Swelling curves for simulated PE gels of different chain lengths (◻, ◼: 50-mer; ○, ●: 100-mer; △, ▲: 200-mer; and ▽, ▼: 300-mer) in equilibrium with a 1:1 (open symbols) or a 2:1 (solid symbols) electrolyte solution reservoir.
Simulated 300-mer PE gels in equilibrium with 2:1 electrolyte reservoirs. Left: swollen state, ; upper right: partially swollen state, ; lower right: collapsed state, . Blue: monomers; red: divalent counterions; and green: monovalent coions. All three subfigures are rendered at the same scale.
Radial distribution functions in partially collapsed gel with 2:1 electrolyte, , and . Solid red: monomer-counterion; dotted green: monomer-coion; and dashed blue: monomer-monomer.
Two-dimensional cross-sectional color map of electrostatic potential inside 300-mer gels with 2:1 electrolyte. Left: swollen state, ; upper right: partially swollen state, ; and lower right: collapsed state, (these three states correspond to those in Fig. 2). The electrostatic potential is positive in red regions and negative in blue regions. Monomers and ions within of the plane are also shown (blue: monomers; red: divalent counterions; and green: monovalent coions).
Equilibrium concentrations of excess 1:1 (open symbols) and 2:1 (solid symbols) electrolytes in simulated PE gels of different chain lengths (○, ●: 100-mer; △, ▲: 200-mer; and ▽, ▼: 300-mer) as functions of the surrounding electrolyte reservoir concentration.
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