Topological control of liquid-metal-dealloyed structures

Lai, Longhai; Gaskey, Bernard; Chuang, Alyssa; Erlebacher, Jonah; Karma, Alain

doi:10.1038/s41467-022-30483-5

Topological control of liquid-metal-dealloyed structures

Journal Article · Wed May 25 00:00:00 EDT 2022 · Nature Communications

DOI:https://doi.org/10.1038/s41467-022-30483-5· OSTI ID:1869733

Lai, Longhai; Gaskey, Bernard; Chuang, Alyssa; Erlebacher, Jonah;

Abstract

The past few years have witnessed the rapid development of liquid metal dealloying to fabricate nano-/meso-scale porous and composite structures with ultra-high interfacial area for diverse materials applications. However, this method currently has two important limitations. First, it produces bicontinuous structures with high-genus topologies for a limited range of alloy compositions. Second, structures have a large ligament size due to substantial coarsening during dealloying at high temperature. Here we demonstrate computationally and experimentally that those limitations can be overcome by adding to the metallic melt an element that promotes high-genus topologies by limiting the leakage of the immiscible element during dealloying. We further interpret this finding by showing that bulk diffusive transport of the immiscible element in the liquid melt strongly influences the evolution of the solid fraction and topology of the structure during dealloying. The results shed light on fundamental differences in liquid metal and electrochemical dealloying and establish a new approach to produce liquid-metal-dealloyed structures with desired size and topologies.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: FG02-07ER46400

OSTI ID:: 1869733

Alternate ID(s):: OSTI ID: 1906279

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 13; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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