Journal
NATURE MATERIALS
Volume 17, Issue 11, Pages 965-+Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41563-018-0175-5
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Funding
- University of Chicago Women's Board
- US Army Research Office [W911NF-16-1-0078]
- Chicago MRSEC - NSF [DMR-1420709]
- Center for Hierarchical Materials Design (CHiMaD)
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Dense suspensions of hard particles in a liquid can exhibit strikingly counter-intuitive behaviour, such as discontinuous shear thickening (DST)(1-7) and reversible shear jamming (SJ) into a state where flow is arrested and the suspension is solid-like(8-12). A stress-activated crossover from hydrodynamic interactions to frictional particle contacts is key for these behaviours(2-4,6,7,9,13). However, in experiments, many suspensions show only DST, not SJ. Here we show that particle surface chemistry plays a central role in creating conditions that make SJ readily observable. We find the system's ability to form interparticle hydrogen bonds when sheared into contact elicits SJ. We demonstrate this with charge-stabilized polymer microspheres and non-spherical cornstarch particles, controlling hydrogen bond formation with solvents. The propensity for SJ is quantified by tensile tests(12) and linked to an enhanced friction by atomic force microscopy. Our results extend the fundamental understanding of the SJ mechanism and open avenues for designing strongly non-Newtonian fluids.
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