Properties of functionalised porous zirconium titanium oxide materials prepared by supramolecular templating
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(Published version)
Date
2010
Authors
De los Reyes, Massey
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thesis
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Abstract
Palmitic acid comprised of long chain carboxylates was used as a supramolecular template for the preparation of porous zirconium titanium (ZrTi-x) oxide xerogels. Physical characterisation of these materials with differing Zr:Ti metal ratios confirm that their features encompass amorphous wormhole-like structures, narrow monomodal pore size distributions and high surface areas after sol-gel ageing and calcination at 450 °C. Above this calcination temperature, materials present differences in textural morphology and physical attributes displaying newly developed amorphous-to-crystalline phases as evidenced by spectroscopy.
Both poly(acrylonitrile) and Pluronic F127 block copolymers were used as structure directing agents to obtain hierarchically porous zirconium titanium oxide beads using a one-pot/co-condensation process. These beads were synthesised through the addition of a template-metal alkoxide precursor solution using a drop-wise generator into deionised water. Surface modifications performed using sequential zirconium propoxide coatings through a layer-by-layer in-pore self assembly process were found to possess additional surface hydroxyl groups. Further functionalisation of these materials using polyphosphonate molecules were also found to be more abundant on these surfaces compared to surfaces of porous xerogels. The ion-exchange behaviour between competing radiotracers 153Gd and 241Am was also investigated.
School/Discipline
School of Advanced Manufacturing and Mechanical Engineering
Dissertation Note
Thesis (PhD)--University of South Australia, 2010.
Provenance
Copyright 2010 Massey de los Reyes. This work is made available under the Creative Commons Attribution-NonCommercial-NoDerivs Australia 3.0 licence (http://creativecommons.org/licenses/by-nc-nd/3.0/au/)
Description
xvi, 256 leaves
ill. (some col.)
Includes bibliographical references.
ill. (some col.)
Includes bibliographical references.
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506 0#$fstar $2Unrestricted online access