Abstract
We introduce simple prescriptions of the Yukawa potential to describethe effect of size polydispersity and macroion shielding effect incharged colloidal systems. The solid-liquid phase boundaries werepresented with the Lindemann criterion based on molecular dynamicssimulations. Compared with the Robbins-Kremer-Grest simulation results,a deviation of melting line is observed at small λ, which meanslarge macroion screening length. This deviation of phase boundary isqualitatively consistent with the simulation result of the nonlinearPoisson-Boltzmann equation with full many-body interactions. It is foundthat this deviation of the solid-liquid phase behaviour is sensitive tothe screening parameter.
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