Atomistic Calculations of Fluid-Fluid Interfacial Mobility

Liquid-liquid and liquid-vapor interfacial mobilities are calculated for the first time using equilibrium dual control volume grand canonical molecular dynamics. Mobility is calculated from one-dimensional random walks of the interface using three different methods based on interfacial position variance, interfacial mean squared displacement, and time-autocorrelation of the interfacial velocity. The mobilities calculated with all three methods show excellent agreement for both liquid-liquid and liquid-vapor systems indicating that any one of the calculation methods could be used to calculate the interfacial mobility.