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Kirkwood-Buff Analysis of Liquid Mixtures in an Open Boundary Simulation
Debashish Mukherji1, Nico F A van der Vegt2, Kurt Kremer1
1Max-Planck Institut für Polymerforschung, Ackermannweg 10, 55128 Mainz, Germany.
Abstract:
Using the adaptive resolution (AdResS) molecular dynamics scheme, we present a new approach to calculate the thermodynamic properties of liquid mixtures in an open boundary simulation. As a test case, we simulate methanol-water mixtures. We show that Kirkwood-Buff integrals (KBI), which directly connect global thermodynamic properties to microscopic molecular distributions, can be efficiently calculated over a wide range of methanol mole fractions by choosing only a very small (∼3% of total simulation domain) open boundary explicit (all atom) region and a surrounding coarse-grained reservoir that takes care of correct particle fluctuations.
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