Surface area of nanoporous gold: Effect on temperature

Lakshmanan, C.; Viswanath, R. N.; Polaki, S. R.; Rajaraman, R.; Dash, S.; Tyagi, A. K.

doi:10.1016/j.electacta.2015.09.104

Cited by 16 publications

(15 citation statements)

References 41 publications

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“…This means that the specific surface depends on sample density. These values of specific surface are comparable to porous NiCr obtained with the same methods [11] but very low compared to nanoporous gold obtained by dealloying in aqueous solution [47]. In the present study, our samples, were not particularly designed to get very small ligaments.…”

Section: Quantitative Analysissupporting

confidence: 76%

Microstructure characterization by X-ray tomography and EBSD of porous FeCr produced by liquid metal dealloying

Mokhtari

Bourlot

Adrien

et al. 2018

Materials Characterization

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Section: Quantitative Analysissupporting

confidence: 76%

Microstructure characterization by X-ray tomography and EBSD of porous FeCr produced by liquid metal dealloying

Mokhtari

Bourlot

Adrien

et al. 2018

Materials Characterization

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“…The NP Al specific surface area, as obtained by BET analysis, is nearly 73 m 2 g −1 , a remarkably large value that compares well with the highest literature values for NP metals [35,36]. Although limitations associated to surface area determination by physisorption routes have been reported, the correlation with the structural features has been pointed out [35][36][37]. For instance, NP Au can have a specific surface area as large as 85 m 2 g −1 when its ligaments are about 7 nm in size [35].…”

Section: Resultssupporting

confidence: 85%

“…The shape of the N 2 physisorption isotherms shown in Figure 3b is associated with the occurrence of a hysteresis loop and does not strictly match with a specific classification, supporting the NP Al structure's inhomogeneity [34]. The NP Al specific surface area, as obtained by BET analysis, is nearly 73 m 2 g −1 , a remarkably large value that compares well with the highest literature values for NP metals [35,36]. Although limitations associated to surface area determination by physisorption routes have been reported, the correlation with the structural features has been pointed out [35][36][37].…”

Section: Resultsmentioning

confidence: 66%

“…Although limitations associated to surface area determination by physisorption routes have been reported, the correlation with the structural features has been pointed out [35][36][37]. For instance, NP Au can have a specific surface area as large as 85 m 2 g −1 when its ligaments are about 7 nm in size [35]. From pore volume evaluation, a porosity of 40% can be estimated, relative to those pores smaller than 300 nm.…”

Section: Resultsmentioning

confidence: 99%

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Fabrication of Nanoporous Al by Vapor-Phase Dealloying: Morphology Features, Mechanical Properties and Model Predictions

et al. 2021

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The physical and chemical properties shown by nanoporous metals, related to their unique structure, make them very promising for application in several fields. Recently, vapor-phase dealloying has been reported as a method for the preparation of several non-noble nanoporous metals, alternatively to dealloying in aqueous solutions. Using this approach, we have successfully fabricated nanoporous Al starting from an Al20Zn80 nanocomposite obtained by ball milling. The nanocomposite was annealed at 550 °C under high-vacuum conditions, and the difference in the vapor pressures allowed the selective removal of Zn by vapor-phase dealloying. The morphology of the resulting nanoporous material was analyzed by Scanning Electron Microscopy showing pores from few to thousands of nm; moreover, the nanoporous 3D structure was observed through Serial Block Face-Scanning Electron Microscopy. A specific surface area as high as 73 m2 g−1 was estimated by N2 physisorption measurements. In addition, a fractal model able to well reproduce the morphology of nanoporous Al was built. This model has been used for predicting mechanical properties which are in good agreement with experimental data obtained by nanoindentation.

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“…Thus, the specific (per volume, V S , of the solid) surface area, S V = A/V S , is a natural microstructural parameter in studies of coarsening at conserved volume [29,44]. This parameter is also routinely determined in experiments on NPG [9,45,46]. In our study, the surface reconstruction algorithm of Ref.…”

Section: Extracting Ligament Size and Connectivitymentioning

confidence: 98%

Topology evolution during coarsening of nanoscale metal network structures

Ngô

Markmann

et al. 2019

Phys. Rev. Materials

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Many experiments exploit curvature-driven, surface-diffusion-mediated coarsening for tuning the characteristic structure size of metal network structures made by dealloying, such as nanoporous gold. Here we study this process by kinetic Monte Carlo simulation. The initial microstructures are leveled Gaussian random fields, approximating spinodally decomposed mixtures, of different solid fraction ϕ. Earlier work establishes these structures as valid representations of the nanoporous gold microstructure. We find that the coarsening law for the characteristic spacing between the ligaments of the network is universal, whereas the time evolution of the characteristic ligament diameter is not. The expected time exponent 1/4 is confirmed by our simulation. Contrary to what may be expected based on continuum models, the degree of surface faceting or roughness has no apparent effect on the coarsening kinetics. In the time interval of our study, the network connectivity-as measured by a scaled density of topological genus-remains sensibly invariant for networks with ϕ 0.3, consistent with previous reports of a self-similar evolution of the microstructure during coarsening. Yet, networks with lesser ϕ lose their connectivity on coarsening and can even undergo a percolation-to-cluster transition. This process is slow for ϕ only little below 0.3 and it accelerates in networks with lesser ϕ. The dependency of the connectivity evolution on ϕ may explain controversial findings on the microstructure evolution of nanoporous gold in experimental studies.

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Surface area of nanoporous gold: Effect on temperature

Cited by 16 publications

References 41 publications

Microstructure characterization by X-ray tomography and EBSD of porous FeCr produced by liquid metal dealloying

Microstructure characterization by X-ray tomography and EBSD of porous FeCr produced by liquid metal dealloying

Fabrication of Nanoporous Al by Vapor-Phase Dealloying: Morphology Features, Mechanical Properties and Model Predictions

Topology evolution during coarsening of nanoscale metal network structures

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