This work investigates the relationship between the morphology of nanoporous (NP) Au metal foams and their response to elastic deformation. A detailed statistical analysis of scanning electron micrographs has been performed to obtain a quantitative description of ligaments and nodes in terms of characteristic lengths. The thickness of ligaments is shown to vary along their length according to a quadratic function. The relatively broad distribution of ligament length and thickness indicates that local structures can be significantly different from each other. Invariably, nodes are quite massive. Based on this experimental evidence, a phenomenological model of the NP Au structure has been developed to describe its mechanical response within the elastic deformation range. The elementary structural unit consists of a cubic node connecting with six half ligaments with a square cross-section and a parabolic thickness profile. The model predicts that the bending behavior is restricted to the central portion of the ligaments, the effective response being modulated by the ligament characteristic lengths. Model predictions are found to agree fairly well with experimental data.

Nanoporous Au: Statistical analysis of morphological features and evaluation of their influence on the elastic deformation behavior by phenomenological modeling

PIA, GIORGIO;DELOGU, FRANCESCO
2015

Abstract

This work investigates the relationship between the morphology of nanoporous (NP) Au metal foams and their response to elastic deformation. A detailed statistical analysis of scanning electron micrographs has been performed to obtain a quantitative description of ligaments and nodes in terms of characteristic lengths. The thickness of ligaments is shown to vary along their length according to a quadratic function. The relatively broad distribution of ligament length and thickness indicates that local structures can be significantly different from each other. Invariably, nodes are quite massive. Based on this experimental evidence, a phenomenological model of the NP Au structure has been developed to describe its mechanical response within the elastic deformation range. The elementary structural unit consists of a cubic node connecting with six half ligaments with a square cross-section and a parabolic thickness profile. The model predicts that the bending behavior is restricted to the central portion of the ligaments, the effective response being modulated by the ligament characteristic lengths. Model predictions are found to agree fairly well with experimental data.
Porous material; Nanostructured material; Metals and alloys; Elastic behavior; Modeling
File in questo prodotto:
File Dimensione Formato  
Nanoporous Au_Statistical analysis of morphological features and evaluation of their influence on the elastic deformation behavior by phenomenological modeling.pdf

Solo gestori archivio

Descrizione: articolo completo
Tipologia: versione editoriale
Dimensione 1.65 MB
Formato Adobe PDF
1.65 MB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11584/116261
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 30
  • ???jsp.display-item.citation.isi??? 30
social impact