| 摘要 |
PURPOSE:To easily and precisely control viscocity and also to enhance the dispersibility of particles by a method wherein a conductive substance is deposited or formed in film on a part of the surface of magnetic fine particles. CONSTITUTION:A magnetic electrorheology fluid is obtained by depositing or film-forming a conductive substance on a part of the surface of magnetic fine particles and also by dispersing the fine particles, the whole surface of which is coated with a surface activating agent thin film, in an electrically insulated liquid. The above-mentioned magnetic fine particles consist of oxide ferromagnetic material and metal ferromagnetic material, and to be concrete, ferrite fine particles represented by magnetite, or iron fine powder and cobalt fine powder, and their alloy fine powder can be enumerated. Magnetic electrorheology fluid 6 is filled in between the outer cylinder 2 and the inner cylinder 3 of a measuring device 1, then the outer cylinder is rotated, and the relation between the shearing stress and the shearing speed, when electrolysis or an electric field is in operation simultaneously with the rotation, is computed. |
