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Article

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

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Dipartimento di Ingegneria Meccanica, Chimica e dei Materiali, Università degli Studi di Cagliari, Piazza d’Armi, 09123 Cagliari, Italy
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Consorzio Sistemi a Grande Interfase (CSGI), Department of Chemistry, University of Florence, via della Lastruccia 3, 50019 Sesto Fiorentino, Italy
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Cagliari Research Unit, via Marengo 2, 09123 Cagliari, Italy
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NABLA Lab, Biological and Environmental Sciences and Engineering (BESE) Division, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
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Dipartimento di Fisica, Università degli Studi di Milano, via Celoria 16, 20131 Milano, Italy
*
Authors to whom correspondence should be addressed.
Academic Editor: Karol Ćwieka
Appl. Sci. 2021, 11(14), 6639; https://doi.org/10.3390/app11146639
Received: 29 June 2021 / Revised: 13 July 2021 / Accepted: 16 July 2021 / Published: 20 July 2021
(This article belongs to the Special Issue Porous Materials: Design, Characterization, and Applications)
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. View Full-Text
Keywords: nanoporous metals; nanocomposites; aluminum; dealloying; mechanical properties; fractal model nanoporous metals; nanocomposites; aluminum; dealloying; mechanical properties; fractal model
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MDPI and ACS Style

Pinna, A.; Pia, G.; Casula, M.F.; Delogu, F.; Sogne, E.; Falqui, A.; Pilia, L. Fabrication of Nanoporous Al by Vapor-Phase Dealloying: Morphology Features, Mechanical Properties and Model Predictions. Appl. Sci. 2021, 11, 6639. https://doi.org/10.3390/app11146639

AMA Style

Pinna A, Pia G, Casula MF, Delogu F, Sogne E, Falqui A, Pilia L. Fabrication of Nanoporous Al by Vapor-Phase Dealloying: Morphology Features, Mechanical Properties and Model Predictions. Applied Sciences. 2021; 11(14):6639. https://doi.org/10.3390/app11146639

Chicago/Turabian Style

Pinna, Andrea, Giorgio Pia, Maria F. Casula, Francesco Delogu, Elisa Sogne, Andrea Falqui, and Luca Pilia. 2021. "Fabrication of Nanoporous Al by Vapor-Phase Dealloying: Morphology Features, Mechanical Properties and Model Predictions" Applied Sciences 11, no. 14: 6639. https://doi.org/10.3390/app11146639

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