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Carlson S, Schullian O, Becker MR, Netz RR. Modeling Water Interactions with Graphene and Graphite via Force Fields Consistent with Experimental Contact Angles. J Phys Chem Lett 2024; 15:6325-6333. [PMID: 38856977 PMCID: PMC11194815 DOI: 10.1021/acs.jpclett.4c01143] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2024] [Revised: 05/31/2024] [Accepted: 06/04/2024] [Indexed: 06/11/2024]
Abstract
Accurate simulation models for water interactions with graphene and graphite are important for nanofluidic applications, but existing force fields produce widely varying contact angles. Our extensive review of the experimental literature reveals extreme variation among reported values of graphene-water contact angles and a clustering of graphite-water contact angles into groups of freshly exfoliated (60° ± 13°) and not-freshly exfoliated graphite surfaces. The carbon-oxygen dispersion energy for a classical force field is optimized with respect to this 60° graphite-water contact angle in the infinite-force-cutoff limit, which in turn yields a contact angle for unsupported graphene of 80°, in agreement with the mean of the experimental results. Interaction force fields for finite cutoffs are also derived. A method for calculating contact angles from pressure tensors of planar equilibrium simulations that is ideally suited to graphite and graphene surfaces is introduced. Our methodology is widely applicable to any liquid-surface combination.
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Affiliation(s)
- Shane
R. Carlson
- Fachbereich
Physik, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin, Germany
| | - Otto Schullian
- Fachbereich
Physik, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin, Germany
- Department
of Biomaterials, Max Planck Institute of
Colloids and Interfaces, D-14424 Potsdam, Germany
| | - Maximilian R. Becker
- Fachbereich
Physik, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin, Germany
| | - Roland R. Netz
- Fachbereich
Physik, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin, Germany
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2
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Gill WA, Janjua MRSA. Ab Initio Calculations of the Interaction Potential of the N 2O-N 2O Dimer: Strength of the Intermolecular Interactions and Physical Insights. J Phys Chem A 2023. [PMID: 37478471 DOI: 10.1021/acs.jpca.3c02634] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/23/2023]
Abstract
N2O, or nitrous oxide, is an important greenhouse gas with a significant impact on global warming and climate change. To accurately model the behavior of N2O in the atmosphere, precise representations of its intermolecular force fields are required. First principles quantum mechanical calculations followed by appropriate fitting are commonly used to establish such force fields. However, fitting such force fields is challenging due to the complex mathematical functions that describe the molecular interactions of N2O. As such, ongoing research is focused on improving our understanding of N2O and developing more accurate models for use in climate modeling and other applications. In this study, we investigated the strength of the intermolecular interactions in the N2O-N2O dimer using the coupled-cluster theory with single, double, and perturbative triple excitation [CCSD(T)] method with the def2-QZVPP basis set. Our calculations provided a detailed understanding of the intermolecular forces that govern the stability and structure of the N2O dimer. We found that the N2O-N2O dimer is stabilized by a combination of van der Waals forces and dipole-dipole interactions. The calculated interaction energy between the two N2O molecules in the dimer was found to be -5.09 kcal/mol, which is in good agreement with previous theoretical and experimental results. Additionally, we analyzed the molecular properties of the N2O-N2O dimer, including its geometry and charge distribution. Our calculations provide a comprehensive understanding of the intermolecular interactions in the N2O-N2O dimer using the CCSD(T) method with the def2-QZVPP basis set by using the improved Lennard-Jones interaction potential method. These results can be used to improve our understanding of atmospheric chemistry and climate modeling, as well as to aid in the interpretation of experimental data.
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Affiliation(s)
- Waqas Amber Gill
- Departamento de Química Física, Universidad de Valencia, Avda Dr. Moliner, 50, Burjassot E-46100, Valencia, Spain
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3
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Zhang C, Li X, Wang S, Wang J, Zhu S, Guan S. Does Expanding or Contracting MgO Lattice Really Help with Corrosion Resistance of Mg Surface: Insights from Molecular Dynamics Simulations. ACS OMEGA 2021; 6:1099-1107. [PMID: 33490769 PMCID: PMC7818080 DOI: 10.1021/acsomega.0c03755] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/05/2020] [Accepted: 12/04/2020] [Indexed: 06/12/2023]
Abstract
In a humid environment, water droplets on the solid surface can act as a medium to accelerate corrosion. If the solid material has hydrophobic properties, the surface of the material will remain "clean" and corrosion may be retarded to a certain extent. In theory, MgO itself is a hydrophilic material, and we can apply additional stress or strain to change its lattice constant and adjust the wetting behavior of water on the MgO surface, resulting in changes of corrosion resistance. In order to study the effects of MgO lattice expansion or contraction on the wetting behavior of nano-water, molecular dynamics simulations have been performed in this work. It is found that the changes of the lattice constants on the MgO surface can significantly change the wetting tendency. It will alter the interaction forces between water molecules and MgO surfaces, which in turn changes the atomic density profiles, the orientation of OH bonds, and hydrogen bond networks. The contraction of MgO can actually result in the increase of wetting angles of nano-water droplets on the MgO surface and gradually exhibits hydrophobic properties.
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Affiliation(s)
- Chi Zhang
- School
of Materials Science and Engineering, Beijing
Institute of Technology, Beijing 100081, China
| | - Xin Li
- School
of Materials Science and Engineering, Beijing
Institute of Technology, Beijing 100081, China
| | - Shuo Wang
- School
of Materials Science and Engineering, Beijing
Institute of Technology, Beijing 100081, China
| | - Junsheng Wang
- School
of Materials Science and Engineering, Beijing
Institute of Technology, Beijing 100081, China
- Advanced
Research Institute of Multidisciplinary Science, Beijing Institute of Technology, Beijing 100081, China
| | - Shijie Zhu
- School
of Materials Science and Engineering, Zhengzhou
University, Zhengzhou 450002, China
| | - Shaokang Guan
- School
of Materials Science and Engineering, Zhengzhou
University, Zhengzhou 450002, China
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4
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Joshi SY, Deshmukh SA. A review of advancements in coarse-grained molecular dynamics simulations. MOLECULAR SIMULATION 2020. [DOI: 10.1080/08927022.2020.1828583] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Soumil Y. Joshi
- Department of Chemical Engineering, Virginia Tech, Blacksburg, VA, USA
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5
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Belyaeva LA, Jiang L, Soleimani A, Methorst J, Risselada HJ, Schneider GF. Liquids relax and unify strain in graphene. Nat Commun 2020; 11:898. [PMID: 32060270 PMCID: PMC7021765 DOI: 10.1038/s41467-020-14637-x] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2018] [Accepted: 01/17/2020] [Indexed: 12/05/2022] Open
Abstract
Solid substrates often induce non-uniform strain and doping in graphene monolayer, therefore altering the intrinsic properties of graphene, reducing its charge carrier mobilities and, consequently, the overall electrical performance. Here, we exploit confocal Raman spectroscopy to study graphene directly free-floating on the surface of water, and show that liquid supports relief the preexisting strain, have negligible doping effect and restore the uniformity of the properties throughout the graphene sheet. Such an effect originates from the structural adaptability and flexibility, lesser contamination and weaker intermolecular bonding of liquids compared to solid supports, independently of the chemical nature of the liquid. Moreover, we demonstrate that water provides a platform to study and distinguish chemical defects from substrate-induced defects, in the particular case of hydrogenated graphene. Liquid supports, thus, are advantageous over solid supports for a range of applications, particularly for monitoring changes in the graphene structure upon chemical modification. Here, the authors report water as a superior platform to suspend graphene compared to solid substrates that induce non-uniformity and do not provide structural flexibility. They utilize confocal Raman spectroscopy to study graphene floating freely on the surface of water to show that a liquid support relieves the pre-existing strain.
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Affiliation(s)
- Liubov A Belyaeva
- Faculty of Science, Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, 2333CC, Leiden, The Netherlands
| | - Lin Jiang
- Faculty of Science, Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, 2333CC, Leiden, The Netherlands
| | - Alireza Soleimani
- Institute of Theoretical Physics, Georg-August University Göttingen, Friedrich-Hund-Platz 1, 37077, Göttingen, Germany
| | - Jeroen Methorst
- Faculty of Science, Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, 2333CC, Leiden, The Netherlands
| | - H Jelger Risselada
- Faculty of Science, Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, 2333CC, Leiden, The Netherlands.,Institute of Theoretical Physics, Georg-August University Göttingen, Friedrich-Hund-Platz 1, 37077, Göttingen, Germany
| | - Grégory F Schneider
- Faculty of Science, Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, 2333CC, Leiden, The Netherlands.
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An Y, Singh S, Bejagam KK, Deshmukh SA. Development of an Accurate Coarse-Grained Model of Poly(acrylic acid) in Explicit Solvents. Macromolecules 2019. [DOI: 10.1021/acs.macromol.9b00615] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Yaxin An
- Department of Chemical Engineering, Virginia Tech, Blacksburg, Virginia 24061, United States
| | | | - Karteek K. Bejagam
- Department of Chemical Engineering, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - Sanket A. Deshmukh
- Department of Chemical Engineering, Virginia Tech, Blacksburg, Virginia 24061, United States
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7
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Singh SK, Bejagam KK, An Y, Deshmukh SA. Machine-Learning Based Stacked Ensemble Model for Accurate Analysis of Molecular Dynamics Simulations. J Phys Chem A 2019; 123:5190-5198. [DOI: 10.1021/acs.jpca.9b03420] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
| | - Karteek K. Bejagam
- Department of Chemical Engineering, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - Yaxin An
- Department of Chemical Engineering, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - Sanket A. Deshmukh
- Department of Chemical Engineering, Virginia Tech, Blacksburg, Virginia 24061, United States
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8
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Jiang H, Fialoke S, Vicars Z, Patel AJ. Characterizing surface wetting and interfacial properties using enhanced sampling (SWIPES). SOFT MATTER 2019; 15:860-869. [PMID: 30644500 DOI: 10.1039/c8sm02317d] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
We introduce an accurate and efficient method for characterizing surface wetting and interfacial properties, such as the contact angle made by a liquid droplet on a solid surface, and the vapor-liquid surface tension of a fluid. The method makes use of molecular simulations in conjunction with the indirect umbrella sampling technique to systematically wet the surface and estimate the corresponding free energy. To illustrate the method, we study the wetting of a family of Lennard-Jones surfaces by water. For surfaces with a wide range of attractions for water, we estimate contact angles using our method, and compare them with contact angles obtained using droplet shapes. Notably, our method is able to capture the transition from partial to complete wetting as surface-water attractions are increased. Moreover, the method is straightforward to implement and is computationally efficient, providing accurate contact angle estimates in roughly 5 nanoseconds of simulation time.
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Affiliation(s)
- Hao Jiang
- Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, PA 19104, USA.
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9
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Bejagam KK, An Y, Singh S, Deshmukh SA. Machine-Learning Enabled New Insights into the Coil-to-Globule Transition of Thermosensitive Polymers Using a Coarse-Grained Model. J Phys Chem Lett 2018; 9:6480-6488. [PMID: 30372083 DOI: 10.1021/acs.jpclett.8b02956] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
We present a computational framework that integrates coarse-grained (CG) molecular dynamics (MD) simulations and a data-driven machine-learning (ML) method to gain insights into the conformations of polymers in solutions. We employ this framework to study conformational transition of a model thermosensitive polymer, poly( N-isopropylacrylamide) (PNIPAM). Here, we have developed the first of its kind, a temperature-independent CG model of PNIPAM that can accurately predict its experimental lower critical solution temperature (LCST) while retaining the tacticity in the presence of an explicit water model. The CG model was extensively validated by performing CG MD simulations with different initial conformations, varying the radius of gyration of chain, the chain length, and the angle between the adjacent monomers of the initial configuration of PNIPAM (total simulation time = 90 μs). Moreover, for the first time, we utilize the nonmetric multidimensional scaling (NMDS) method, a data-driven ML approach, to gain further insights into the mechanisms and pathways of this coil-to-globule transition by analyzing CG MD simulation trajectories. NMDS analysis provides entirely new insights and shows multiple metastable states of PNIPAM during its coil-to-globule transition above the LCST.
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Affiliation(s)
- Karteek K Bejagam
- Department of Chemical Engineering , Virginia Tech , Blacksburg , Virginia 24061 , United States
| | - Yaxin An
- Department of Chemical Engineering , Virginia Tech , Blacksburg , Virginia 24061 , United States
| | - Samrendra Singh
- CNH Industrial , Burr Ridge , Illinois 60527 , United States
| | - Sanket A Deshmukh
- Department of Chemical Engineering , Virginia Tech , Blacksburg , Virginia 24061 , United States
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10
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An Y, Bejagam KK, Deshmukh SA. Development of New Transferable Coarse-Grained Models of Hydrocarbons. J Phys Chem B 2018; 122:7143-7153. [DOI: 10.1021/acs.jpcb.8b03822] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yaxin An
- Department of Chemical Engineering, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - Karteek K. Bejagam
- Department of Chemical Engineering, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - Sanket A. Deshmukh
- Department of Chemical Engineering, Virginia Tech, Blacksburg, Virginia 24061, United States
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11
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Bejagam KK, Singh S, An Y, Berry C, Deshmukh SA. PSO-Assisted Development of New Transferable Coarse-Grained Water Models. J Phys Chem B 2018; 122:1958-1971. [DOI: 10.1021/acs.jpcb.7b10542] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Karteek K. Bejagam
- Department
of Chemical Engineering, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - Samrendra Singh
- CNH Industrial, Burr Ridge, Chicago, Illinois 60527, United States
| | - Yaxin An
- Department
of Chemical Engineering, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - Carter Berry
- Department
of Chemical Engineering, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - Sanket A. Deshmukh
- Department
of Chemical Engineering, Virginia Tech, Blacksburg, Virginia 24061, United States
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