发明名称 |
Method for manufacturing oil-based ferrofluid |
摘要 |
A slurry is formed of particles of a non-magnetic oxide of iron ( alpha -Fe2O3), an oil carrier liquid and a surfactant. The slurry is then processed in an attrition mill where kinetic energy is applied to the slurry to convert the alpha -Fe2O3 particles to magnetic iron oxide particles to form an oil-based ferrofluid. In order to increase the saturation magnetization of the resulting ferrofluid, a beneficial agent is brought into contact with the slurry during processing in the attrition mill. The beneficial agent can be a magnetic material, such as elemental iron, or can be water. A ferrofluid can also be formed by creating a powder of surfactant-coated magnetic particles and using an attrition mill to coat the particles with a second surfactant and suspend the coated particles in a carrier liquid.
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申请公布号 |
US6068785(A) |
申请公布日期 |
2000.05.30 |
申请号 |
US19980021229 |
申请日期 |
1998.02.10 |
申请人 |
FERROFLUIDICS CORPORATION |
发明人 |
RAJ, KULDIP;AZIZ, LUTFUL M.;ROSENSWEIG, RONALD E. |
分类号 |
H01F1/34;H01F1/44;(IPC1-7):H01F1/44 |
主分类号 |
H01F1/34 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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