High-strength, relatively stable and redispersible MagnaLogic(TM) magneto-rheological (MR) fluids have been developed at the University of Pittsburgh and are being manufactured and marketed by CP Engineering, Inc.  With the application of a magnetic field, the MR fluid exhibits a rapid and nearly completely reversible change in its apparent viscosity, from a paint-like consistancy to a cream cheese-like one.  When the magnetic field is removed, it changes back again.

The MagnaLogic(TM) magnetic fluids patented by the University of Pittsburgh (U.S. Patent # 5,985,168) have significant advantages over existing MR fluids or electro-rheological (ER) fluids.  The ultimate strength or the yield stress of these fluids can be up to 100 kPa and is tunable using controlled changes in the fluid composition, as well as, by controlling the level of an external magnetic field.

The superior MagnaLogic(TM) MR fluids are redispersible and also relatively more stable against gravitational sedimentation.  These qualities are a result of the special coating on the surfaces of the suspended ferromagnetic or ferrimagnetic particles.

For up to six months after mixing, certain compositions of the MagnaLogic(TM) fluids show substantially no sedimentation.  This is a significant improvement over some of the conventional MR and ER fluids which may show sedimentation of magnetic or dielectric particles within hours and have been found to be extremely difficult to redisperse.

Current and future applications of the MagnaLogic(TM) fluids include active vibration control for automotive and other industries.  The applications of MR fluids, some of which are already commercial, include active shock absorbers, clutches, and brakes.  Other emerging MR fluid applications include polishing of aspherical surfaces, robotics, specialty actuators and earthquake-resistant high rise buildings.

CP Engineering, Inc. is looking for strategic alliances to develop new viable MagnaLogic(TM) applications  and/or devices for commercial, military or aerospace markets. 

MagnaLogic(TM) is a trademark of CP Engineering, Inc.