Browsing by Author "Trebilco, Deborah-Anne"

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Infrared study of adsorption on silica from two-component and three-component liquid mixtures
(Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1978, 74 (09-12), 1978) Buckland, Anthony D.; Rochester, Colin H.; Trebilco, Deborah-Anne; Wigfield, Kenneth
An infrared cell of novel design is described and has been used for the measurement of spectra of discs of powdered silica immersed in liquid mixtures of 2,2,4-trimethylpentane + cyclohexanone, 1,4-dimethylbenzene + cyclohexanone and 2,2,4-trimethylpentane + 1,4-dimethylbenzene + cyclohexanone. The proportions of surface silanol groups perturbed by interaction with each component of the liquid mixtures were evaluated from absorbance data taken from the spectra. With certain provisos, infrared spectroscopy provides a valuable method for the study of adsorption behaviour at the interface between solids and multi-component liquid mixtures.
Infrared study of the adsorption of anisoles on silica immersed in heptane
(Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1978, 74 (05), 1978) Rochester, Colin H.; Trebilco, Deborah-Anne
Infrared spectra have been reported of silica immersed in solutions of anisole, six substituted anisoles (4-nitro, 4-chloro, 4-bromo, 4-methyl, 2-fluoro and 2,6-dimethyl), nitrobenzene and 4-nitrotoluene in heptane. Surface silanol groups were perturbed by hydrogen bonding interactions with either methoxy-groups or the benzene nuclei of adsorbed anisole molecules. Electron with drawing substituents in the anisole ring weakened both types of interaction. The proportion of perturbed silanol groups involved in interactions with benzene nuclei decreased with increasing electron withdrawing power of 4-substituents. Surface silanol groups formed hydrogen bonds with the nitro-groups of adsorbed nitrobenzene and 4-nitrotoluene molecules. An adsorptive interaction involving hydrogen-bond acceptance by nitro-group probably also occurred for 4-nitroanisole.
Infrared study of the surface of silica immersed in liquid mixtures of hydrocarbons
(Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1977, 73 (06), 1977) Rochester, Colin H.; Trebilco, Deborah-Anne
A simple infrared cell is described which enables studies to be made of the perturbation of surface hydroxyl groups caused by the immersion of powdered oxides in hydrocarbon solvents. Results are presented for silica in n-heptane + benzene and in n-heptane + toluene mixtures over the complete liquid composition ranges. Absorbance values taken from the spectra give the proportion of surface hydroxyl groups which are perturbed by contact with each component of a liquid mixture. Hence spectroscopic isotherms were deduced for the adsorption of each component onto specific (hydroxyl group) sites in the oxide surface.