Atomistic Modeling and Simulation of Long-Term Transport Phenomena in Nanomaterials
In the past two decades, extensive research has been conducted towards developing nanomaterials with superior transport properties, such as heat conductivity and mass diffusivity, for applications in various industries including, but not limited to, energy storage and microelectronics. In terms of modeling and simulation, a long-standing difficulty lies in the separation of temporal and spatial scales. Indeed, many transport phenomena in nanomaterials are characterized by slow kinetic processes with time scale of the order of seconds, hours, or even years, far beyond the time windows of existing simulation technologies such as molecular dynamics (MD) and Monte Carlo (MC) methods. We have developed a novel deformation-diffusion coupled computational framework that allows long-term simulation of such slow processes, while at the same time maintains a strictly atomistic description of the material. Our non-equilibrium statistical thermodynamics model includes discrete kinetic laws, which govern mass diffusion and heat conduction at atomic scale. In this work, we explore the capabilities and performance of this computational framework through its application to heat conduction problems.
© 2015 The authors. C.S.M. and M.P.A. gratefully acknowledge the support of the Ministerio de Economía y Competitividad of Spain (DPI2012-32508). M.O. gratefully acknowledges support from the U. S. Army Research Laboratory (ARL) through the Materials in Extreme Dynamic Environments (MEDE) Collaborative Research Alliance (CRA) under Award Number W911NF-11-R-0001. C.S.M. also acknowledges fellowship support from Ministerio de Economía y Competitividad of Spain (BES-2013-066591).
Published - Complas2015_238-247_ATOMISTIC_MODELING.pdf