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Title: Surface engineering of metal oxides using polynucleating ligands
Author: Cooper, Rachel J.
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 2006
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Chapter 1 provides a general review of functionalised ligands used in surface engineering and considers applications such as corrosion protection, pigment dispersion, adhesion promotion and friction modification. The passivation of aluminium flake used in water-based metallic paints is considered in Chapter 2. Current processes for the pre-treatment of aluminium involve toxic materials and the development of benign alternatives is discussed. Measurements of adsorption isotherms by ICP-OES of a series of mono and diphosphonic acids that bind strongly to aluminium trihydroxide (ATH) are correlated with performance in passivation tests based on hydrogen evolution. Ligands allowing secondary binding interactions through additional functional groups showed higher equilibrium adsorption constants than unfunctionalised analogues but had a negative effect on the passivating ability. The most efficient passivators are those with long hydrophobic chains, e.g. octylphosphonic acid and dodecylphosphonic acid and Al-flake treated with these performed as well as commercially available passivated Al-flake. The design criteria for the formation of ternary (dye/cyclodextrin/surface) complexes for the protection of water soluble azo-dyes that are inkjet printed onto oxide treated papers is discussed in Chapter 3. 4-(4’-Hydroxyphenylazo)phenylarsonic acid, 4-(4’-aminophenylazo)phenylarsonic acid and 4-(4’dimethylaminephenylazo)benzene arsenic acid display evidence for multi-layering when adsorbed on goethite (Chapter 4). In Chapter 5, alternative surface treatments for metal oxides are discussed which use some of the design features assumed to be important in chromating of oxide surfaces, notably the formation of thermodynamically and kinetically stable M(III) oxo or hydroxyl complexes. The possibility of using cobalt(III) amine complexes which have some labile coordination sites was investigated.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available