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Effect of excluded volume interactions on the interfacial properties of colloid-polymer mixtures
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10.1063/1.2818562
/content/aip/journal/jcp/128/2/10.1063/1.2818562
http://aip.metastore.ingenta.com/content/aip/journal/jcp/128/2/10.1063/1.2818562

Figures

Image of FIG. 1.
FIG. 1.

(a) Illustration of a mixture of colloids and polymer chains in contact with a hard wall. Depletion zones (dashed lines) and overlap zones (light gray) are also depicted. (b) Illustration of a model colloid-polymer mixture in the polymer-as-soft-sphere approach.

Image of FIG. 2.
FIG. 2.

Interaction potentials for polymer density . (a) Pair potential between polymers (full line) and between polymers and colloids (dashed line). (b) Wall-polymer potential as a function of the distance of the polymer center of mass from the wall.

Image of FIG. 3.
FIG. 3.

Logarithm of the probability (not normalized) as a function of the colloid packing fraction for a simulation box with dimensions of at varying polymer reservoir packing fractions , 1.20, and 1.23, from top to bottom. All state points are at coexistence.

Image of FIG. 4.
FIG. 4.

The chemical potential as a function of the polymer packing fraction in a system of pure polymers. The equation of state (9) (solid line) is compared with the results of grand canonical Monte Carlo simulations (circles) of pure polymers interacting with the interaction potential [Eq. (2)].

Image of FIG. 5.
FIG. 5.

Bulk phase diagram of colloid-polymer mixtures with a size ratio for volumes (circles) and (squares). Also shown are the binodals of the AOV model with size ratio (dashed lines) and the results of Ref. 51 (solid line). (a) Polymer packing fraction , colloid packing fraction representation. Shown also are the results of the free volume theory with polymer interactions (Ref. 42) (dotted-dashed line) and the experimental results of de Hoog and Lekkerkerker (Ref. 12) (diamonds). (b) Polymer reservoir packing fraction , colloid packing fraction representation.

Image of FIG. 6.
FIG. 6.

Dimensionless interfacial tension between the gas and the liquid phase as a function of the difference in packing fractions of the coexisting liquid and gas phases. Results for the interacting polymers with size ratio (circles) are compared with the results for the AOV model with size ratio (square). Triangles denote experimental results of de Hoog and Lekkerkerker (Ref. 12) (triangles up) and Aarts et al. (Ref. 21) (triangles down). The thick continuous line indicates the DFT predictions of Moncho-Jorda et al. (Ref. 47), while the dashed lines are the predictions of the square gradient approximation theory of Aarts et al. (Ref. 45).

Image of FIG. 7.
FIG. 7.

Phase diagram of colloid-polymer mixtures confined between two hard walls with distances . Solid lines are a guide for the eye. (a) Polymer packing fraction , colloid packing fraction representation. Inset: Blowup of the high region of the binodal. (b) Polymer reservoir packing fraction , colloid packing fraction representation.

Image of FIG. 8.
FIG. 8.

Typical configurations from computer simulations of the [(a) and (c)] coexisting gas and [(b) and (d)] liquid phase for the confined system with separation distance and chemical potentials and . Colloids are dark gray and polymers are light gray. For clarity (c) and (d) display the same configurations of (a) and (b), respectively, without the polymers.

Image of FIG. 9.
FIG. 9.

Phase diagram of colloid-polymer mixtures confined between two hard walls with distances in the polymer chemical potential , colloid chemical potential representation. In (b), we show a blowup of the phase diagram. For clarity, the results of are not shown.

Image of FIG. 10.
FIG. 10.

Phase diagram of colloid-polymer mixtures confined between two hard walls in the polymer chemical potential , colloid chemical potential representation. (a) , 4, and 2 for the model discussed in this paper. (b) , 5, and 2 for the AOV model. Results are taken from Ref. 31.

Tables

Generic image for table
Table I.

Coefficients for the density-dependent parameters of the polymer-polymer interaction potential defined in Eq. (2).

Generic image for table
Table II.

Coefficients for the density-dependent parameters of the colloid-polymer interaction potential defined in Eq. (7) for size ratio .

Generic image for table
Table III.

Coefficients for the density-dependent parameters of the wall-polymer interaction potential defined in Eq. (8).

Generic image for table
Table IV.

Critical values of the polymer reservior packing fraction , colloid packing fraction , and chemical potentials and for wall separation distances , 16, 8, 4, and 2.

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/content/aip/journal/jcp/128/2/10.1063/1.2818562
2008-01-11
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Effect of excluded volume interactions on the interfacial properties of colloid-polymer mixtures
http://aip.metastore.ingenta.com/content/aip/journal/jcp/128/2/10.1063/1.2818562
10.1063/1.2818562
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