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- W850588780 abstract "Azobenzene based photochromics have been studied widely since the development of thefirst azo dye, Mauvine, by Perkin in 1856. Azo based dyes have been widely used in industryfor over a century. The desire to study them arose from their ease of synthesis and the wideavailability of colours which can be tuned by manipulation of the chromophores on the azomolecule itself.The ability of azobenzene to photoisomerise between trans and cis states is widely known.The change in dipole moment affords the ability to fine-tune surfaces via photoisomerisationof the azo molecule. The objective of this investigation was to alter the surface properties ofa variety of substrates via the photoisomerisation reaction of several perfluoroalkyl derivedazobenzene compounds. These compounds are novel and are based on the idea of thefluoroalkyl chain creating a superhydrophobic surface, similar to Teflon, which wouldchange surface energy upon isomerisation of the azobenzene molecule to give a morehydrophilic surface. This would ultimately then be utilised to coat a fabric surface to providea photosensitive coating.The compounds used in this work (Admat 1 and 2 and Cfam derivatives) were synthesised inorder for their photochemistry in solution and on surfaces to be investigated. The studiesbegan with the photoisomerisation investigations in solution and the calculation of the rateconstant and finally the activation energies of these compounds in a variety of commonsolvents. Interesting results were observed in polar protic solvents which were investigatedfurther. The discovery that aggregation occurred in polar protic solvents due to solubilityissues, which in turn led to a fast rate constant was a key finding of the solution work.The surface studies began with the investigation of cellulose as a substrate due to thestructural similarity it has with cotton. The azo compounds were derivatised using cyanuricchloride to afford a triazinyl group which was able to attach to the surface of the cellulose viathe hydroxyl groups on the surface." @default.
- W850588780 created "2016-06-24" @default.
- W850588780 creator A5022944893 @default.
- W850588780 date "2011-01-01" @default.
- W850588780 modified "2023-09-23" @default.
- W850588780 title "Studies of novel perfluoroalkyl derivatives of azobenzene in solution and on surfaces" @default.
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- W850588780 hasPublicationYear "2011" @default.
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