Volume 82, Number 6, June 2008
|Number of page(s)||5|
|Section||Interdisciplinary Physics and Related Areas of Science and Technology|
|Published online||29 May 2008|
Phase diagram for a mixture of colloids and polymers with equal size
Forschungszentrum Jülich, Institut für Festkörperforschung - D-52425 Jülich, Germany
2 SUPA and School of Physics, The University of Edinburgh, Edinburgh - EH9 3JZ, UK
3 Condensed Matter Physics Laboratory, Heinrich-Heine-University - Universitätsstrasse 1, D-40225 Düsseldorf, Germany
4 Department of Chemistry, Physical and Theoretical Chemistry Laboratory, University of Oxford South Parks Road, Oxford OX1 3QZ, UK
5 Van't Hoff Laboratory, Utrecht University - Padualaan 8, 3584 CH Utrecht, The Netherlands
6 Laboratory of Physical Chemistry and Colloid Science, Wageningen University - 6703 HB Wageningen, The Netherlands
Corresponding author: firstname.lastname@example.org
Accepted: 21 April 2008
We present the phase diagram of a colloid-polymer mixture in which the radius a of the colloidal spheres is approximately the same as the radius R of a polymer coil (q = R/a≈ 1). A three-phase coexistence region is experimentally observed, previously only reported for colloid-polymer mixtures with smaller polymer chains (q ≲ 0.6). A recently developed generalized free-volume theory (GFVT) for mixtures of hard spheres and non-adsorbing excluded-volume polymer chains gives a quantitative description of the phase diagram. Monte Carlo simulations also agree well with experiment.
PACS: 82.70.Dd – Colloids / 64.60.-i – General studies of phase transitions / 61.25.H- – Macromolecular and polymers solutions; polymer melts
© EPLA, 2008
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