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Jeremy N. Fowler, John Kirkwood, Norman J. Wagner
Rheology and microstructure of shear thickening fluid suspoemulsions
Appl. Rheol. 24:4 (2014) 43049 (10 pages)
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A novel shear thickening suspoemulsion is formulated and studied with a new rheo-microscope instrument. The experimental
fluid system is comprised of a immiscible blend of Newtonian, low molecular weight poly(dimethylsiloxane) and a shear
thickening suspension of colloidal silica in poly(ethylene glycol). The blend is studied as a function of composition where
phase inversion is evident at low shear rates and is found to be shear rate dependent. A shear thickening viscosity curve is
observed when blends comprised of shear thickening fluid dispersed as droplets are subjected to high shear rates. Dispersing
a continuously shear thickening fluid, φsilica
= 0.42, results in continuously shear thickening response from the blend.
Dispersing a discontinuously shear thickening fluid, φsilica = 0.51, results in bulk shear thickening that can also be discontinuous.
Shear thickening in the final suspoemulsion is consistently first detected at φSTF = 0.2, with the magnitude of shear
thickening being dependent on the particle concentration in the STF phase. The onset of shear thickening also corresponds
with the formation of extended droplet structures in the fluid. The complex properties of these suspoemulsions and the ability
to formulate dispersed droplet morphologies in this mixture are shown to result from the underlying shear thickening
rheology of the dispersed phase.
► Cite this publication as follows:
Fowler JN, Kirkwood J, Wagner NJ: Rheology and microstructure of shear thickening fluid suspoemulsions, Appl. Rheol. 24 (2014) 43049.
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