Computational predictions of porosities, pore size distributions, and conductivities of aerosol deposited particulate films

Research output: Contribution to journalArticlepeer-review

Abstract

The structure and resulting physical properties of aerosol deposited particulate films are governed by the size distribution and morphology of the depositing particles as well as the physics governing particle deposition. While particulate film deposition processes are qualitatively understood, the link between particle characteristics and deposition physics to film properties has not been probed systematically. Here we apply a combination of Langevin dynamics deposition simulations, Monte Carlo pore size distribution calculations, and predictions of thermal conductivities to better establish such process parameter-film property relationships. We account for partial coalescence, polydispersity, and aggregate deposition. We establish that the deposition of polydisperse and aggregated particles leads to broadening of the pore size distribution function and an increase in the mode pore size. Via a non-continuum gas conductivity model, we show that aerosol deposited films can achieve porosities and thermal conductivities similar to conventional aerogels.

Original languageEnglish (US)
Pages (from-to)400-409
Number of pages10
JournalPowder Technology
Volume378
DOIs
StatePublished - Jan 22 2021

Bibliographical note

Funding Information:
This work was supported by the ARPA-E SHIELD Program (DE- AR0000740 ).

Keywords

  • Aerosol deposition
  • Langevin dynamics
  • Particulate films
  • Pore size distribution

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