New hybrid magneto rheometer can advance nano smart magnetorheological fluid technologies

A hybrid magneto‑rheometer, developed by scientists at IIT Patna with support from the Department of Science and Technology, can simultaneously measure rheological and tribological properties of nano‑iron‑powder based magnetorheological (MR) fluids in compression‑plus‑shear (mixed) mode, both with and without a magnetic field. The device generates a constant high‑magnitude magnetic field at low current and records behaviour under varied normal loads. This capability overcomes the existing limitation of conventional testing methods, which largely ignore the mixed‑mode operation of MR fluids. The improved characterisation is relevant for adaptive technologies such as brakes, clutches, shock absorbers, actuators, and medical devices, and for sectors including defence, aerospace, and automation.