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Metals
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Nanoporous Metallic Alloys
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Nanoporous Metallic Alloys

A special issue of Metals (ISSN 2075-4701).

Deadline for manuscript submissions: closed (30 June 2015) | Viewed by 20154

Special Issue Editors

Prof. Dr. Eva Pellicer

E-Mail Website
Guest Editor
Departament de Física, Universitat Autonoma de Barcelona, 08193 Bellaterra, Barcelona, Spain
Interests: electrodeposition; alloys; mesoporous films; electrocatalysis; magnetic properties
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Jordi Sort

E-Mail Website
Guest Editor
Institució Catalana de Recerca i Estudis Avançats (ICREA) and Departament de Física, Universitat Autònoma de Barcelona, E-08193 Bellaterra, Spain
Interests: metallic alloys; composite materials; nanomaterials; biomaterials; thin films; nanoporous materials; surface treatments; mechanical performance; magnetism
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Nanoporous metallic alloys exhibit a wealth of intriguing properties compared to bulk fully-dense materials. Their ultra-high surface area−to−volume ratio, together with their low density and the possibility of hosting second-phase materials inside the porous frameworks, make these alloys useful for widespread technological applications that range from catalysts, filters, fuel cells or batteries to sophisticated platforms for drug delivery or biological labeling. The mechanical properties of these alloys (high elastic recovery, low Young’s modulus, ultra-high yield strain) foster additional functionalities for these materials, such as orthopedic implants with optimum biomechanical compatibility or nanoporous impact damper coatings with enhanced shock-resistance. This Special Issue welcomes contributions dealing with innovative strategies for synthesizing macro- (pore size > 50 nm), meso- (2 nm < pore size < 50 nm) and microporous (pore size < 2 nm) metallic alloys, such as via electrodeposition (by colloidal crystal and block-copolymer templating or by using hydrogen bubbling as a dynamic source of porosity), de-alloying, and sol-gel or nanosmelting (amongst others). Special emphases will be given to studies focusing on the control of the pore architecture, pore size distribution, and composition of the synthesized materials. Furthermore, experimental and theoretical reports that shed light on the interesting features of nanoporous metallic systems and their applications, as well as on advanced and innovative techniques for fully characterizing these type of materials, also fall within the scope of this Special Issue.

Dr. Eva Pellicer
Prof. Dr. Jordi Sort
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Metals is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • nanoporous alloys
  • metallic foams
  • metallic aerogels
  • porosity

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Published Papers (3 papers)

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Research

1754 KiB  
Article
Mechanical Properties of Nanoporous Au: From Empirical Evidence to Phenomenological Modeling
by Giorgio Pia and Francesco Delogu
Metals 2015, 5(3), 1665-1694; https://doi.org/10.3390/met5031665 - 16 Sep 2015
Cited by 13 | Viewed by 6065
Abstract
The present work focuses on the development of a theoretical model aimed at relating the mechanical properties of nanoporous metals to the bending response of thick ligaments. The model describes the structure of nanoporous metal foams in terms of an idealized regular lattice [...] Read more.
The present work focuses on the development of a theoretical model aimed at relating the mechanical properties of nanoporous metals to the bending response of thick ligaments. The model describes the structure of nanoporous metal foams in terms of an idealized regular lattice of massive cubic nodes and thick ligaments with square cross-sections. Following a general introduction to the subject, model predictions are compared with Young’s modulus and the yield strength of nanoporous Au foams determined experimentally and available in literature. It is shown that the model provides a quantitative description of the elastic and plastic deformation behavior of nanoporous metals, reproducing to a satisfactory extent the experimental Young’s modulus and yield strength values of nanoporous Au. Full article
(This article belongs to the Special Issue Nanoporous Metallic Alloys)
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1175 KiB  
Article
Thermal Stability of Nanoporous Raney Gold Catalyst
by Matthew C. Tai, Angus Gentle, Kaludewa Sujeewa B. De Silva, Matthew D. Arnold, Elma Van der Lingen and Michael B. Cortie
Metals 2015, 5(3), 1197-1211; https://doi.org/10.3390/met5031197 - 7 Jul 2015
Cited by 12 | Viewed by 6277
Abstract
Nanoporous “Raney gold” sponge was prepared by de-alloying an Au-Al precursor alloy. Catalytic tests using a micro-reactor confirmed that Raney gold can serve as an active heterogeneous catalyst for CO oxidation, reduction of NO to N2, and oxidation of NO to [...] Read more.
Nanoporous “Raney gold” sponge was prepared by de-alloying an Au-Al precursor alloy. Catalytic tests using a micro-reactor confirmed that Raney gold can serve as an active heterogeneous catalyst for CO oxidation, reduction of NO to N2, and oxidation of NO to NO2. In general, the specific surface area of a heterogeneous catalyst has an influence on its catalytic efficacy. Unfortunately, gold sponges coarsen readily, leading to sintering of their structure and reduction in surface area. This potentially places constraints on their upper operating temperature in catalytic reactors. Here we analyzed the behavior of Raney gold when the temperature was raised. We examined the kinetics and mechanism of coarsening of the sponge using a combination of in situ optical measurements and Metropolis Monte Carlo modeling with a Lennard-Jones interatomic potential. Modeling showed that the sponges started with an isotropic “foamy” morphology with negative average “mean curvature” but that subsequent thermally activated coarsening will drive the morphology through a bi-continuous fibrous state and on, eventually, to a sponge consisting of sintered blobs of predominantly positive “mean curvature”. Full article
(This article belongs to the Special Issue Nanoporous Metallic Alloys)
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639 KiB  
Article
Measurement and Determination of Friction Characteristic of Air Flow through Porous Media
by Wei Zhong, Xin Li, Guoliang Tao and Toshiharu Kagawa
Metals 2015, 5(1), 336-349; https://doi.org/10.3390/met5010336 - 9 Mar 2015
Cited by 6 | Viewed by 7033
Abstract
Sintered metal porous media currently plays an important role in air bearing systems. When flowing through porous media, the flow properties are generally represented by incompressible Darcy-Forchheimer regime or Ergun regime. In this study, a modified Ergun equation, which includes air compressibility effects, [...] Read more.
Sintered metal porous media currently plays an important role in air bearing systems. When flowing through porous media, the flow properties are generally represented by incompressible Darcy-Forchheimer regime or Ergun regime. In this study, a modified Ergun equation, which includes air compressibility effects, is developed to describe friction characteristic. Experimental and theoretical investigations on friction characteristic are conducted with a series of metal-sintered porous media. Re = 10 is selected as the boundary for a viscous drag region and a form drag region. Experimental data are first used to determine the coefficient α in the viscous drag region, and then the coefficient β in the form drag region, rather than both simultaneously. Also, the theoretical mass flow rate in terms of the modified Ergun equation provides close approximations to the experimental data. Finally, it is also known that both the air compressibility and inertial effects can obviously enhance the pressure drop. Full article
(This article belongs to the Special Issue Nanoporous Metallic Alloys)
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