Electrorheological (ER) and Magnetorheological (MR) nano-fluids show dramatic and tunable changes in their rheological properties und er external magnetic or electric field strength respectively. These nano-fluids can be eff ectively incorporated in various engineering applications like shock absorber,dampe rs,clutches etc. The major problem to use these nano-fluids practically is their low y ield strength and problem of sedimentation. In this paper various smart nano-flu ids (ER & MR) have been studied. Special attention is given on development of stable,re-dispersible,durable,high yield stress smart nano-fluids with low sedimentation rat e. In this paper these nano-fluids are reviewed along with their rheological characteristi cs under external fields.
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