The Mechanical Response of Nanoporous Gold and Silver Foams with Varying Composition and Surface Segregation

Beets, Nathan; Farkas, Diana; Albe, Karsten

doi:10.1016/j.actamat.2020.10.064

Cited by 11 publications

(3 citation statements)

References 62 publications

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“…Mechanical properties may also depend on the LNE content, either indirectly through the solid fraction (which is higher if not all LNE has been removed), 323 or directly through the effect of the composition on the local strength of the ligaments. 358 The impact of the residual LNE on the materials behavior, for instance for catalysis and mechanics, depends on the spatial distribution of that component. For instance, catalytic reactions or the nucleation of lattice dislocations in mechanics will depend on the local concentration of LNE at the surface.…”

Section: Chemical Heterogeneitymentioning

confidence: 99%

“…That is of relevance because, as will be discussed below in sections , , and , the residual LNE has important consequences for the catalytic activity. Mechanical properties may also depend on the LNE content, either indirectly through the solid fraction (which is higher if not all LNE has been removed), or directly through the effect of the composition on the local strength of the ligaments …”

Section: Microstructure and Metrics For Its Descriptionmentioning

confidence: 99%

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Nanoporous Gold: From Structure Evolution to Functional Properties in Catalysis and Electrochemistry

et al. 2023

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Nanoporous gold (NPG) is characterized by a bicontinuous network of nanometer-sized metallic struts and interconnected pores formed spontaneously by oxidative dissolution of the less noble element from gold alloys. The resulting material exhibits decent catalytic activity for low-temperature, aerobic total as well as partial oxidation reactions, the oxidative coupling of methanol to methyl formate being the prototypical example. This review not only provides a critical discussion of ways to tune the morphology and composition of this material and its implication for catalysis and electrocatalysis, but will also exemplarily review the current mechanistic understanding of the partial oxidation of methanol using information from quantum chemical studies, model studies on single-crystal surfaces, gas phase catalysis, aerobic liquid phase oxidation, and electrocatalysis. In this respect, a particular focus will be on mechanistic aspects not well understood, yet. Apart from the mechanistic aspects of catalysis, best practice examples with respect to material preparation and characterization will be discussed. These can improve the reproducibility of the materials property such as the catalytic activity and selectivity as well as the scope of reactions being identified as the main challenges for a broader application of NPG in target-oriented organic synthesis.

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Section: Chemical Heterogeneitymentioning

confidence: 99%

Section: Microstructure and Metrics For Its Descriptionmentioning

confidence: 99%

Nanoporous Gold: From Structure Evolution to Functional Properties in Catalysis and Electrochemistry

et al. 2023

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“…Many studies have found that Au has a strong tendency to segregate to the outer surface. 82,83 Beets et al 16 studied nanoporous gold with Ag surface segregation, and the results showed that Ag atoms separated slightly enhanced the strength of nanoporous gold, and the elastic properties were still controlled by its internal composition. Figure S1(a),(b) in the Supporting Information shows the initial and relaxed atomic configurations of coated NP-Au@Pt with a coating thickness of 0.8 nm, respectively, and it can be found that a very small amount of surface segregation of Au atoms occurs after relaxation.…”

Section: Resultsmentioning

confidence: 99%

Molecular Dynamics Investigation of the Toughening Mechanism in Core–Shell Nanoporous Gold Modified by Pt Layers: Implications for Sensing Applications

Li,

Dai,

2024

ACS Appl. Nano Mater.

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Nanoporous metals demonstrate significant potential in a variety of innovative structures and functional domains, but their limited macroscopic plasticity hinders their industrial application. In this work, we constructed a core–shell structure by modifying nanoporous gold (NP-Au) with Pt atoms and investigated its mechanical response via molecular dynamics simulations. The results showed that the introduction of the Pt shell layer to form a core–shell structure effectively enhances the plasticity of NP-Au. Specifically, the lattice mismatch between the Pt shell layer and Au core layer induces elevated interfacial stress, leading to heightened initial dislocation density and intensified dislocation activity during deformation, which promotes the formation of Lomer–Cottrell locks and helps resist fracture. Additionally, the Pt shell layer mitigates strain localization and facilitates the nucleation and propagation of nanotwins. These synergistic mechanisms collectively contribute to the observed enhancement in plasticity, with greater reinforcement observed as the thickness of the Pt coating layer increases. Through quantitative comparative analysis between decorated specimens with equivalent relative density to NP-Au, it can be concluded that the strength and modulus augmentation in coated NP-Au@Pt might primarily stem from an increase in relative density rather than the special core–shell structure. Our findings clarify the toughening mechanism of the core–shell nanoporous structure, which provides a structural design strategy of ductile nanoporous materials for sensing applications.

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Atomistic simulations of tensile deformation of a nanoporous high-entropy alloy

et al. 2022

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The Mechanical Response of Nanoporous Gold and Silver Foams with Varying Composition and Surface Segregation

Cited by 11 publications

References 62 publications

Nanoporous Gold: From Structure Evolution to Functional Properties in Catalysis and Electrochemistry

Nanoporous Gold: From Structure Evolution to Functional Properties in Catalysis and Electrochemistry

Molecular Dynamics Investigation of the Toughening Mechanism in Core–Shell Nanoporous Gold Modified by Pt Layers: Implications for Sensing Applications

Atomistic simulations of tensile deformation of a nanoporous high-entropy alloy

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