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A number of dense particle suspensions experience a dramatic increase inviscosity with the shear stress, up to a solid-like response. Thisshear-thickening process is understood as a transition under flow of the natureof the contacts, from lubricated to frictional, between initially repellentparticles. Most systems are now assumed to fit in with this scenario, which isquestionable. Using an in-house pressure sensor array, we provide aspatio-temporal map of the normal stresses in the flows of two shear-thickeningfluids: a stabilised calcium carbonate suspension, known to fit in with thestandard scenario, and a cornstarch suspension, which spectacular thickeningbehavior remains poorly understood. We evidence in cornstarch a unique, stableheterogeneous structure, which moves in the velocity direction and does notappear in calcium carbonate. Its nature changes from a stress wave to a rollingsolid jammed aggregate at high solid fraction and small gap width. The modelingof these heterogenities points to an adhesive force between cornstarchparticles at high stress, also evidenced in microscopic measurements.Cornstarch being also attractive at low stress, it stands out of the classicalshear-thickening frame, and might be part of a larger family of adhesive andattractive shear-thickening fluids.

Shear-thickening in presence of adhesive contact forces: the singularity of cornstarch