| Summary: | This project deals with the design, synthesis and evaluation of ink jet dyes to bind to inorganic oxide surfaces particularly that of aluminium oxide. Alumina is applied as a coating on ink jet paper for use in the high added value markets. Chapter 1 provides an overview on the ink jet printing industry but focusing mainly on printing on paper, ink development, papers required for printing, dyes, and absorption isotherms. ‘Simple’ azo dyes are considered in Chapter 2, and binding of these dyes to aluminium trihydroxide [A1(OH)<sub>3</sub>] is examined. Synthetic routes to novel phosphonic acid azo dyes were developed. Iostherm studies demonstrated that phosphonic acid dyes bind much more strongly to A1(OH)<sub>3</sub> when compared against sulfonic, carboxylic, boronic, arsenic and phosphinic acid analogues. Dyes with different acidic functional groups were applied to different papers via ink jet method, and the prints were analysed for their light, ozone and humidity fastness properties. It was found that on changing the functional group of the dye, the humidity fastness was greatly affected. Other ink jet properties such as ozone and light fastness were more dependent on factors such paper type, and the percentage of inorganic oxide coated on the paper. In chapter 3, more complex phosphonic acid azo dyes were designed and synthesised to analyse both binding properties and ink jet properties. In chapter 4, absorption isotherms are reported on dyes in the presence of cyclodextrin to examine the effect of cyclodextrin on binding strength and surface coverage of the dyes. ROESY NMR studies were undertaken to provide conclusive evidence of the inclusion complex, dye-cyclodextrin and UV/vis and NMR studies were performed to determine the strength of these complexes.
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