Browsing by Author "House, William A."

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Calculation of the Interaction of Adsorption of Inert Gases on to the (100) Face of Sodium Chloride and Argon on to the (100) Face of Potassium Chloride
(Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1974, 70 (09), 1974) House, William A.; Jaycock, Michael J.
Calculations are presented for the adsorptive potential energy for inert gases on the (100) faces of NaCl and KCl. These are performed using the “exponential-six” equation to calculate dispersion and repulsion terms, and a Fourier expansion method to calculate the electrostatic field interaction. The results are presented as adsorption potential contour maps for the inert gases on NaCl and for Ar on KCl. The isosteric heat at zero coverage is calculated in each case using both mobile and localised adsorption models, and compared with the value predicted using the hindered translation model of Hill.
Determination of the Surface Heterogeneity of Solid Particulates using the Patchwise Adsorption Model
(Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1977, 73 (06), 1977) House, William A.; Jaycock, Michael J.
Two methods of solution of the integral equation describing the physical adsorption of gases on polysorptic surfaces have recently been developed. The derived algorithms, HILDA and CAEDMON, are compared in detail by applying them to the analysis of krypton adsorbed on silver iodide and nitrogen adsorbed on Spheron-6 (untreated and partially annealed), all measured near 77 K. The numerical results are presented in the form of adsorptive energy distributions. The differences between the results from the two programs, most evident in the case of nitrogen adsorbed on Spheron-6, are explained in terms of the convergence and accuracy of the two methods. The program HILDA is found to yield more detail about the heterogeneity distributions than CAEDMON and subsequently more information about the effects of annealing the Spheron-6 surface.
Fourier inversion of light scattering intensity data from coagulating dispersions
(Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1978, 74 (05), 1978) House, William A.
The short range structure of aggregates, which are formed during the coagulation of monodisperse sols, is investigated by developing a rigorous approach to the analysis of light scattering data. The particle distribution function is determined by the Fourier transformation of scattered light intensity data measured over scattering angles in the range 28 to 150°. The direct inversion of the intensity data produces large oscillations in the particle distribution function owing to the truncation of the data set as characterised by the “cut-off” parameter β(∝ particle size and incident light wavelength). These oscillations are removed by including an exponential modification function in the kernel of the transform. The effect of both the “cut-off” function and the “damping” function are assessed by adopting a general analysis and then testing the transformation method on intensity data generated using the Smoluchowski–Benoit model to simulate light scattering from a coagulating system. The results of an experimental investigation of the coagulation of a 0.234 µm diameter polystyrene sol indicates the formation of close-packed aggregates with the average number of neighbours increasing only slightly faster than expected from the von Smoluchowski model of coagulation. The average number of nearest neighbours is considerably less than expected from the Smoluchowski–Benoit model assuming the particles to be hexagonally close-packed.