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Influence of a Ceramic Substrate on Aqueous Precipitation and Structural Evolution of Alumina Nano-Crystalline Coatings

hal.structure.identifierMerck [Darmstadt]
dc.contributor.authorMAHÉ, Marie
hal.structure.identifierMerck [Darmstadt]
dc.contributor.authorREYNDERS, Peter
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorDEMOURGUES, Alain
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorHEINTZ, Jean-Marc
dc.date.issued2007
dc.identifier.issn0002-7820
dc.description.abstractEnEither boehmite (c-AlOOH) or gibbsite (c-Al(OH) 3) nanocrys-talline thin films (h% 100 nm) can be precipitated from AlCl 3 solution at fixed pH and temperature onto different substrates. It depends on the nature of the substrate (mica flakes, SiO 2 flakes, or a-Al 2 O 3 flakes), on their crystallographic properties (crystalline or amorphous), and on some experimental parameters (agitation rate, addition rate). According to the surface charge of the substrates, different alumina species are involved in the precipitation process. When negative charges are present on the substrate, the [Al 3 O(OH) 3 (OH 2) 9 ] 41 polycation is promoted , leading to the formation of the (Al 4) tetramer ([Al 4 O (OH) 10 (OH 2) 5 ] o) and then to the precipitation of bohemite. When positive charges are present, a ligand bridge containing complex ([Al 3 O(OH) 3 (O 2 H 3) 3 (OH 2) 9 ] 1) is likely favored, giving rise to hexagonal ring structures or amorphous solids that lead to the formation of gibbsite. Besides the surface effects, crystalline substrates can act as a template during precipitation of aluminum species as shown for the formation of gibbsite on muscovite. Finally, calcination at 8501C of boehmite samples leads to porous c-Al 2 O 3 layers, while calcination of gibbsite leads to d-Al 2 O 3 layers.
dc.language.isoen
dc.publisherWiley
dc.title.enInfluence of a Ceramic Substrate on Aqueous Precipitation and Structural Evolution of Alumina Nano-Crystalline Coatings
dc.typeArticle de revue
dc.identifier.doi10.1111/j.1551-2916.2006.01337.x
dc.subject.halChimie/Matériaux
bordeaux.journalJournal of the American Ceramic Society
bordeaux.page217-224
bordeaux.volume90
bordeaux.issue1
bordeaux.peerReviewedoui
hal.identifierhal-02981072
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02981072v1
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