Evolution of nanoporosity in dealloying

Jonah Erlebacher, Michael J. Aziz, Alain Karma, Nikolay Dimitrov, Karl Sieradzki

Research output: Contribution to journalArticle

1845 Citations (Scopus)

Abstract

Dealloying is a common corrosion process during which an alloy is 'parted' by the selective dissolution of the most electrochemically active of its elements. This process results in the formation of a nanoporous sponge composed almost entirely of the more noble alloy constituents. Although considerable attention has been devoted to the morphological aspects of the dealloying process, its underlying physical mechanism has remained unclear. Here we propose a continuum model that is fully consistent with experiments and theoretical simulations of alloy dissolution, and demonstrate that nanoporosity in metals is due to an intrinsic dynamical pattern formation process. That is, pores form because the more noble atoms are chemically driven to aggregate into two-dimensional clusters by a phase separation process (spinodal decomposition) at the solid-electrolyte interface, and the surface area continuously increases owing to etching. Together, these processes evolve porosity with a characteristic length scale predicted by our continuum model. We expect that chemically tailored nanoporous gold made by dealloying Ag-Au should be suitable for sensor applications, particularly in a biomaterials context.

Original languageEnglish (US)
Pages (from-to)450-453
Number of pages4
JournalNature
Volume410
Issue number6827
DOIs
StatePublished - Mar 22 2001

Fingerprint

Corrosion
Porosity
Porifera
Biocompatible Materials
Gold
Electrolytes
Metals

ASJC Scopus subject areas

  • General

Cite this

Erlebacher, J., Aziz, M. J., Karma, A., Dimitrov, N., & Sieradzki, K. (2001). Evolution of nanoporosity in dealloying. Nature, 410(6827), 450-453. https://doi.org/10.1038/35068529

Evolution of nanoporosity in dealloying. / Erlebacher, Jonah; Aziz, Michael J.; Karma, Alain; Dimitrov, Nikolay; Sieradzki, Karl.

In: Nature, Vol. 410, No. 6827, 22.03.2001, p. 450-453.

Research output: Contribution to journalArticle

Erlebacher, J, Aziz, MJ, Karma, A, Dimitrov, N & Sieradzki, K 2001, 'Evolution of nanoporosity in dealloying', Nature, vol. 410, no. 6827, pp. 450-453. https://doi.org/10.1038/35068529
Erlebacher J, Aziz MJ, Karma A, Dimitrov N, Sieradzki K. Evolution of nanoporosity in dealloying. Nature. 2001 Mar 22;410(6827):450-453. https://doi.org/10.1038/35068529
Erlebacher, Jonah ; Aziz, Michael J. ; Karma, Alain ; Dimitrov, Nikolay ; Sieradzki, Karl. / Evolution of nanoporosity in dealloying. In: Nature. 2001 ; Vol. 410, No. 6827. pp. 450-453.
@article{3ce97531f02746ee8b7e6788cb9f563b,
title = "Evolution of nanoporosity in dealloying",
abstract = "Dealloying is a common corrosion process during which an alloy is 'parted' by the selective dissolution of the most electrochemically active of its elements. This process results in the formation of a nanoporous sponge composed almost entirely of the more noble alloy constituents. Although considerable attention has been devoted to the morphological aspects of the dealloying process, its underlying physical mechanism has remained unclear. Here we propose a continuum model that is fully consistent with experiments and theoretical simulations of alloy dissolution, and demonstrate that nanoporosity in metals is due to an intrinsic dynamical pattern formation process. That is, pores form because the more noble atoms are chemically driven to aggregate into two-dimensional clusters by a phase separation process (spinodal decomposition) at the solid-electrolyte interface, and the surface area continuously increases owing to etching. Together, these processes evolve porosity with a characteristic length scale predicted by our continuum model. We expect that chemically tailored nanoporous gold made by dealloying Ag-Au should be suitable for sensor applications, particularly in a biomaterials context.",
author = "Jonah Erlebacher and Aziz, {Michael J.} and Alain Karma and Nikolay Dimitrov and Karl Sieradzki",
year = "2001",
month = "3",
day = "22",
doi = "10.1038/35068529",
language = "English (US)",
volume = "410",
pages = "450--453",
journal = "Nature",
issn = "0028-0836",
publisher = "Nature Publishing Group",
number = "6827",

}

TY - JOUR

T1 - Evolution of nanoporosity in dealloying

AU - Erlebacher, Jonah

AU - Aziz, Michael J.

AU - Karma, Alain

AU - Dimitrov, Nikolay

AU - Sieradzki, Karl

PY - 2001/3/22

Y1 - 2001/3/22

N2 - Dealloying is a common corrosion process during which an alloy is 'parted' by the selective dissolution of the most electrochemically active of its elements. This process results in the formation of a nanoporous sponge composed almost entirely of the more noble alloy constituents. Although considerable attention has been devoted to the morphological aspects of the dealloying process, its underlying physical mechanism has remained unclear. Here we propose a continuum model that is fully consistent with experiments and theoretical simulations of alloy dissolution, and demonstrate that nanoporosity in metals is due to an intrinsic dynamical pattern formation process. That is, pores form because the more noble atoms are chemically driven to aggregate into two-dimensional clusters by a phase separation process (spinodal decomposition) at the solid-electrolyte interface, and the surface area continuously increases owing to etching. Together, these processes evolve porosity with a characteristic length scale predicted by our continuum model. We expect that chemically tailored nanoporous gold made by dealloying Ag-Au should be suitable for sensor applications, particularly in a biomaterials context.

AB - Dealloying is a common corrosion process during which an alloy is 'parted' by the selective dissolution of the most electrochemically active of its elements. This process results in the formation of a nanoporous sponge composed almost entirely of the more noble alloy constituents. Although considerable attention has been devoted to the morphological aspects of the dealloying process, its underlying physical mechanism has remained unclear. Here we propose a continuum model that is fully consistent with experiments and theoretical simulations of alloy dissolution, and demonstrate that nanoporosity in metals is due to an intrinsic dynamical pattern formation process. That is, pores form because the more noble atoms are chemically driven to aggregate into two-dimensional clusters by a phase separation process (spinodal decomposition) at the solid-electrolyte interface, and the surface area continuously increases owing to etching. Together, these processes evolve porosity with a characteristic length scale predicted by our continuum model. We expect that chemically tailored nanoporous gold made by dealloying Ag-Au should be suitable for sensor applications, particularly in a biomaterials context.

UR - http://www.scopus.com/inward/record.url?scp=0035932448&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0035932448&partnerID=8YFLogxK

U2 - 10.1038/35068529

DO - 10.1038/35068529

M3 - Article

VL - 410

SP - 450

EP - 453

JO - Nature

JF - Nature

SN - 0028-0836

IS - 6827

ER -