Title:
Shape preserving conversion reaction of siliceous structures using metal halides: properties, kinetics, and potential applications

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dc.contributor.advisor Sandhage, Kenneth H.
dc.contributor.author Shian, Samuel en_US
dc.contributor.committeeMember Cochran, Joe K.
dc.contributor.committeeMember Liu, Meilin
dc.contributor.committeeMember Robert L. Snyder
dc.contributor.committeeMember Sankar Nair
dc.contributor.department Materials Science and Engineering en_US
dc.date.accessioned 2011-03-04T21:01:25Z
dc.date.available 2011-03-04T21:01:25Z
dc.date.issued 2008-11-07 en_US
dc.description.abstract BaSIC, which stands for Bioclastic and Shape-preserving Inorganic Conversion, is shape-preserving chemical conversion process of biological (or man-made) silica structures for producing complex 3-D microscale structures. This dissertation reports the BaSIC reaction of halide gases (i.e., TiF4, ZrF4, and ZrCl4) with 3-D silica structures, (i.e., diatom frustules, silicified direct-write assembly scaffolds, and Stöber silica spheres) to produce titania and zirconia replicas of the original 3-D structures. The kinetics of reaction of silica with titanium tetrafluoride gas is analyzed by using a novel HTXRD reaction chamber, nitrogen adsorption, and transmission electron microscope (TEM). The crystal structure and the temperature-induced phase transformation (from the room temperature hexagonal R-3c structure to the higher temperature cubic Pm3m structure) of polycrystalline TiOF2 that was synthesized through metathetic reaction of silica with TiF4(g) is reported. Additionally, potential applications of the converted titania diatom frustules (i.e., as a fast micron-sized ethanol sensor, and as a pesticide hydrolyzing agent) are also demonstrated in this work. en_US
dc.description.degree Ph.D. en_US
dc.identifier.uri http://hdl.handle.net/1853/37252
dc.publisher Georgia Institute of Technology en_US
dc.subject Anatase catalyst en_US
dc.subject Gas sensor en_US
dc.subject High temperature x-ray diffraction en_US
dc.subject Diatom microshell en_US
dc.subject Gas-solid reaction kinetics en_US
dc.subject Titanium oxyfluoride en_US
dc.subject.lcsh Silica
dc.subject.lcsh Diatoms Frustules
dc.subject.lcsh Halides
dc.subject.lcsh Self-assembly (Chemistry)
dc.title Shape preserving conversion reaction of siliceous structures using metal halides: properties, kinetics, and potential applications en_US
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
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