Year: 2025
Type: article
Abstract: We show that, for a standard continuously polydisperse model with particle-diameter distribution $P(\ensuremath{\sigma})\ensuremath{\propto}{\ensuremath{\sigma}}^{\ensuremath{-}3}$ and polydispersity index $\mathrm{\ensuremath{\Delta}}$, employing a combination of standard SWAP moves and transient degree of freedom (TDOF) moves during a Lubachevsky-Stillinger-like particle-growth process dramatically increases the generated packings' jamming densities ${\ensuremath{\phi}}_{\mathrm{J}}(\mathrm{\ensuremath{\Delta}})$ and coordination numbers ${Z}_{\mathrm{J}}(\mathrm{\ensuremath{\Delta}})$, for a wide range of $\mathrm{\ensuremath{\Delta}}$. The fractional increase in ${\ensuremath{\phi}}_{\mathrm{J}}(\mathrm{\ensuremath{\Delta}})$ obtained by employing these moves first increases rapidly with $\mathrm{\ensuremath{\Delta}}$, then plateaus at $6--7%$ over the range $0.1\ensuremath{\lesssim}\mathrm{\ensuremath{\Delta}}\ensuremath{\le}0.5$; the obtained ${\ensuremath{\phi}}_{\mathrm{J}}$ are as high as 0.747 (for $\mathrm{\ensuremath{\Delta}}=0.50$). These density increases are achieved without producing clearly noticeable crystallization or increased fractionation, despite the fact that the packings are quite hyperstatic for all $\mathrm{\ensuremath{\Delta}}>0$. SWAP and TDOF moves also reduce packings' rattler populations by as much as 99% and increase their bulk moduli by as much as 80%.
Source: Physical review. E
DOI: 10.1103/3m8z-qxst
Author: Robert S. Hoy
Institution: University of South Florida
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: green
Funder: National Science Foundation
OpenAlex ID: W4416356384