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Topology-generating interfacial pattern formation during liquid metal dealloying.

Pierre-Antoine Geslin1, Ian McCue2, Bernard Gaskey2

  • 1Physics Department and Center for Interdisciplinary Research on Complex Systems, Northeastern University, Boston, Massachusetts 02115, USA.

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|November 20, 2015
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Summary

Liquid metal dealloying creates complex nanoporous structures through selective dissolution. This study reveals pattern formation arises from spinodal decomposition and diffusion-coupled growth, explaining diverse structure generation.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Computational Materials Science

Background:

  • Liquid metal dealloying (LMD) is a promising technique for creating advanced nanoporous and nanocomposite materials.
  • These materials possess ultra-high interfacial areas and unique properties suitable for various applications.
  • The fundamental mechanisms governing structure formation during LMD are not yet fully understood.

Purpose of the Study:

  • To elucidate the underlying mechanisms of nano/microstructural pattern formation during liquid metal dealloying.
  • To explain the generation of diverse topologically complex structures.
  • To establish scaling laws for microstructural length scales and dealloying kinetics.

Main Methods:

  • Mesoscale phase-field modeling was employed to simulate the dealloying process.
  • Experimental validation was conducted to support the simulation results.
  • Analysis focused on the interplay between interfacial spinodal decomposition and diffusion-coupled growth.

Main Results:

  • Nano/microstructural patterns form due to the combined effects of interfacial spinodal decomposition and diffusion-coupled growth.
  • Interfacial spinodal decomposition creates compositional domains enriched in the immiscible element.
  • Diffusion-coupled growth of solid and liquid phases dictates the evolution of these domains, yielding varied structures.

Conclusions:

  • The study reveals two fundamental mechanisms driving structure formation in liquid metal dealloying.
  • These mechanisms explain the formation of both topologically disconnected and connected nanoporous structures.
  • The research provides insights into controlling dealloying kinetics and microstructural length scales.