Evolution of Nanoporosity in Dealloying

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dc.creatorErlebacher, Jonah
dc.creatorAziz, Michael J.
dc.creatorKarma, Alain
dc.creatorDimitrov, Nikolay
dc.creatorSieradzki, Karl
dc.date2001-03-29
dc.date.accessioned2026-07-07T02:40:55Z
dc.date.available2026-07-07T02:40:55Z
dc.descriptionDealloying is a common corrosion process during which an alloy is "parted" by the selective dissolution of the electrochemically more active elements. This process results in the formation of a nanoporous sponge composed almost entirely of the more noble alloy constituents . Even though this morphology evolution problem has attracted considerable attention, the physics responsible for porosity evolution have remained a mystery . Here we show by experiment, lattice computer simulation, and a continuum model, that nanoporosity is due to an intrinsic dynamical pattern formation process - pores form because the more noble atoms are chemically driven to aggregate into two-dimensional clusters via a spinodal decomposition process at the solid-electrolyte interface. At the same time, the surface area continuously increases due to etching. Together, these processes evolve a characteristic length scale predicted by our continuum model. The applications potential of nanoporous metals is enormous. For instance, the high surface area of nanoporous gold made by dealloying Ag-Au can be chemically tailored, making it suitable for sensor applications, particularly in biomaterials contexts.
dc.description13 pages, PDF, incl. 4 figures. avi movies of simulations available at http://www.deas.harvard.edu/matsci/downdata/downdata.html
dc.identifierhttps://arxiv.org/abs/cond-mat/0103615
dc.identifierhttp://arxiv.org/abs/cond-mat/0103615
dc.identifierNature 410 (2001) 450-453
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/17548
dc.subjectMaterials Science
dc.titleEvolution of Nanoporosity in Dealloying
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