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Title: Topology-generating interfacial pattern formation during liquid metal dealloying

Liquid metal dealloying has emerged as a novel technique to produce topologically complex nanoporous and nanocomposite structures with ultra-high interfacial area and other unique properties relevant for diverse material applications. This process is empirically known to require the selective dissolution of one element of a multicomponent solid alloy into a liquid metal to obtain desirable structures. However, how structures form is not known. Here we demonstrate, using mesoscale phase-field modelling and experiments, that nano/microstructural pattern formation during dealloying results from the interplay of (i) interfacial spinodal decomposition, forming compositional domain structures enriched in the immiscible element, and (ii) diffusion-coupled growth of the enriched solid phase and the liquid phase into the alloy. We highlight how those two basic mechanisms interact to yield a rich variety of topologically disconnected and connected structures. Furthermore, we deduce scaling laws governing microstructural length scales and dealloying kinetics.
Authors:
 [1] ;  [2] ;  [2] ;  [2] ;  [1]
  1. Northeastern Univ., Boston, MA (United States)
  2. Johns Hopkins Univ., Baltimore, MD (United States)
Publication Date:
Grant/Contract Number:
FG02-07ER46400
Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 6; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Research Org:
Northeastern Univ., Boston, MA (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; 36 MATERIALS SCIENCE; physical sciences; materials science
OSTI Identifier:
1239972

Geslin, Pierre -Antoine, McCue, Ian, Gaskey, Bernard, Erlebacher, Jonah, and Karma, Alain. Topology-generating interfacial pattern formation during liquid metal dealloying. United States: N. p., Web. doi:10.1038/ncomms9887.
Geslin, Pierre -Antoine, McCue, Ian, Gaskey, Bernard, Erlebacher, Jonah, & Karma, Alain. Topology-generating interfacial pattern formation during liquid metal dealloying. United States. doi:10.1038/ncomms9887.
Geslin, Pierre -Antoine, McCue, Ian, Gaskey, Bernard, Erlebacher, Jonah, and Karma, Alain. 2015. "Topology-generating interfacial pattern formation during liquid metal dealloying". United States. doi:10.1038/ncomms9887. https://www.osti.gov/servlets/purl/1239972.
@article{osti_1239972,
title = {Topology-generating interfacial pattern formation during liquid metal dealloying},
author = {Geslin, Pierre -Antoine and McCue, Ian and Gaskey, Bernard and Erlebacher, Jonah and Karma, Alain},
abstractNote = {Liquid metal dealloying has emerged as a novel technique to produce topologically complex nanoporous and nanocomposite structures with ultra-high interfacial area and other unique properties relevant for diverse material applications. This process is empirically known to require the selective dissolution of one element of a multicomponent solid alloy into a liquid metal to obtain desirable structures. However, how structures form is not known. Here we demonstrate, using mesoscale phase-field modelling and experiments, that nano/microstructural pattern formation during dealloying results from the interplay of (i) interfacial spinodal decomposition, forming compositional domain structures enriched in the immiscible element, and (ii) diffusion-coupled growth of the enriched solid phase and the liquid phase into the alloy. We highlight how those two basic mechanisms interact to yield a rich variety of topologically disconnected and connected structures. Furthermore, we deduce scaling laws governing microstructural length scales and dealloying kinetics.},
doi = {10.1038/ncomms9887},
journal = {Nature Communications},
number = ,
volume = 6,
place = {United States},
year = {2015},
month = {11}
}