Functional and Structural Characterization of Nanoparticulate Transition Metal Complexes Prepared Using Precipitation with Compressed Carbon Dioxide as an Antisolvent

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Issue Date
2008-04-29Author
Johnson, Chad Aaron
Publisher
University of Kansas
Format
145 pages
Type
Dissertation
Degree Level
PH.D.
Discipline
Chemical & Petroleum Engineering
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This item is protected by copyright and unless otherwise specified the copyright of this thesis/dissertation is held by the author.
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Show full item recordAbstract
Nanostructures with novel size-dependent functional properties are rapidly emerging. In this dissertation, molecule-based nanoparticles of Cobalt-salen complexes were prepared from an organic solution of the compound using the precipitation with compressed antisolvent (PCA) technique. In situ X-ray absorption spectroscopy (EXAFS and XANES) in conjunction with quantitative microbalance techniques were employed to gain insight into the relationship between the structure and the gas binding ability of the nanoparticles. Unprocessed Co(salen), the starting material, was found to be of a square planar geometry and displayed no measurable binding for either dioxygen (O2) or nitric oxide (NO). In contrast, the Co(salen) nanoparticles with a distorted tetrahedral geometry showed near-stoichiometric O2 uptake as well as reactivity with NO. The nanoparticles were successfully coated on alumina supports using a Wurster-type coating device. These findings open new avenues for formation and novel applications of nanoparticulate metal complexes.
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- Engineering Dissertations and Theses [1055]
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