Dense (&gt;30% v/v) suspensions of hard particles in a liquid can exhibit strikingly counter-intuitive behavior, such as discontinuous shear thickening (DST) and reversible, shear-induced solidification known as shear jamming (SJ). Though recent studies suggest that frictional, particle-particle contacts give rise to these behaviors, many suspensions of frictional particles exhibit only DST and not SJ. We investigate the role of particle surface chemistry by controlling the solvent and surface chemistry of colloidal particles, finding that SJ is sensitively dependent on the system's ability to form interparticle hydrogen bonds. Our results extend the fundamental understanding of the SJ mechanism in dense colloidal suspensions and open new avenues for designing strongly non-Newtonian fluids for soft robotics and smart materials through controlling the surface chemistry and chemical interactions between particles in these systems.

Interparticle hydrogen bonding influences the shear jamming of dense colloidal suspensions

255th National Meeting (2018)

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