Dynamic capillary assembly of colloids at interfaces with 10,000g accelerations

Axel Huerre, Marco De Corato and Valeria Garbin

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Received: 27th April 18

High-rate deformation of soft matter is an emerging area central to our understanding of far-from-equilibrium phenomena during shock, fracture, and phase change. Monolayers of colloidal particles are a convenient two-dimensional model system to visualise emergent behaviours in soft matter, but previous studies have been limited to slow deformations. Here we probe and visualise the evolution of a monolayer of colloids confined at a bubble surface during high-rate deformation driven by ultrasound. We observe the emergence of a transient network of strings, and use discrete particle simulations to show that it is caused by a delicate interplay of dynamic capillarity and hydrodynamic interactions between particles oscillating at high frequency. Remarkably, we find evidence of inertial effects in a colloidal system, caused by accelerations approaching 10,000\textit{g}. These results also suggest that extreme deformation of soft matter offers new opportunities for pattern formation and dynamic self-assembly.

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This is an abstract of a preprint hosted on an independent third party site. It has not been peer reviewed but is currently under consideration at Nature Communications.

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