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Title: Contact angles from Young’s equation in molecular dynamics simulations

Journal Article · · Journal of Chemical Physics
DOI:https://doi.org/10.1063/1.4994088· OSTI ID:1474037
ORCiD logo [1];  [2]; ORCiD logo [1]
  1. Princeton Univ., NJ (United States). Dept. of Chemical and Biological Engineering
  2. Princeton Univ., NJ (United States). Dept. of Chemical and Biological Engineering; Technical Univ. of Darmstadt (Germany). Eduard Zintl Inst. of Inorganic and Physical Chemistry

In this work, we propose a method to calculate the equilibrium contact angle of heterogeneous 3-phase solid/fluid/fluid systems using molecular dynamics simulations. The proposed method, which combines the phantom-wall method [F. Leroy and F. Müller-Plathe, J. Chem. Phys. 133, 044110 (2010)] and Bennett’s acceptance ratio approach [C. H. Bennett, J. Comput. Phys. 22, 245 (1976)], is able to calculate the solid/fluid surface tension relative to the solid surface energy. The calculated relative surface tensions can then be used in Young’s equation to estimate the equilibrium contact angle. A fluid droplet is not needed for the proposed method, in contrast to the situation for direct simulations of contact angles. In addition, while prior free-energy based methods for contact angles mainly focused on the wetting of fluids in coexistence with their vapor on solid surfaces, the proposed approach was designed to study the contact angles of fluid mixtures on solid surfaces above the fluid saturation pressures. Using the proposed approach, the contact angles of binary Lennard-Jones fluid mixtures on a non-polar solid substrate were calculated at various interaction parameters and the contact angle of water in equilibrium with CO2 on a hydrophilic polar silica surface was obtained. For both non-polar and polar systems, the calculated contact angles from the proposed method were in agreement with those obtained from the geometry of a cylindrical droplet. The computational cost of the proposed method was found to be comparable to that of simulations that use fluid droplets, but the new method provides a way to calculate the contact angle directly from Young’s equation without ambiguity.

Research Organization:
Princeton Univ., NJ (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Oceanic and Atmospheric Administration (NOAA), Boulder, CO (United States); German Research Foundation (DFG)
Grant/Contract Number:
SC0002128; AWD 1004131
OSTI ID:
1474037
Alternate ID(s):
OSTI ID: 1377981
Journal Information:
Journal of Chemical Physics, Vol. 147, Issue 8; ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 40 works
Citation information provided by
Web of Science

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Cited By (7)

Characterizing surface wetting and interfacial properties using enhanced sampling (SWIPES) journal January 2019
Calculation of a solid/liquid surface tension: A methodological study journal January 2018
Calculation of the interfacial tension of the graphene-water interaction by molecular simulations journal January 2019
Interpretation of Young’s equation for a liquid droplet on a flat and smooth solid surface: Mechanical and thermodynamic routes with a simple Lennard-Jones liquid journal January 2019
Extraction of the equilibrium pinning force on a contact line exerted from a wettability boundary of a solid surface through the connection between mechanical and thermodynamic routes journal October 2019
Do the contact angle and line tension of surface-attached droplets depend on the radius of curvature? journal June 2018
Characterizing Surface Wetting and Interfacial Properties using Enhanced Sampling (SWIPES) preprint January 2018