Abstract

The yield stress in magnetorheological (MR) fluids is enhanced through their directed self-assembly under toggled (unsteady) magnetic fields. Experimental yield stress data are compared to previous experiments from the literature involving continuous (DC) fields in a wide range of particle concentrations at magnetic saturation using a double-gap magnetorheometer. Data generated with toggled fields are closer to theoretical predictions than conventional DC fields suggesting that generated structures under toggled fields are gap-spanning and closer to minimum energy state configurations. Experiments are in good agreement with particle level simulations.

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