Effect of polymer nonideality in a colloid-polymer mixture

Phys. Rev. E 52, 5205 – Published 1 November 1995
P. B. Warren, S. M. Ilett, and W. C. K. Poon


We preesnt a theory for the effect of polymer nonideality on the phase behavior of a hard-sphere colloid plus nonadsorbing polymer mixture. Starting from the behavior at the θ temperature, which has been treated previously within a mean-field framework [H. N. W. Lekkerkerker et al., Europhys. Lett. 20, 559 (1992)], we use perturbation theory to take into the account the polymer-polymer interaction up to the second virial level. Theoretical predictions of the phase behavior are compared with data obtained in one particular model system: sterically stabilized polymethylmethacrylate particles and random-coil polystyrene dispersed in cis-decahydronapthelene. Within the same theoretical framework the potential of the mean force is calculated between a pair of plates immersed in a nonideal polymer solution. The result, showing a potential barrier in front of an attractive depletion well, is in agreement with a recent calculation by Walz and Sharma [J. Y. Walz and A. Sharma, J. Colloid Interface Sci. 168, 485 (1994)].

DOI: http://dx.doi.org/10.1103/PhysRevE.52.5205

  • Received 15 March 1995
  • Published in the issue dated November 1995

© 1995 The American Physical Society

Authors & Affiliations

P. B. Warren

  • Unilever Research Port Sunlight Laboratory, Quarry Road East, Bebington, Wirral L63 3JW, United Kingdom

S. M. Ilett and W. C. K. Poon

  • Department of Physics and Astronomy, The University of Edinburgh, Mayfield Road, Edinburgh EH9 3JZ, United Kingdom

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