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Wetting in mixtures of colloids and excluded-volume polymers from density-functional theory
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10.1063/1.2129261
By Paweł Bryk1,a)
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Affiliations:
1 Department for the Modeling of Physico-Chemical Processes, Maria Curie-Skłodowska University, 20-031 Lublin, Poland
a) Electronic mail: pawel@paco.umcs.lublin.pl
J. Chem. Phys. 123, 234907 (2005)
/content/aip/journal/jcp/123/23/10.1063/1.2129261
http://aip.metastore.ingenta.com/content/aip/journal/jcp/123/23/10.1063/1.2129261
View: Figures

## Figures

FIG. 1.

Bulk phase diagram for a colloid polymer mixture with and . The main figure shows the binodal (solid line), the spinodal (dashed line), and the bulk critical point (open circle) evaluated in the polymer segment mole fraction-total density plane. The open circle denotes the bulk critical point. The inset shows the binodals resulting from the TPT1 (solid line) and free volume (dot-dashed line) theories evaluated in the colloid-polymer packing fraction representation.

FIG. 2.

The excess polymer segment adsorption isotherm for a colloid-polymer mixture with and , calculated along path I from Fig. 1 (upper panel) and along path II from Fig. 1 (lower panel). The dotted lines denote bulk coexistence.

FIG. 3.

The excess polymer segment adsorption isotherm for a colloid-polymer mixture with and , calculated along a path of constant polymer segment packing fraction . The dashed line marks the prewetting transition, while the dotted line denotes bulk coexistence. The inset illustrates the nature of the divergence of the excess adsorption (open circles) upon approaching bulk coexistence. increases linearly as a function of the logarithm of the undersaturation . The straight solid line is a guide to the eye.

FIG. 4.

Average polymer segment (a) and colloid (b) density profiles for a colloid-polymer mixture with and near a hard wall. The profiles are evaluated for constant polymer segment packing fraction and for total bulk densities (the dashed and solid lines correspond to the coexisting thin- and thick-film phases of the prewetting transition, respectively), 0.0126 (dotted lines), and 0.012 617 (dot-dashed lines).

FIG. 5.

Surface phase diagram for a colloid polymer mixture with and in the polymer segment mole fraction-total density plane. The binodal and the spinodal are denoted by the solid and dashed lines, respectively. The open circle denotes the bulk critical point. The filled circle denotes the wetting point whereas the triangle denotes the surface critical point. Thick solid line denotes the prewetting line. The inset shows the surface phase diagram in the colloid-polymer packing fraction representation.

FIG. 6.

Surface phase diagram for a colloid polymer mixture with and in the polymer segment mole fraction-total density plane. The binodal and the spinodal are denoted by the solid and dashed lines, respectively. The open circle denotes the bulk critical point. The filled circle denotes the wetting point whereas the triangle denotes the surface critical point. Thick solid line denotes the prewetting line. The inset shows the surface phase diagram in the polymer segment mole fraction-pressure representation.

/content/aip/journal/jcp/123/23/10.1063/1.2129261
2005-12-20
2014-04-18

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