Confined disordered strictly jammed binary sphere packings
Duyu Chen, Salvatore Torquato

TL;DR
This study investigates how binary sphere packings confined between two planes differ from bulk packings, revealing effects of confinement on packing density, disorder, and hyperuniformity, with implications for biological and industrial applications.
Contribution
We extend the Torquato-Jiao algorithm to generate maximally random jammed packings under confinement, analyzing their structural properties across various parameters.
Findings
Confined packings show different characteristics from bulk packings due to confinement frustration.
Rattler prevalence is higher in confined packings than in bulk.
Packing fraction and disorder generally increase with confinement height H.
Abstract
Disordered jammed packings under confinement have received considerably less attention than their \textit{bulk} counterparts and yet arise in a variety of practical situations. In this work, we study binary sphere packings that are confined between two parallel hard planes, and generalize the Torquato-Jiao (TJ) sequential linear programming algorithm [Phys. Rev. E {\bf 82}, 061302 (2010)] to obtain putative maximally random jammed (MRJ) packings that are exactly isostatic with high fidelity over a large range of plane separation distances , small to large sphere radius ratio and small sphere relative concentration . We find that packing characteristics can be substantially different from their bulk analogs, which is due to what we term "confinement frustration". Rattlers in confined packings are generally more prevalent than those in their bulk counterparts. We observe…
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