Phase behaviour of mixtures of colloidal spheres and excluded volume polymer chains

D.G.A.L. (Dirk) Aarts, R. Tuinier, H.N.W. Lekkerkerker (Supervisor)

Research output: Chapter in Book/Report/Conference proceedingChapterAcademic

Abstract

We study the phase behaviour of mixtures of colloidal spheres and polymers
that have an excluded volume interaction dispersed in a (background) solvent
using the concept of free volume theory. The depletion layer thickness is calculated
from the negative adsorption of polymer segments around a sphere. The
correlation length and thermodynamic properties of the excluded volume interacting
polymer chains in solution are taken into account by using results from
the renormalization group theory. For small polymer-colloid size ratios the difference
with an ideal description of the polymers is small, while for larger size
ratios the gas-liquid coexistence region shifts in the direction of higher polymer
concentrations and at the same time the liquid-crystal coexistence region
becomes more extended. Both the gas-liquid region and the gas-liquid-crystal
region become less extended. These features are compared to experiment.
Original languageEnglish
Title of host publicationPhase behaviour of mixtures of colloidal spheres and excluded volume polymer chains
Pages19-30
Number of pages15
Publication statusPublished - 2002
Externally publishedYes

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