Fracture in nanoporous gold: An integrated computational and experimental study

Beets, Nathan; Stuckner, Joshua; Murayama, Mitsuhiro; Farkas, Diana

doi:10.1016/j.actamat.2019.12.008

Cited by 26 publications

(11 citation statements)

References 76 publications

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“…Recent studies show that the elastic modulus in tensile/compression should be very close; however, the material's density and ligament size are important parameters, which is why all the models overestimate our experimental results. [44] However, the one which takes into account the apparent density rather than the real density fits well with our lower-density materials, which is consistent with the low connectivity measured for these materials. [28,43] The continuous black line corresponds to the fit of our results by Equation (3), corresponding to a generalization of Gibson and Ashby's law for a nonpure bending behavior.…”

Section: Nanoindentation Testssupporting

confidence: 89%

“…To take this contribution into account, some studies suggest the use of an apparent density instead of the real one. [43][44][45][46] The curve plotted from a previous study [5] on Figure 2 corresponds to Gibson and Ashby's law, where instead of taking the real density of the foam, they took the apparent density which was estimated at 4ρ 3 when the real density is below 50%. [43] Gibson and Ashby's law was not valid for our materials even for low density (cf.…”

Section: Nanoindentation Testsmentioning

confidence: 99%

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Mechanical Properties of FeCr‐Based Composite Materials Elaborated by Liquid Metal Dealloying towards Bioapplication

et al. 2020

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Liquid metal dealloying (LMD) is a new technology to create porous materials. From a (FeCr) x-Ni 1-x precursor, it is possible to get a bicontinuous structure of FeCr and Mg: a metal-metal composite. An etching step removes the Mg solidstate solution phase to give a metal-air composite. The last step, polymer infiltration, gives metal-polymer composites. Herein, metal-metal, metal-air, and metal-polymer (rubbery or glassy polymers) with three different phase ratios are elaborated by LMD from Ni-based precursors and their mechanical properties are analyzed. A full polymer infiltration into the pores is obtained and the epoxy polymer properties are not affected by the metallic foam presence. Concerning control of the mechanical properties, the material's second-phase selection is a key factor. Herein, it is shown that the mechanical properties are easily designed by optimizing phase ratio, ligament size, and second-phase type and that these materials are promising materials for biomedical applications.

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Section: Nanoindentation Testssupporting

confidence: 89%

Section: Nanoindentation Testsmentioning

confidence: 99%

Mechanical Properties of FeCr‐Based Composite Materials Elaborated by Liquid Metal Dealloying towards Bioapplication

et al. 2020

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“…Templating represents deposition of the gold over an artificial or natural matrix with different sizes, with the porous structure being obtained after removing the template [ 24 ]. Several drawbacks are associated with these techniques, such as the increased stress within the structure, which might lead to cracks that can be detrimental especially for further technological processing or sensing applications [ 25 ], or the residual less noble metal after dealloying that artificially increases the double layer capacitance of the porous film [ 26 , 27 ]. Last, but not the least, the technology is problematic when the fragile, difficult to handle dealloyed leaves are then transferred onto a substrate (e.g., silicon wafers) that would be further subjected to the different photolithographic processes.…”

Section: Introductionmentioning

confidence: 99%

From Chip Size to Wafer-Scale Nanoporous Gold Reliable Fabrication Using Low Currents Electrochemical Etching

et al. 2020

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We report a simple, scalable route to wafer-size processing for fabrication of tunable nanoporous gold (NPG) by the anodization process at low constant current in a solution of hydrofluoric acid and dimethylformamide. Microstructural, optical, and electrochemical investigations were employed for a systematic analysis of the sample porosity evolution while increasing the anodization duration, namely the small angle X-ray scattering (SAXS) technique and electrochemical impedance spectroscopy (EIS). Whereas the SAXS analysis practically completes the scanning electronic microscopy (SEM) investigations and provides data about the impact of the etching time on the nanoporous gold layers in terms of fractal dimension and average pore surface area, the EIS analysis was used to estimate the electroactive area, the associated roughness factor, as well as the heterogeneous electron transfer rate constant. The bridge between the analyses is made by the scanning electrochemical microscopy (SECM) survey, which practically correlates the surface morphology with the electrochemical activity. The results were correlated to endorse the control over the gold film nanostructuration process deposited directly on the substrate that can be further subjected to different technological processes, retaining its properties. The results show that the anodization duration influences the surface area, which subsequently modifies the properties of NPG, thus enabling tuning the samples for specific applications, either optical or chemical.

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“…Beets et al [27] presented a simulation/experimental integrated study examining crack propagation in nanoporous gold. They observed cracks in both samples propagating by the same mechanisms of sequential individual ligament failure.…”

Section: Introductionmentioning

confidence: 99%

MeV irradiation of tungsten nanowires: structural modifications

Grossi

Kohanoff

Bringa

2020

Mater. Res. Express

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In this work we use the Two Temperature Model coupled to Molecular Dynamics (TTM-MD) to study swift heavy ion irradiation of W finite nanowires. Au projectiles are considered with energies ranging from 20 to 50 MeV, which correspond to electronic stopping values less than 20 keV nm −1 in the regime where electronic stopping is larger than nuclear stopping. Nanowires with diameters much smaller than the electron mean free path are considered for two different sizes with an aspect ratio ∼3.7 between length and diameter. Nanowires display radiation-induced surface roughening, sputtering yields and the formation of point defects and di-vacancies. For the smallest size, a hole stays opened in the central part of the wire for S e > 12.6 keV nm −1 . W nanofoams, considered as collections of connected nanowires like those simulated here, are expected to behave similarly under irradiation displaying radiation resistance for the electronic stopping range that has been considered. In fact, nanowires larger than tens of nm would be needed for defect accumulation and lack of radiation resistance.

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Fracture in nanoporous gold: An integrated computational and experimental study

Cited by 26 publications

References 76 publications

Mechanical Properties of FeCr‐Based Composite Materials Elaborated by Liquid Metal Dealloying towards Bioapplication

Mechanical Properties of FeCr‐Based Composite Materials Elaborated by Liquid Metal Dealloying towards Bioapplication

From Chip Size to Wafer-Scale Nanoporous Gold Reliable Fabrication Using Low Currents Electrochemical Etching

MeV irradiation of tungsten nanowires: structural modifications

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