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Flory–Huggins parameter χ=χ0+χ1ϕ as a function of the charge interaction strength Γ=λ∕σ and the gel volume fraction ϕ for simulated polyelectrolyte gels with divalent counterions α=1. The values of χ0 and χ1 shown here give the fitted isotherms for α=1 in Fig. 4.
