Preparation of temperature sensitive magnetic fluid.
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概要
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Magnetocaloric energy conversion using magnetic fluid has been studied by some researchers. The development of high temperature sensitivity and high ther mal conductivity of magnetic fluid is needed for efficient heat transfer. In this experiment, especially the highly temperature sensitive ultrafine ferrites at temper atures of 223 to 373 K were investigated. Mixed zinc ferrites of lOnm containing calcium ion were prepared by coprecipitation. They showed larger magnetizationand larger magnetization change per temperature than mixed zinc ferrites containing no calcium. Ni-Ca-Zn or Co-Ca-Zn ferrites gave approximately 2×10<SUP>-3</SUP>T/K at 273K by applying 3.2×10<SUP>5</SUP>A/m of magnetic field. Higher temperature sensitive, kerosene or water based magnetic fluid was prepared by dispersing these ferrites than the conventional magnetic fluid.
- 日本素材物性学会の論文
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