Nanoporous and Nanocomposite Materials by Dealloying

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

Deadline for manuscript submissions: closed (30 April 2021) | Viewed by 8625

Special Issue Editors


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Guest Editor
University of Bremen (Germany), Leibniz Institute for Materials Engineering - IWT Bremen, Badgasteiner Street 3, 28359 Bremen, Germany
Interests: liquid metal dealloying; additive manufacturing; surface functionalization; nanoporous materials; metal-polymer composites; biomedical materials; high-entropy alloys; metallic glasses; metal matrix composites; bicontinuous materials; permanent magnets; titanium alloys; mechanical behavior and deformation mechanism

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Co-Guest Editor
Department of Materials Science and Engineering, Dankook University, 119 Dandae-ro, Cheonan 31116, Korea
Interests: liquid metal dealloying; nanoporous structure; high-entropy alloy; 3D interconnected composite; mechanical behavior and deformation mechanism

Special Issue Information

Nanoporous materials synthesized by dealloying continue to gain enormous research interest due to their outstanding physical properties covering the broad application spectrum, including energy storage, catalysis, sensing, actuation, etc., to list a few. This becomes possible due to several factors, particularly the improved analytical capabilities as well as development of novel synthesis methods, such as liquid metal dealloying and vapor dealloying. The improved analytical capabilities play a crucial role because nanoporous materials are a three-dimensional structure of randomly interpenetrating ligaments/nanopores with typical sizes from a few nm to several tenth of microns. Novel dealloying methods broaden the spectrum of nanoporous materials toward more reactive, such as magnesium, and more compositionally complex materials, such as high-entropy alloys.

This Special Issue focuses on recent advances in nanoporous materials from theoretical insights to experimental aspects covering design, synthesis, processing, and application. We welcome contributions from experimentalists, theorists, and computational scientists in this research field.

Assoc. Prof. Dr.-Ing. Ilya Okulov
Assist. Prof. Dr. Soo-Hyun Joo
Guest Editors

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Keywords

  • Dealloying
  • Liquid metal dealloying
  • Vapor dealloying
  • Nanoporous materials
  • Composite materials
  • Biomedical materials
  • Compositionally complex materials
  • Magnets
  • Energy storage materials
  • Catalysts
  • Battery
  • Mechanical behavior
  • Additive manufacturing

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Published Papers (2 papers)

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Research

11 pages, 3670 KiB  
Article
Open Porous α + β Titanium Alloy by Liquid Metal Dealloying for Biomedical Applications
by Stefan Alexander Berger and Ilya Vladimirovich Okulov
Metals 2020, 10(11), 1450; https://doi.org/10.3390/met10111450 - 29 Oct 2020
Cited by 23 | Viewed by 2836
Abstract
Open porous dendrite-reinforced TiMo alloy was synthesized by liquid metal dealloying of the precursor Ti47.5Mo2.5Cu50 (at.%) alloy in liquid magnesium (Mg). The porous TiMo alloy consists of α-titanium and β-titanium phases and possesses a complex microstructure. The microstructure [...] Read more.
Open porous dendrite-reinforced TiMo alloy was synthesized by liquid metal dealloying of the precursor Ti47.5Mo2.5Cu50 (at.%) alloy in liquid magnesium (Mg). The porous TiMo alloy consists of α-titanium and β-titanium phases and possesses a complex microstructure. The microstructure consists of micrometer scale β-titanium dendrites surrounded by submicrometer scale α-titanium ligaments. Due to the dendrite-reinforced microstructure, the porous TiMo alloy possesses relatively high yield strength value of up to 180 MPa combined with high deformability probed under compression loading. At the same time, the elastic modulus of the porous TiMo alloy (below 10 GPa) is in the range of that found for human bone. This mechanical behavior along with the open porous structure is attractive for biomedical applications and suggests opportunities for using the porous TiMo alloy in implant applications. Full article
(This article belongs to the Special Issue Nanoporous and Nanocomposite Materials by Dealloying)
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7 pages, 2775 KiB  
Article
Nanoporous High-Entropy Alloy by Liquid Metal Dealloying
by Artem Vladimirovich Okulov, Soo-Hyun Joo, Hyoung Seop Kim, Hidemi Kato and Ilya Vladimirovich Okulov
Metals 2020, 10(10), 1396; https://doi.org/10.3390/met10101396 - 21 Oct 2020
Cited by 33 | Viewed by 5145
Abstract
High-entropy nanomaterials possessing high accessible surface areas have demonstrated outstanding catalytic performance, beating that found for noble metals. In this communication, we report about the synthesis of a new, nanoporous, high-entropy alloy (HEA) possessing open porosity. The nanoporous, high-entropy Ta19.1Mo20.5 [...] Read more.
High-entropy nanomaterials possessing high accessible surface areas have demonstrated outstanding catalytic performance, beating that found for noble metals. In this communication, we report about the synthesis of a new, nanoporous, high-entropy alloy (HEA) possessing open porosity. The nanoporous, high-entropy Ta19.1Mo20.5Nb22.9V30Ni7.5 alloy (at%) was fabricated from a precursor (TaMoNbV)25Ni75 alloy (at%) by liquid metal dealloying using liquid magnesium (Mg). Directly after dealloying, the bicontinuous nanocomposite consisting of a Mg-rich phase and a phase with a bulk-centered cubic (bcc) structure was formed. The Mg-rich phase was removed with a 3M aqueous solution of nitric acid to obtain the open, porous, high-entropy Ta19.1Mo20.5Nb22.9V30Ni7.5 alloy (at%). The ligament size of this nanoporous HEA is about 69 ± 9 nm, indicating the high surface area in this material. Full article
(This article belongs to the Special Issue Nanoporous and Nanocomposite Materials by Dealloying)
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