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Article: Simulation and experiment of substrate aluminium grain orientation dependent self-ordering in anodic porous alumina

TitleSimulation and experiment of substrate aluminium grain orientation dependent self-ordering in anodic porous alumina
Authors
KeywordsGrain and twin boundaries
Oxidation
Electrolytes
Powders, porous materials
Issue Date2013
PublisherAmerican Institute of Physics. The Journal's web site is located at http://jap.aip.org/jap/staff.jsp
Citation
Journal of Applied Physics, 2013, v. 113 n. 20, p. 204903 How to Cite?
AbstractRecent experiments have indicated a strong influence of the substrate grain orientation on the self-ordering in anodic porous alumina. Anodic porous alumina with straight pore channels grown in a stable, self-ordered manner is formed on (001) oriented Al grain, while disordered porous pattern is formed on (101) oriented Al grain with tilted pore channels growing in an unstable manner. In this work, numerical simulation of the pore growth process is carried out to understand this phenomenon. The rate-determining step of the oxide growth is assumed to be the Cabrera-Mott barrier at the oxide/electrolyte (o/e) interface, while the substrate is assumed to determine the ratio b between the ionization and oxidation reactions at the metal/oxide (m/o) interface. By numerically solving the electric field inside a growing porous alumina during anodization, the migration rates of the ions and hence the evolution of the o/e and m/o interfaces are computed. The simulated results show that pore growth is more stable when b is higher. A higher b corresponds to more Al ionized and migrating away from the m/o interface rather than being oxidized, and hence a higher retained O:Al ratio in the oxide. Experimentally measured oxygen content in the self-ordered porous alumina on (001) Al is indeed found to be about 3% higher than that in the disordered alumina on (101) Al, in agreement with the theoretical prediction. The results, therefore, suggest that ionization on (001) Al substrate is relatively easier than on (101) Al, and this leads to the more stable growth of the pore channels on (001) Al. VC 2013 AIP Publishing LLC.
Persistent Identifierhttp://hdl.handle.net/10722/183662
ISSN
2015 Impact Factor: 2.101
2015 SCImago Journal Rankings: 0.603
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorCheng, C-
dc.contributor.authorNg, KY-
dc.contributor.authorAluru, NR-
dc.contributor.authorNgan, AHW-
dc.date.accessioned2013-06-14T03:15:29Z-
dc.date.available2013-06-14T03:15:29Z-
dc.date.issued2013-
dc.identifier.citationJournal of Applied Physics, 2013, v. 113 n. 20, p. 204903-
dc.identifier.issn0021-8979-
dc.identifier.urihttp://hdl.handle.net/10722/183662-
dc.description.abstractRecent experiments have indicated a strong influence of the substrate grain orientation on the self-ordering in anodic porous alumina. Anodic porous alumina with straight pore channels grown in a stable, self-ordered manner is formed on (001) oriented Al grain, while disordered porous pattern is formed on (101) oriented Al grain with tilted pore channels growing in an unstable manner. In this work, numerical simulation of the pore growth process is carried out to understand this phenomenon. The rate-determining step of the oxide growth is assumed to be the Cabrera-Mott barrier at the oxide/electrolyte (o/e) interface, while the substrate is assumed to determine the ratio b between the ionization and oxidation reactions at the metal/oxide (m/o) interface. By numerically solving the electric field inside a growing porous alumina during anodization, the migration rates of the ions and hence the evolution of the o/e and m/o interfaces are computed. The simulated results show that pore growth is more stable when b is higher. A higher b corresponds to more Al ionized and migrating away from the m/o interface rather than being oxidized, and hence a higher retained O:Al ratio in the oxide. Experimentally measured oxygen content in the self-ordered porous alumina on (001) Al is indeed found to be about 3% higher than that in the disordered alumina on (101) Al, in agreement with the theoretical prediction. The results, therefore, suggest that ionization on (001) Al substrate is relatively easier than on (101) Al, and this leads to the more stable growth of the pore channels on (001) Al. VC 2013 AIP Publishing LLC.-
dc.languageeng-
dc.publisherAmerican Institute of Physics. The Journal's web site is located at http://jap.aip.org/jap/staff.jsp-
dc.relation.ispartofJournal of Applied Physics-
dc.rightsJournal of Applied Physics. Copyright © American Institute of Physics.-
dc.rightsAfter publication: Copyright (year) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in (citation of published article) and may be found at (URL/link for published article abstract). Before publication: The following article has been submitted to/accepted by [Name of Journal]. After it is published, it will be found at (URL/link to the entry page of the journal).-
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subjectGrain and twin boundaries-
dc.subjectOxidation-
dc.subjectElectrolytes-
dc.subjectPowders, porous materials-
dc.titleSimulation and experiment of substrate aluminium grain orientation dependent self-ordering in anodic porous aluminaen_US
dc.typeArticleen_US
dc.identifier.emailNg, KY: kycng@hku.hk-
dc.identifier.emailNgan, AHW: hwngan@hkucc.hku.hk-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1063/1.4807295-
dc.identifier.hkuros214605-
dc.identifier.volume113-
dc.identifier.issue20-
dc.identifier.spage204903-
dc.identifier.epage204903-
dc.identifier.isiWOS:000320132100083-
dc.publisher.placeUnited States-

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