Controlled ceramic porosity and membrane fabrication via alumoxane nanoparticles

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dc.contributor.advisorBarron, Andrew R.en_US
dc.creatorJones, Christopher Danielen_US
dc.date.accessioned2009-06-04T07:58:45Zen_US
dc.date.available2009-06-04T07:58:45Zen_US
dc.date.issued2000en_US
dc.description.abstractCarboxylate-alumoxanes, [Al(O)x(OH)y(O2CR) z]n, are organic substituted alumina nano-particles synthesized from boehmite in aqueous solution which are an inexpensive and environmentally-benign precursor for the fabrication of aluminum based ceramic bodies. The carboxylate-ligand on the alumoxane determines the morphology and the porosity of the derived alumina. Investigations of A-, MA-, MEA-, and MEEA-alumoxanes, were undertaken to determine the effects of these organic peripheries on the properties of the alumina at different sintering temperatures including the morphology, surface area, pore volume, pore size, pore size distribution, and crystal phase. The effects of physically or chemically mixing different carboxylate-alumoxanes were also investigated. The alumina derived from the thermolysis of the carboxylate-alumoxanes exhibits small pore diameters and narrow pore size distributions that are desirable for use in ceramic ultrafiltration membranes. In addition, it is possible to form alumina membranes with a range of pore sizes and porosity by changing the organic periphery. This lead to investigating the ability to produce asymmetric alumina filters with characteristics that at the lower end of the ultrafiltration range. The flux, permeability, molecular weight cut-off, roughness, and wettability of the asymmetric alumina membranes derived from carboxylate-alumoxanes are determined. Comparisons of these filters are made with commercially available filters. The ability to dope carboxylate-alumoxanes via a transmetallation reaction followed by thermolysis has previously shown to result in catalytically active alumina based materials. This lead to investigations into forming catalytically active membranes. Dip-coating aqueous solutions of the doped carboxylate-alumoxanes onto porous alumina supports, followed by thermolysis, resulted in the formation of doped-alumina asymmetric filters. In addition, a novel method to form surface-modified carboxylate-alumoxanes and their application as catalytic materials was determined.en_US
dc.format.extent173 p.en_US
dc.format.mimetypeapplication/pdfen_US
dc.identifier.callnoTHESIS M.E. 2000 JONESen_US
dc.identifier.citationJones, Christopher Daniel. "Controlled ceramic porosity and membrane fabrication via alumoxane nanoparticles." (2000) Diss., Rice University. <a href="https://hdl.handle.net/1911/19518">https://hdl.handle.net/1911/19518</a>.en_US
dc.identifier.urihttps://hdl.handle.net/1911/19518en_US
dc.language.isoengen_US
dc.rightsCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.en_US
dc.subjectInorganic chemistryen_US
dc.subjectChemical engineeringen_US
dc.subjectEngineeringen_US
dc.subjectMaterials scienceen_US
dc.titleControlled ceramic porosity and membrane fabrication via alumoxane nanoparticlesen_US
dc.typeThesisen_US
dc.type.materialTexten_US
thesis.degree.departmentMechanical Engineeringen_US
thesis.degree.disciplineEngineeringen_US
thesis.degree.grantorRice Universityen_US
thesis.degree.levelDoctoralen_US
thesis.degree.nameDoctor of Philosophyen_US
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