or sodium oleate was used as a surfactant giving the secondary adsorption layer. In this paper, coagulation and redispersion of water base magnetic fluid was investigated.The results are as follows:(1) The surfactant giving the secondary adsorption layer forms the free acid by acidifying the suspension, thereby the magnetic fluid can be coagulated.(2) It is difficult, however, to remove the formed flocs from liquid phase by conventional methods, such as sedimentation or fi ltration, because the flocs are not large enough to sediment or to be filtrated.(3) It was found that the magnetic separation of the flocs under high magnetic gradient was a very effective method.(4) A concentrated magnetic fluid is obtained upon addition of alkali to the flocs formed by the above method. In case of using sodium dodecylbenzene sulfonate as the secondary adsorption layer, the loss of the surfactant is 10%, and the loss of the magnetite colloid is 0.2% in the coagulation and redispersion processes.
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