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Three-Dimensional Morphological and Chemical Evolution of Nanoporous Stainless Steel by Liquid Metal Dealloying
journal contribution
posted on 2017-09-04, 00:00 authored by Chonghang Zhao, Takeshi Wada, Vincent De Andrade, Garth J. Williams, Jeff Gelb, Li Li, Juergen Thieme, Hidemi Kato, Yu-chen Karen Chen-WiegartNanoporous materials,
especially those fabricated by liquid metal dealloying processes,
possess great potential in a wide range of applications due to their
high surface area, bicontinuous structure with both open pores for
transport and solid phase for conductivity or support, and low material
cost. Here, we used X-ray nanotomography and X-ray fluorescence microscopy
to reveal the three-dimensional (3D) morphology and elemental distribution
within materials. Focusing on nanoporous stainless steel, we evaluated
the 3D morphology of the dealloying front and established a quantitative
processing–structure–property relationship at a later
stage of dealloying. The morphological differences of samples created
by liquid metal dealloying and aqueous dealloying methods were also
discussed. We concluded that it is particularly important to consider
the dealloying, coarsening, and densification mechanisms in influencing
the performance-determining, critical 3D parameters, such as tortuosity,
pore size, porosity, curvature, and interfacial shape.
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metal dealloying processessurface areapore sizeChemical Evolution3 D parametersNanoporous Stainless Steeldealloying front3 D morphologyX-ray nanotomographydensification mechanismsX-ray fluorescence microscopyLiquid Metal Dealloying Nanoporous materialsmetal dealloyingdealloying methodsmaterial costbicontinuous structureThree-Dimensional Morphological
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