Gas-liquid critical point of the ultrasoft restricted primitive model from analytic theory
arXiv:1504.06153 · doi:10.5488/CMP.18.24601
Abstract
Gas-liquid criticality in the ultrasoft restricted primitive model (URPM) of polyelectrolytes is studied using the collective variables-based theory. For the model, an effective Hamiltonian is derived and explicit expressions for all the coefficients are found in a one-loop approximation. Based on this Hamiltonian, the phase and critical behaviour is analysed. Our results provide evidence that the nature of the gas-liquid criticality in the URPM is the same as in the restricted primitive model that includes a hard core.
6 pages, 2 figures
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