Redispersibility in magnetorheological fluids and its relevance for MRF formulations

Abstract

Very important research, with both theoretical and experimental results in the advancement of physical models that explain the MR effect, try to keep the MRF formulation as simple as possible, usually with only two components: a magnetic dispersed phase and a carrier liquid. Many patents of MRF include three or four components, such as some surfactant and thixotropic additives. In order to formulate a good and reliable MRF for different applications such as MR shock absorbers, clutches, brakes, the MRF redispersibility is a challenge, but mandatory, key property for out of lab real world applications. This chapter, we shows how to measure and evaluate the MRF redispersibility.