Ferrofluid with modified stabilisant

We describe the preparation method of a new ferrofluid in which the stabili zing agent (the oleic acid) is partially replaced with silicon oil PDMS or PMFS. For the obtained probes we study: the density, magnetic susceptibilit y and viscosity. The studies show that the magnetic susceptibility is a mon otonically decreasing function of silicon oil concentration. The density in creases slowly as well as the viscosity as a function of silicon oil concen tration. The distinction with respect to the ferrofluid based on oleic acid stabilization consists in the behavior of the viscosity in a magnetic fiel d. (C) 1999 Elsevier Science B.V. All rights reserved.