Modeling the Potential Distribution in Porous Anodic Alumina Films during Steady-State Growth

dc.contributor.author Houser, Jerrod
dc.contributor.author Hebert, Kurt
dc.contributor.author Hebert, Kurt R
dc.contributor.department Chemical and Biological Engineering
dc.date 2018-02-13T21:03:20.000
dc.date.accessioned 2020-06-30T01:10:36Z
dc.date.available 2020-06-30T01:10:36Z
dc.date.copyright Sun Jan 01 00:00:00 UTC 2006
dc.date.embargo 2014-02-10
dc.date.issued 2006-01-01
dc.description.abstract <p>Porous anodic alumina (PAA) films, formed by anodic oxidation in acidic solutions, contain hexagonal arrays of parallel cylindrical pores, with pore diameter and spacing between ten and several hundred nanometers. Simulations were developed for the electrical potential distribution in the film during steady-state PAA growth, and used to calculate the rates of metal-film and film-solution interface motion. In particular, a model using the assumption of no space charge (Laplace’s equation) and one based on the current continuity equation, in each case coupled with high-field ionic conduction, were evaluated with respect to the requirement that the interface profiles are time invariant. Laplace’s equation, on which prior simulations of PAA growth were based, yielded unrealistic behavior with highly nonuniform interface motion, suggesting the presence of significant space charge. In contrast, interface motion predicted by the current continuity equation was uniform, except near convex ridges on the metal-film interface between pores. To fully rationalize the steady-state PAA geometry, phenomena other than conduction should be considered, which are able to provide inhibition of the oxidation rate on these ridges.</p>
dc.description.comments <p>This article is from <em>Journal of the Electrochemical Society</em> 153 (2006): B566–B573, doi:<a href="http://dx.doi.org/10.1149/1.2360763" target="_blank">10.1149/1.2360763</a>. Posted with permission.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/cbe_pubs/51/
dc.identifier.articleid 1052
dc.identifier.contextkey 5094587
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath cbe_pubs/51
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/13550
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/cbe_pubs/51/2006_HouserJE_ModelingPotentialDistribution.pdf|||Sat Jan 15 00:42:53 UTC 2022
dc.source.uri 10.1149/1.2360763
dc.subject.disciplines Chemical Engineering
dc.subject.keywords alumina
dc.subject.keywords porous materials
dc.subject.keywords thin films
dc.subject.keywords anodisation
dc.subject.keywords electric potential
dc.subject.keywords Laplace equations
dc.subject.keywords ionic conductivity
dc.subject.keywords metal-insulator boundaries
dc.title Modeling the Potential Distribution in Porous Anodic Alumina Films during Steady-State Growth
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isAuthorOfPublication 1c209ea4-85ad-49b9-aebd-14873e016053
relation.isOrgUnitOfPublication 86545861-382c-4c15-8c52-eb8e9afe6b75
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