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Assessing the transferability of common top-down and bottom-up coarse-grained molecular models for molecular mixtures.

Potter, Thomas D. and Tasche, Jos and Wilson, Mark R. (2019) 'Assessing the transferability of common top-down and bottom-up coarse-grained molecular models for molecular mixtures.', Physical chemistry chemical physics., 21 (4). 1912-1927 .

Abstract

The performance of three methods for developing new coarse-grained models for molecular simulation is critically assessed. Two bottom-up approaches are employed: iterative Boltzmann inversion (IBI) and the multiscale coarse-graining method (MS-CG), using an atomistic n-octane-benzene reference system. Results are compared to a top-down coarse-graining approach employing the SAFT-γ Mie equation of state. The performance of each methodology is assessed against the twin criteria of local structure prediction and accurate free energy representation. In addition, the transferability of the generated potentials is compared across state points. We examine the extent to which the IBI methodology can be improved by using a multi-reference approach (MS-IBI), and demonstrate how a pressure correction can be employed to improve the results for the MS-CG approach. Additionally, we look at the effect of including angle-terms in the SAFT model. Finally, we discuss in detail the strengths and weaknesses of each method and suggest possible ways forward for coarse-graining, which may eventually address the problems of structure prediction, thermodynamic consistency and improved transferability within a single model.

Item Type:Article
Full text:(AM) Accepted Manuscript
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1039/C8CP05889J
Date accepted:21 December 2018
Date deposited:02 January 2019
Date of first online publication:27 December 2018
Date first made open access:21 December 2019

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