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Title: Obtaining the solid-liquid interfacial free energy via multi-scheme thermodynamic integration: Ag-ethylene glycol interfaces

Journal Article · · Journal of Chemical Physics
DOI:https://doi.org/10.1063/1.4967521· OSTI ID:1465671
 [1];  [1];  [2]
  1. Pennsylvania State Univ., University Park, PA (United States). Dept. of Chemical Engineering
  2. Pennsylvania State Univ., University Park, PA (United States). Dept. of Chemical Engineering. Dept. of Physics

The solid-liquid interfacial free energy γsl is an important quantity in wetting, nucleation, and crystal growth. Although various methods have been developed to calculate γsl with atomic-scale simulations, such calculations still remain challenging for multi-component interfaces between molecular fluids and solids. In this paper, we present a multi-scheme thermodynamic integration method that is inspired by the “cleaving-wall” method and aimed at obtaining γsl for such systems using open-source simulation packages. This method advances two aspects of its predecessor methods. First, we incorporate separate schemes to resolve difficulties when manipulating periodic boundary conditions of the supercell using open-source simulation packages. Second, we introduce a numerical approximation to obtain thermodynamic integrands for complex force fields when an analytical differentiation is not readily available. To demonstrate this method, we obtain γsl for interfaces between Ag(100) and Ag(111) and ethylene glycol (EG). These interfacial free energies mirror interfacial potential energies for each facet. We also estimate entropies of interface formation and these are consistent with theoretical predictions in signs and trends. For the Ag-EG systems, we find that the largest contribution to γsl is the free energy to create the bare metal surfaces. The second-largest contribution to γsl is from the liquid-solid interaction. Finally, this user-friendly method will accelerate investigation in a broad range of research topics, such as the thermodynamic effect of structure-directing agents in solution-phase shape-controlled nanocrystal syntheses.

Research Organization:
Pennsylvania State Univ., University Park, PA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
Grant/Contract Number:
FG02-07ER46414; OCI-1053575
OSTI ID:
1465671
Alternate ID(s):
OSTI ID: 1333016
Journal Information:
Journal of Chemical Physics, Vol. 145, Issue 19; ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 24 works
Citation information provided by
Web of Science

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Cited By (4)

Theory of the thermodynamic influence of solution-phase additives in shape-controlled nanocrystal synthesis journal January 2017
Characterizing surface wetting and interfacial properties using enhanced sampling (SWIPES) journal January 2019
Efficient scheme for calculating work of adhesion between a liquid and polymer-grafted substrate journal August 2018
Characterizing Surface Wetting and Interfacial Properties using Enhanced Sampling (SWIPES) preprint January 2018