Nucleus-size pinning for determination of nucleation free-energy barriers and nucleus geometry

The Journal of Chemical Physics
Abhishek K Sharma, Fernando A Escobedo

Abstract

Classical Nucleation Theory (CNT) has recently been used in conjunction with a seeding approach to simulate nucleation phenomena at small-to-moderate supersaturation conditions when large free-energy barriers ensue. In this study, the conventional seeding approach [J. R. Espinosa et al., J. Chem. Phys. 144, 034501 (2016)] is improved by a novel, more robust method to estimate nucleation barriers. Inspired by the interfacial pinning approach [U. R. Pedersen, J. Chem. Phys. 139, 104102 (2013)] used before to determine conditions where two phases coexist, the seed of the incipient phase is pinned to a preselected size to iteratively drive the system toward the conditions where the seed becomes a critical nucleus. The proposed technique is first validated by estimating the critical nucleation conditions for the disorder-to-order transition in hard spheres and then applied to simulate and characterize the highly non-trivial (prolate) morphology of the critical crystal nucleus in hard gyrobifastigia. A generalization of CNT is used to account for nucleus asphericity and predict nucleation free-energy barriers for gyrobifastigia. These predictions of nuclei shape and barriers are validated by independent umbrella sampling calculations.

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Citations

Oct 17, 2019·The Journal of Chemical Physics·P Montero de HijesCarlos Vega
Jan 16, 2021·ACS Nano·Andreas NeophytouDwaipayan Chakrabarti
May 5, 2021·The Journal of Physical Chemistry. B·Abhishek K Sharma, Fernando A Escobedo
Sep 7, 2018·The Journal of Physical Chemistry. B·Abhishek K Sharma, Fernando A Escobedo
Dec 9, 2021·Soft Matter·Yuan ZhouSharon C Glotzer

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