Various base ER fluid compositions are shown to have dramatically enhanced shear stresses when dispersed into poly(hexyl isocyanate)/xylene solutions as compared to being dispersed into polystyrene/xylene solutions. The concentration of the PHIC solutions was 4.5% which is well below that for liquid crystallinity. Further, the additon of small amounts (1-3%) of other particles to the suspensions show significant enhancement of the shear stresses for softer particles.
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