金を部分的に被覆したマグネタイト粒子を分散させた磁性流体のエレクトロレオロジー特性

概要

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We report the preparation of electrorheological magnetic fluid and its rheological property under electromagnetic field. The ultrafine magnetite (≈10nm) was partially coated with gold by nonelectrolytic plating using gold (III) trichloride acid and sodium citrate. The partially plated particles were coated with surfactant and then dispersed stably in insulated oil such as kerosene. This fluid showed electrorheological property by applying electric field. When both magnetic and electric fields were applied to the fluid, the increase in shear stress mainly depended on electric field of 2kV/mm, not on magnetic field. This fluid has the property of magnetic fluid, for example, being stably retained in the electrode gap under a magnetic field. By applying both electric and magentic fields on this fluid, the new applications in damper, actuators and so on will be expected.
社団法人粉体粉末冶金協会の論文