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- Title
Topological control of liquid-metal-dealloyed structures.
- Authors
Lai, Longhai; Gaskey, Bernard; Chuang, Alyssa; Erlebacher, Jonah; Karma, Alain
- 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. Liquid metal dealloying is a method to fabricate bicontinuous composite structures with ultra-high interfacial area for diverse applications. This paper demonstrates how the topology of those structures can be controlled by the choice of melt composition.
- Subjects
LIQUID metals; METALS; COMPOSITE structures; HIGH temperatures; TOPOLOGY
- Publication
Nature Communications, 2022, Vol 13, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-022-30483-5