Publications (11)
Local polar order controls mechanical stress and triggers layer formation in developing Myxococcus xanthus colonies
Endao Han, Chenyi Fei, Ricard Alert +4
Colonies of the social bacterium Myxococcus xanthus go through a morphological transition from a thin colony of cells to three-dimensional droplet-like fruiting bodies as a strateg…
Intrusion into granular media beyond the quasi-static regime
Leah K. Roth, Endao Han, Heinrich M. Jaeger
The drag force exerted on an object intruding into granular media can depend on the object's velocity as well as the depth penetrated. We report on intrusion experiments at constan…
Effect of two parallel intruders on net work during granular penetrations
Swapnil Pravin, Brian Chang, Endao Han +4
The impact of single passive intruders into granular particles has been studied in detail. However, the impact force produced by multiple intruders separated at a distance from one…
Constitutive relations for shear fronts in shear-thickening suspensions
Endao Han, Matthieu Wyart, Ivo R. Peters +1
We study the fronts that appear when a shear-thickening suspension is submitted to a sudden driving force at a boundary. Using a quasi-one-dimensional experimental geometry, we ext…
Dynamic jamming of dense suspensions under tilted impact
Endao Han, Liang Zhao, Nigel Van Ha +3
Dense particulate suspensions can not only increase their viscosity and shear thicken under external forcing, but also jam into a solid-like state that is fully reversible when the…
High-speed ultrasound imaging in dense suspensions reveals impact-activated solidification due to dynamic shear jamming
Endao Han, Ivo R. Peters, Heinrich M. Jaeger
A remarkable property of dense suspensions is that they can transform from liquid-like at rest to solid-like under sudden impact. Previous work showed that this impact-induced soli…
Dynamic and programmable cellular-scale granules enable tissue-like materials
Yin Fang, Endao Han, Xin-Xing Zhang +26
Tissue-like materials are required in many robotic systems to improve human-machine interactions. However, the mechanical properties of living tissues are difficult to replicate. S…
Interparticle hydrogen bonding can elicit shear jamming in dense suspensions
Nicole James, Endao Han, Justin Jureller +1
Dense suspensions of hard particles in a liquid can exhibit strikingly counter-intuitive behavior, such as discontinuous shear thickening (DST) [1-8] and reversible shear jamming (…
Dynamic shear jamming in dense granular suspensions under extension
Sayantan Majumdar, Ivo R. Peters, Endao Han +1
Unlike dry granular materials, a dense granular suspension like cornstarch in water can strongly resist extensional flows. At low extension rates, such a suspension behaves like a…
Low-Reynolds-number, bi-flagellated Quincke swimmers with multiple forms of motion
Endao Han, Lailai Zhu, Joshua W. Shaevitz +1
In the limit of zero Reynolds number (Re), swimmers propel themselves exploiting a series of non-reciprocal body motions. For an artificial swimmer, a proper selection of the power…
Stress controlled rheology of dense suspensions using transient flows
Endao Han, Nicole M. James, Heinrich M. Jaeger
Dense suspensions of hard particles in a Newtonian liquid can be jammed by shear when the applied stress exceeds a certain threshold. However, this jamming transition from a fluid…