Shape preserving conversion reactions of alumina structures using metal halides: Structures, kinetics, and applications

Shapero, Taylor McLachlan

Title:

Shape preserving conversion reactions of alumina structures using metal halides: Structures, kinetics, and applications

dc.contributor.advisor	Sandhage, Kenneth H.
dc.contributor.author	Shapero, Taylor McLachlan
dc.contributor.committeeMember	Bottomley, Lawrence
dc.contributor.committeeMember	Garmestani, Hamid
dc.contributor.committeeMember	Liu, Meilin
dc.contributor.committeeMember	Singh, Preet
dc.contributor.department	Materials Science and Engineering
dc.date.accessioned	2017-08-17T18:55:17Z
dc.date.available	2017-08-17T18:55:17Z
dc.date.created	2016-08
dc.date.issued	2016-05-05
dc.date.submitted	August 2016
dc.date.updated	2017-08-17T18:55:17Z
dc.description.abstract	Porous anodic aluminum oxide nanostructures provide hexagonally ordered arrays of pores with periodic distribution and tunable size and length. The research in this dissertation introduces a new process for partially converting the chemistry of the aluminum oxide nanostructure to titanium dioxide while retaining shape through a gaseous metal halide (TiF4) reactive conversion process. By this process, oriented single and multi-wall titania nanotube arrays with tailored structures can be formed. This vapor-based process allows titania formation within small pores inaccessible to liquid-based approaches through an intermediary TiOF2 product. The research explores applications of converted titania structures, including dye-sensitized solar cells. The reactive conversion kinetics of Al2O3 into TiOF2 was studied to reveal two kinetic regimes likely limited by chemical reaction and solid-state diffusion allowing a stronger understanding of how the conversion reaction might be optimized in future applications. Other metal fluoride reactions with anodic aluminum oxide (Al2O3) are also studied (including the successful conversion of Al2O3 into Nb2O5) showing the versatility of converting anodic aluminum oxide for applications requiring certain other oxide materials.
dc.description.degree	Ph.D.
dc.format.mimetype	application/pdf
dc.identifier.uri	http://hdl.handle.net/1853/58554
dc.language.iso	en_US
dc.publisher	Georgia Institute of Technology
dc.subject	Porous anodic alumina
dc.subject	Titanium oxyfluoride
dc.subject	Halides
dc.subject	Titanium dioxide
dc.subject	Nanotube arrays
dc.subject	High temperature x-ray diffraction
dc.title	Shape preserving conversion reactions of alumina structures using metal halides: Structures, kinetics, and applications
dc.type	Text
dc.type.genre	Dissertation
dspace.entity.type	Publication
local.contributor.corporatename	School of Materials Science and Engineering
local.contributor.corporatename	College of Engineering
relation.isOrgUnitOfPublication	21b5a45b-0b8a-4b69-a36b-6556f8426a35
relation.isOrgUnitOfPublication	7c022d60-21d5-497c-b552-95e489a06569
thesis.degree.level	Doctoral