Multiscale modeling of charge-induced deformation of nanoporous gold structures

S. S. R. Saane, K.R. Mangipudi, K. U. Loos, J. Th. M. De Hosson, P. R. Onck*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

36 Citations (Scopus)

Abstract

Recent experimental studies have shown that nanoporous metals undergo dimensional changes when a potential difference is applied in an electrochemical environment. The primary actuation mechanism is the electric-double layer charging of the internal surface in combination with a large surface-to-volume-ratio. To account for the excess charge we have developed an atomistic model that is calibrated to density functional theory. To make a scale transition from the atomistic to the continuum scale, we propose a surface layer model that is informed by atomistic simulations. We use this multiscale approach to study the charge-induced actuation response of ordered (cubic lattices and gyroids) and disordered nanoporous gold (npg) architectures. Results are presented in terms of the charge-induced actuation strain and work density as a function of relative density, ligament size and architectural morphology. The differences between ordered and disordered structures are critically addressed. (C) 2014 Elsevier Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)1-15
Number of pages15
JournalJournal of the Mechanics and Physics of Solids
Volume66
DOIs
Publication statusPublished - May-2014

Keywords

  • Nanoporous gold
  • Actuation
  • Molecular dynamics
  • Work density
  • Finite element model
  • MECHANICAL-PROPERTIES
  • YIELD STRENGTH
  • AB-INITIO
  • AU
  • METAL
  • ACTUATION
  • AG(110)
  • STRAIN
  • GROWTH
  • FOAMS

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