FARADAY DISCUSSIONS OF THE CHEMICAL SOCIETY NO. 76 1983 Concentrated Colloidal Dispersions THE FARADAY DIVISION THE ROYAL SOCIETY OF CHEMISTRY LONDONFARADAY DISCUSSIONS OF THE CHEMICAL SOCIETY NO. 76 1983 Concentrated Colloidal Dispersions THE FARADAY DIVISION THE ROYAL SOCIETY OF CHEMISTRY LONDONA GENERAL DISCUSSION ON Concentrated Colloidal Dispersions 14th, 15th and 16th September, 1983 A GENERAL DISCUSSION on Concentrated Colloidal Dispersions was held at Lough- borough University of Technology on 14th, 15th and 16th September, 1983. The President of the Faraday Division, Professor P. Gray, FRS, was in the chair: about 200 fellows of the Faraday Division and visitors from overseas attended the meeting. Among the overseas visitors were: Prof. B. J. Ackerson, U.S.A.Mr. H. Aijala, Finland Mr. J. L. Arauz-Lara, Mexico Mr. C. W. J. Beenakker, The Netherlands Prof. B. H . Bijsterbosch, The Netherlands Dr. K . Bridger, U.S.A. Dr. W. Brown, Sweden Dr. L. Canova, Italy Dr. D. Y . C. Chan, Australia Dr. J. Chappuis, France Dr. M. Corti, Italy Dr. M. D. Croucher, Canada Dr. N. C. Degaeger, Belgium Prof. V. Degiorgio, Italy Dr. C. G. De Kruif, The Netherlands Dr. A. Diez, West Germany Prof. H-F. Eicke, Switzerland Dr. J. Eisenlauer, West Germany Dr. D. Fairhurst, U S A . Prof. B. U. Felderhof, West Germany Dr. R. Finsy, Belgium Dr. M. Forster, Switzerland Dr. A. P. Gast, U.S.A. Dr. G. E. Gerhardt, U.S.A. Dr. L. Gillberg, Sweden Mr. P. J . Goetz, U.S.A. Mr. J. W. S. Goossens, West Germany Mr. J. Green, U.S.A. Mr. P. Guering, Sweden Dr.J. Hayter, France Dr. M. M. Henriet, Belgium Dr. C. G. Hermansky, U.S.A. Dr. R. E. Highsmith, U.S.A. Prof. H. Hoffmann, West Germany Mr. J . W. Jansen, The Netherlanh Mr. H . Kamphuis, The Netherlands Dr. K. P. Kehrer, U.S.A. Prof. R. Klein, West Germany Dr. R. Kubik, Switzerland Dr. D. Langevin, France Dr. B. Larsson, Sweden Dr. B. 0. Larsson, Sweden Dr. H. M. Laun, West Germany Dr. J. Lebell, Finland Prof. H. N . W. Lekkerkerker, Belgium Dr. J. J. Leucker, Switzerland Dr. G. Ley, West Germany Dr. J . W. Th. Lichtenbelt, The Netherlands Prof. B. Lindman, Sweden Dr. H. Ljusberg-Wahren, Sweden Prof. M. Medina-Noyola, Mexico Dr. M. Miquel, France Dr. J. Moonen, The Netherlands Dr. E. Moreels, Belgium Mr. P-G. Nilsson, Sweden Dr. L. Odberg, Sweden Dr. A.Parentich, Australia Dr. G. Parsiegla, The Netherlands Dr. W. Prange, West Germany Dr. H. M. Princen, U S A . Mr. B. Pugh, Sweden Dr. P. N. Pusey, U.S.A. Prof. W. B. Russel, U.S.A. Dr. P. C. Scholten, The Netherlands Dr. J. Sjoblom, Sweden Dr. I. Snook, Australia Prof. H. N. Stein, The Netherlands Dr. J . Tabony, France Dr. W. van Megen, Australia Dr. J. Van Nieuwkoop, The Netherlands Prof. V. L. Vilker, U.S.A. Prof. A. Vrij, The Netherlands Mr. H . Walderhaug, Sweden Mr. T. Warnheim, Sweden Dr. R. G. Willis, U.S.A. Dr. T. Wolff, West Germany Dr. D. T . Wu, U.S.A. Dr. H. Zecha, East Germany Dr. M. R. Zulauf, FranceOrganising Comm it tee Professor R. H. Ottewill (Chairman) Dr. E. Dickinson Mrs. Y. A. Fish Dr. J. W. Goodwin Dr. M. J. Jaycock Dr. Th. F. Tadros Dr.P. N. Pusey Dr. A. L. Smith Dr. D. A. Young ISBN: 0-85186-648-4 ISSN: 030 1-7249 Printed in Great Britain by Fletcher & Son Ltd., NorwichCONTENTS Page 7 19 37 53 65 77 93 123 137 151 165 179 189 203 219 Concentrated Colloidal Dispersions Viewed as One-component Macrofluids by J . B. Hayter Light Scattering of Colloidal Dispersions in Non-polar Solvents at Finite Concentrations. Silica Spheres as Model Particles for Hard-sphere Interactions by A. Vrij, J. W. Jansen, J. K. G. Dhont, C. Pathamamanoharan, M. M. Kops-Werkhoven and H. M. Fijnaut Properties of Concentrated Polystyrene Latex Dispersions by D. J . Cebula, J. W. Goodwin, G. C. Jeffrey, R. H. Ottewill, A. Paren- tich and R. A. Richardson Neutron-scattering Studies of Concentrated Oxide Sols by J.D. F. Ramsay, R. G. Avery and L. Benest Electrical Double-layer Interactions in Concentrated Colloidal Systems by B. Beresford-Smith and D. Y. C. Chan Light Scattering and Neutron Scattering from Concentrated Dispersions of Small Unilamellar Vesicles by A. G. Muddle, J. S. Higgins, P. G. Cummins, E. J. Staples and I. G. Lyle GENERAL DISCUSSION Hydrodynamic Interactions and Diffusion in Concentrated Particle Suspensions by P. N . Pusey and R. J. A. Tough Mass-diffusion and Self-diffusion Properties in Systems of Strongly Charged Spherical Particles by R. Klein and W. Hess Diffusion in Concentrated Monodisperse Colloidal Solutions. The Hard Sphere- Thermodynamic or Hydrodynamic? by W. van Megen and I. Snook Simulation of Particle Motion and Stability in Concentrated Dispersions by J.Bacon, E. Dickinson and R. Parker Diffusion in Hard-sphere Suspensions by B. U . Felderhof and R. B. Jones Phase Separations Induced in Aqueous Colloidal Suspensions by Dissolved Polymer by A. P. Gast, C. K. Hall and W. B. Russel Rheological Investigations of the Effect of Addition of Free Polymer to Concentrated Sterically Stabilised Polystyrene Latex Dispersions by D. Heath and Th. F. Tadros Cross-correlation Intensity Fluctuation Spectroscopy Applied to Colloidal Suspensions by B. J . Ackerson and N. A. ClarkGENERAL DISCUSSION 229 26 1 277 29 1 305 317 331 353 363 375 381 383 Temperature Dependence of the Sheer Viscosity of Sterically Stabilised Polymer Colloids by M. D. Croucher and T. H. Milkie Sedimentation and Viscous Flow of a Weakly Flocculated Concentrated Dispersion. A Comparative Study by R. Buscall and I. J. McGowan Percolation and Critical Points in Microemulsions by A-M. Cazabat, D. Chatenay, D. Langevin and J. Meunier Concentrated Dispersions of Aqueous Polyelectrolyte-like Microphases in Non-polar Hydrocarbons by H . F . Eicke and R. Kubik Fourier Transform Carbon-13 Relaxation and Self-diffusion Studies of Microemulsions by B. Lindman, T. Ahlnas, 0. Soderman, H. Walderhaug, K. Rapacki and P. Stilbs GENERAL DISCUSSION Electric Birefringence Studies on Concentrated Aqueous Polyoxyethylene Surfac tan t Sy s terns by P. G. Neeson, B. R. Jennings and G. J. T. Tiddy Viscoelas t ic Detergent Soh t ions by H . Rehage and H. Hoffmann GENERAL DISCUSSION LIST OF POSTERS INDEX OF NAMES