Adhesive Loose Packings of Small Particles
Wenwei Liu, Shuiqing Li, Adrian Baule, Hern\'an A. Makse

TL;DR
This paper investigates how adhesion affects the packing density and structure of small spherical particles, revealing a universal regime describable by a statistical mechanical model and identifying key packing points.
Contribution
It introduces a dimensionless adhesion parameter and a coarse-grained ensemble approach to describe adhesive packings, extending the understanding of jammed matter.
Findings
Universal adhesive packing regime identified for $Ad>1$
Equation of state for adhesive packings derived
Maximal loose packing at $Z=2$, $\,\phi=1/8$
Abstract
We explore adhesive loose packings of dry small spherical particles of micrometer size using 3D discrete-element simulations with adhesive contact mechanics. A dimensionless adhesion parameter () successfully combines the effects of particle velocities, sizes and the work of adhesion, identifying a universal regime of adhesive packings for . The structural properties of the packings in this regime are well described by an ensemble approach based on a coarse-grained volume function that includes correlations between bulk and contact spheres. Our theoretical and numerical results predict: (i) An equation of state for adhesive loose packings that appears as a continuation from the frictionless random close packing (RCP) point in the jamming phase diagram; (ii) The existence of a maximal loose packing point at the coordination number and packing fraction . Our…
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