1
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Zittlau P, Mross S, Gond D, Kohns M. Molecular modeling and simulation of organic electrolyte solutions for lithium ion batteries. J Chem Phys 2024; 161:124118. [PMID: 39344884 DOI: 10.1063/5.0228158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2024] [Accepted: 09/05/2024] [Indexed: 10/01/2024] Open
Abstract
Multi-criteria optimization is used for developing molecular models for ethylene carbonate (EC) and propylene carbonate (PC), organic solvents commonly used in Li-ion batteries. The molecular geometry and partial charges of the solvents are obtained from quantum mechanical calculations. Using a novel optimization strategy that combines systematic variations of the Lennard-Jones parameters with a reduced units approach, the models are fitted to experimental data on the liquid density, vapor pressure, relative permittivity, and self-diffusion coefficient. Since no experimental data for the self-diffusion coefficient of pure EC were available in the literature, they are measured in this work using a gradient-based nuclear magnetic resonance technique. For all pure component properties, excellent agreement between experiment and simulation is obtained. Moreover, the predictive capabilities of the new solvent models are assessed by comparison to experimental data for the liquid density and relative permittivity of mixtures of EC and PC. In addition, molecular models for the anions PF6-, BF4-, and ClO4- in solutions of their lithium electrolytes in PC are developed using experimental data on the solution densities. Finally, the self-diffusion coefficients of LiPF6 in PC and in aqueous solution are predicted and compared, showing that diffusion is much slower in the organic solution due to the formation of larger solvent shells around the ions. Furthermore, an analysis of the radial distribution functions in these solutions suggests that the ions have much less impact on the structure of the solvent PC than on water.
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Affiliation(s)
- Pascal Zittlau
- Laboratory of Engineering Thermodynamics, RPTU Kaiserslautern, Erwin-Schroedinger-Str. 44, D-67663 Kaiserslautern, Germany
| | - Sarah Mross
- Laboratory of Engineering Thermodynamics, RPTU Kaiserslautern, Erwin-Schroedinger-Str. 44, D-67663 Kaiserslautern, Germany
| | - Dominik Gond
- Laboratory of Engineering Thermodynamics, RPTU Kaiserslautern, Erwin-Schroedinger-Str. 44, D-67663 Kaiserslautern, Germany
| | - Maximilian Kohns
- Laboratory of Engineering Thermodynamics, RPTU Kaiserslautern, Erwin-Schroedinger-Str. 44, D-67663 Kaiserslautern, Germany
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2
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Kulkarni A, Bortz M, Küfer KH, Kohns M, Hasse H. Hierarchical Multicriteria Optimization of Molecular Models of Water. J Chem Inf Model 2024; 64:5077-5089. [PMID: 38888988 DOI: 10.1021/acs.jcim.4c00404] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/20/2024]
Abstract
Many widely used molecular models of water are built from a single Lennard-Jones site on which three point charges are positioned, one negative and two positive ones. Models from that class, denoted LJ3PC here, are computationally efficient, but it is well known that they cannot represent all relevant properties of water simultaneously with good accuracy. Despite the importance of the LJ3PC water model class, its inherent limitations in simultaneously describing different properties of water have never been studied systematically. This task can only be solved by multicriteria optimization (MCO). However, due to its computational cost, applying MCO to molecular models is a formidable task. We have recently introduced the reduced units method (RUM) to cope with this problem. In the present work, we apply the RUM in a hierarchical scheme to optimize LJ3PC water models taking into account five objectives: the representation of vapor pressure, saturated liquid density, self-diffusion coefficient, shear viscosity, and relative permittivity. Of the six parameters of the LJ3PC models, five were varied; only the H-O-H bond angle, which is usually chosen based on physical arguments, was kept constant. Our hierarchical RUM-based approach yields a Pareto set that contains attractive new water models. Furthermore, the results give an idea of what can be achieved by molecular modeling of water with models from the LJ3PC class.
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Affiliation(s)
- Aditya Kulkarni
- Laboratory of Engineering Thermodynamics (LTD), RPTU Kaiserslautern, 67663 Kaiserslautern, Germany
| | - Michael Bortz
- Fraunhofer Institute for Industrial Mathematics (ITWM), 67663 Kaiserslautern, Germany
| | - Karl-Heinz Küfer
- Fraunhofer Institute for Industrial Mathematics (ITWM), 67663 Kaiserslautern, Germany
| | - Maximilian Kohns
- Laboratory of Engineering Thermodynamics (LTD), RPTU Kaiserslautern, 67663 Kaiserslautern, Germany
| | - Hans Hasse
- Laboratory of Engineering Thermodynamics (LTD), RPTU Kaiserslautern, 67663 Kaiserslautern, Germany
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3
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Saric D, Bell IH, Guevara-Carrion G, Vrabec J. Influence of repulsion on entropy scaling and density scaling of monatomic fluids. J Chem Phys 2024; 160:104503. [PMID: 38456532 DOI: 10.1063/5.0196592] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2024] [Accepted: 02/18/2024] [Indexed: 03/09/2024] Open
Abstract
Entropy scaling is applied to the shear viscosity, self-diffusion coefficient, and thermal conductivity of simple monatomic fluids. An extensive molecular dynamics simulation series is performed to obtain these transport properties and the residual entropy of three potential model classes with variable repulsive exponents: n, 6 Mie (n = 9, 12, 15, and 18), Buckingham's exponential-six (α = 12, 14, 18, and 30), and Tang-Toennies (αT = 4.051, 4.275, and 4.600). A wide range of liquid and supercritical gas- and liquid-like states is covered with a total of 1120 state points. Comparisons to equations of state, literature data, and transport property correlations are made. Although the absolute transport property values within a given potential model class may strongly depend on the repulsive exponent, it is found that the repulsive steepness plays a negligible role when entropy scaling is applied. Hence, the plus-scaled transport properties of n, 6 Mie, exponential-six, and Tang-Toennies fluids lie basically on one master curve, which closely corresponds with entropy scaling correlations for the Lennard-Jones fluid. This trend is confirmed by literature data of n, 6 Mie, and exponential-six fluids. Furthermore, entropy scaling holds for state points where the Pearson correlation coefficient R is well below 0.9. The condition R > 0.9 for strongly correlating liquids is thus not necessary for the successful application of entropy scaling, pointing out that isomorph theory may be a part of a more general framework that is behind the success of entropy scaling. Density scaling reveals a strong influence of the repulsive exponent on this particular approach.
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Affiliation(s)
- Denis Saric
- Thermodynamics, Technical University of Berlin, Ernst-Reuter-Platz 1, 10587 Berlin, Germany
| | - Ian H Bell
- Applied Chemicals and Materials Division, National Institute of Standards and Technology, Boulder, Colorado 80305, USA
| | | | - Jadran Vrabec
- Thermodynamics, Technical University of Berlin, Ernst-Reuter-Platz 1, 10587 Berlin, Germany
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4
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Frömbgen T, Drysch K, Zaby P, Dölz J, Ingenmey J, Kirchner B. Quantum Cluster Equilibrium Theory for Multicomponent Liquids. J Chem Theory Comput 2024; 20:1838-1846. [PMID: 38372002 DOI: 10.1021/acs.jctc.3c00799] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/20/2024]
Abstract
In this work, we present a new theory to treat multicomponent liquids based on quantum-chemically calculated clusters. The starting point is the binary quantum cluster equilibrium theory, which is able to treat binary systems. The theory provides one equation with two unknowns. In order to obtain another linearly independent equation, the conservation of mass is used. However, increasing the number of components leads to more unknowns, and this requires linearly independent equations. We address this challenge by introducing a generalization of the conservation of arbitrary quantities accompanied by a comprehensive mathematical proof. Furthermore, a case study for the application of the new theory to ternary mixtures of chloroform, methanol, and water is presented. Calculated enthalpies of vaporization for the whole composition range are given, and the populations or weights of the different clusters are visualized.
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Affiliation(s)
- Tom Frömbgen
- Mulliken Center for Theoretical Chemistry, University of Bonn, Beringstraße 4 + 6, Bonn D-53115, Germany
- Max-Planck-Institut Für Chemische Energiekonversion, Stiftstrasse 34-36, Mülheim an der Ruhr D-45470, Germany
| | - Katrin Drysch
- Mulliken Center for Theoretical Chemistry, University of Bonn, Beringstraße 4 + 6, Bonn D-53115, Germany
| | - Paul Zaby
- Mulliken Center for Theoretical Chemistry, University of Bonn, Beringstraße 4 + 6, Bonn D-53115, Germany
| | - Jürgen Dölz
- Institute for Numerical Simulation, University of Bonn, Friedrich-Hirzebruch-Allee 7, Bonn D-53115, Germany
| | - Johannes Ingenmey
- CNRS, Physico-Chimie des Électrolytes et Nanosystèmes Interfaciaux, Sorbonne Université, Paris F-75005, France
| | - Barbara Kirchner
- Mulliken Center for Theoretical Chemistry, University of Bonn, Beringstraße 4 + 6, Bonn D-53115, Germany
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5
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Pohl S, Fingerhut R, Thol M, Vrabec J, Span R. Equation of state for the Mie (λ r,6) fluid with a repulsive exponent from 11 to 13. J Chem Phys 2023; 158:084506. [PMID: 36859099 DOI: 10.1063/5.0133412] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/03/2023] Open
Abstract
An empirical multi-parameter equation of state in terms of the reduced Helmholtz energy is presented for the Mie (λr-6) fluid with a repulsive exponent λr from 11 to 13. The equation is fitted to an extensive dataset from molecular dynamics simulation as well as the second and third thermal virial coefficients. It is comprehensively compared with the SAFT-VR model and is a more accurate description of the considered fluid class. The equation is valid for reduced temperatures T/Tc from 0.55 to 4.5 and for reduced pressures of up to p/pc = 265. A good extrapolation behavior and the occurrence of a single Maxwell loop down to the vicinity of the triple point temperature are realized.
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Affiliation(s)
- Sven Pohl
- Thermodynamics, Ruhr-University Bochum, 44801 Bochum, Germany
| | - Robin Fingerhut
- Thermodynamics, Technical University of Berlin, 10587 Berlin, Germany
| | - Monika Thol
- Thermodynamics, Ruhr-University Bochum, 44801 Bochum, Germany
| | - Jadran Vrabec
- Thermodynamics, Technical University of Berlin, 10587 Berlin, Germany
| | - Roland Span
- Thermodynamics, Ruhr-University Bochum, 44801 Bochum, Germany
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Marx J, Kohns M, Langenbach K. Systematic study of vapour–liquid equilibria in binary mixtures of fluids with different polarity from molecular simulations. Mol Phys 2022. [DOI: 10.1080/00268976.2022.2141150] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Joshua Marx
- Chair of Thermal Separation Science (endowed professorship of the state Tyrol), University of Innsbruck, Innsbruck, Austria
- Laboratory of Engineering Thermodynamics, Technische Universität Kaiserslautern, Kaiserslautern, Germany
| | - Maximilian Kohns
- Laboratory of Engineering Thermodynamics, Technische Universität Kaiserslautern, Kaiserslautern, Germany
| | - Kai Langenbach
- Chair of Thermal Separation Science (endowed professorship of the state Tyrol), University of Innsbruck, Innsbruck, Austria
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7
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Ricci E, Minelli M, De Angelis MG. Modelling Sorption and Transport of Gases in Polymeric Membranes across Different Scales: A Review. MEMBRANES 2022; 12:857. [PMID: 36135877 PMCID: PMC9502097 DOI: 10.3390/membranes12090857] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/2022] [Revised: 08/24/2022] [Accepted: 08/27/2022] [Indexed: 06/02/2023]
Abstract
Professor Giulio C. Sarti has provided outstanding contributions to the modelling of fluid sorption and transport in polymeric materials, with a special eye on industrial applications such as membrane separation, due to his Chemical Engineering background. He was the co-creator of innovative theories such as the Non-Equilibrium Theory for Glassy Polymers (NET-GP), a flexible tool to estimate the solubility of pure and mixed fluids in a wide range of polymers, and of the Standard Transport Model (STM) for estimating membrane permeability and selectivity. In this review, inspired by his rigorous and original approach to representing membrane fundamentals, we provide an overview of the most significant and up-to-date modeling tools available to estimate the main properties governing polymeric membranes in fluid separation, namely solubility and diffusivity. The paper is not meant to be comprehensive, but it focuses on those contributions that are most relevant or that show the potential to be relevant in the future. We do not restrict our view to the field of macroscopic modelling, which was the main playground of professor Sarti, but also devote our attention to Molecular and Multiscale Hierarchical Modeling. This work proposes a critical evaluation of the different approaches considered, along with their limitations and potentiality.
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Affiliation(s)
- Eleonora Ricci
- Department of Civil, Chemical, Environmental and Materials Engineering (DICAM), Alma Mater Studiorum—University of Bologna, 40126 Bologna, Italy
| | - Matteo Minelli
- Department of Civil, Chemical, Environmental and Materials Engineering (DICAM), Alma Mater Studiorum—University of Bologna, 40126 Bologna, Italy
| | - Maria Grazia De Angelis
- Institute for Materials and Processes, School of Engineering, University of Edinburgh, Edinburgh EH9 3FB, UK
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8
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Antolović I, Vrabec J. Vapor–Liquid–Liquid Equilibria of Nitrogen + Ethane by Molecular Simulation. Ind Eng Chem Res 2022. [DOI: 10.1021/acs.iecr.1c04726] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ivan Antolović
- Thermodynamics and Process Engineering, Technical University Berlin, Berlin 10587, Germany
| | - Jadran Vrabec
- Thermodynamics and Process Engineering, Technical University Berlin, Berlin 10587, Germany
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9
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Kulkarni A, Fingerhut R, Kohns M, Hasse H, Vrabec J. Correction to “Molecular Modeling and Simulation of Vapor–Liquid Equilibria of Ethylene Oxide, Ethylene Glycol, and Water as Well as their Binary Mixtures”. Ind Eng Chem Res 2020. [DOI: 10.1021/acs.iecr.0c04937] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Aditya Kulkarni
- Laboratory of Engineering Thermodynamics (LTD), Technische Universität Kaiserslautern (TUK), 67663 Kaiserslautern, Germany
| | - Robin Fingerhut
- Thermodynamics and Process Engineering, Technical University of Berlin, 10587 Berlin, Germany
| | - Maximilian Kohns
- Laboratory of Engineering Thermodynamics (LTD), Technische Universität Kaiserslautern (TUK), 67663 Kaiserslautern, Germany
| | - Hans Hasse
- Laboratory of Engineering Thermodynamics (LTD), Technische Universität Kaiserslautern (TUK), 67663 Kaiserslautern, Germany
| | - Jadran Vrabec
- Thermodynamics and Process Engineering, Technical University of Berlin, 10587 Berlin, Germany
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10
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Kulkarni A, Bortz M, Küfer KH, Kohns M, Hasse H. Multicriteria Optimization of Molecular Models of Water Using a Reduced Units Approach. J Chem Theory Comput 2020; 16:5127-5138. [PMID: 32609517 DOI: 10.1021/acs.jctc.0c00301] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Multicriteria optimization (MCO) is used to parametrize molecular models of water. The set of the best possible compromises between different objectives, the Pareto set, is determined. Calculating Pareto sets for optimization problems involving molecular simulations is computationally expensive. Therefore, we use a novel, highly efficient method, which is based on the fact that numerical results from molecular simulations can be interpreted as dimensionless numbers. Hence, they carry information on an entire class of models in physical units. This approach was applied here for the MCO of water models of the "one-center Lennard-Jones + point charge" type, in which the objectives were the quality of the description of the vapor pressure, liquid density, and enthalpy of vaporization. The results were compared to models from the literature. Significant improvements were observed. The new optimization method for the development of molecular models is efficient, robust, and broadly applicable.
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Affiliation(s)
- Aditya Kulkarni
- Laboratory of Engineering Thermodynamics (LTD), Technische Universität Kaiserslautern (TUK), 67663 Kaiserslautern, Germany
| | - Michael Bortz
- Fraunhofer Institute for Industrial Mathematics (ITWM), 67663 Kaiserslautern, Germany
| | - Karl-Heinz Küfer
- Fraunhofer Institute for Industrial Mathematics (ITWM), 67663 Kaiserslautern, Germany
| | - Maximilian Kohns
- Laboratory of Engineering Thermodynamics (LTD), Technische Universität Kaiserslautern (TUK), 67663 Kaiserslautern, Germany
| | - Hans Hasse
- Laboratory of Engineering Thermodynamics (LTD), Technische Universität Kaiserslautern (TUK), 67663 Kaiserslautern, Germany
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11
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Ricci E, Vergadou N, Vogiatzis GG, De Angelis MG, Theodorou DN. Molecular Simulations and Mechanistic Analysis of the Effect of CO 2 Sorption on Thermodynamics, Structure, and Local Dynamics of Molten Atactic Polystyrene. Macromolecules 2020; 53:3669-3689. [PMID: 33828339 PMCID: PMC8016389 DOI: 10.1021/acs.macromol.0c00323] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2020] [Revised: 04/21/2020] [Indexed: 11/30/2022]
Abstract
A simulation strategy encompassing different scales was applied to the systematic study of the effects of CO2 uptake on the properties of atactic polystyrene (aPS) melts. The analysis accounted for the influence of temperature between 450 and 550 K, polymer molecular weights (M w) between 2100 and 31000 g/mol, and CO2 pressures up to 20 MPa on the volumetric, swelling, structural, and dynamic properties of the polymer as well as on the CO2 solubility and diffusivity by performing molecular dynamics (MD) simulations of the system in a fully atomistic representation. A hierarchical scheme was used for the generation of the higher M w polymer systems, which consisted of equilibration at a coarse-grained level of representation through efficient connectivity-altering Monte Carlo simulations, and reverse-mapping back to the atomistic representation, obtaining the configurations used for subsequent MD simulations. Sorption isotherms and associated swelling effects were determined by using an iterative procedure that incorporated a series of MD simulations in the NPT ensemble and the Widom test particle insertion method, while CO2 diffusion coefficients were extracted from long MD runs in the NVE ensemble. Solubility and diffusivity compared favorably with experimental results and with predictions of the Sanchez-Lacombe equation of state, which was reparametrized to capture the M w dependence of polymer properties with greater accuracy. Structural features of the polymer matrix were correctly reproduced by the simulations, and the effects of gas concentration and M w on structure and local dynamics were thoroughly investigated. In the presence of CO2, a significant acceleration of the segmental dynamics of the polymer occurred, more pronouncedly at low M w. The speed-up effect caused by the swelling agent was not limited to the chain ends but affected the whole chain in a similar fashion.
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Affiliation(s)
- Eleonora Ricci
- Department of Civil, Chemical, Environmental and Materials Engineering, University of Bologna, Bologna, Italy
| | - Niki Vergadou
- Institute of Nanoscience and Nanotechnology, National Center for Scientific Research "Demokritos", Athens, Greece
| | - Georgios G Vogiatzis
- Department of Mechanical Engineering, Eindhoven University of Technology, Eindhoven, The Netherlands
| | - Maria Grazia De Angelis
- Department of Civil, Chemical, Environmental and Materials Engineering, University of Bologna, Bologna, Italy
| | - Doros N Theodorou
- School of Chemical Engineering, National Technical University of Athens, Athens, Greece
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12
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Stephan S, Thol M, Vrabec J, Hasse H. Thermophysical Properties of the Lennard-Jones Fluid: Database and Data Assessment. J Chem Inf Model 2019; 59:4248-4265. [DOI: 10.1021/acs.jcim.9b00620] [Citation(s) in RCA: 55] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Simon Stephan
- Laboratory of Engineering Thermodynamics (LTD), TU Kaiserslautern, 67663 Kaiserslautern, Germany
| | - Monika Thol
- Thermodynamics, Ruhr University Bochum, 44801 Bochum, Germany
| | - Jadran Vrabec
- Thermodynamics and Process Engineering, TU Berlin, 10587 Berlin, Germany
| | - Hans Hasse
- Laboratory of Engineering Thermodynamics (LTD), TU Kaiserslautern, 67663 Kaiserslautern, Germany
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13
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Vergadou N, Theodorou DN. Molecular Modeling Investigations of Sorption and Diffusion of Small Molecules in Glassy Polymers. MEMBRANES 2019; 9:E98. [PMID: 31398889 PMCID: PMC6723301 DOI: 10.3390/membranes9080098] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/12/2019] [Revised: 07/22/2019] [Accepted: 07/23/2019] [Indexed: 11/16/2022]
Abstract
With a wide range of applications, from energy and environmental engineering, such as in gas separations and water purification, to biomedical engineering and packaging, glassy polymeric materials remain in the core of novel membrane and state-of the art barrier technologies. This review focuses on molecular simulation methodologies implemented for the study of sorption and diffusion of small molecules in dense glassy polymeric systems. Basic concepts are introduced and systematic methods for the generation of realistic polymer configurations are briefly presented. Challenges related to the long length and time scale phenomena that govern the permeation process in the glassy polymer matrix are described and molecular simulation approaches developed to address the multiscale problem at hand are discussed.
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Affiliation(s)
- Niki Vergadou
- Molecular Thermodynamics and Modelling of Materials Laboratory, Institute of Nanoscience and Nanotechnology, National Center for Scientific Research Demokritos, Aghia Paraskevi Attikis, GR-15310 Athens, Greece.
| | - Doros N Theodorou
- School of Chemical Engineering, National Technical University of Athens, GR 15780 Athens, Greece
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14
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Bauer G, Gross J. Phase Equilibria of Solid and Fluid Phases from Molecular Dynamics Simulations with Equilibrium and Nonequilibrium Free Energy Methods. J Chem Theory Comput 2019; 15:3778-3792. [DOI: 10.1021/acs.jctc.8b01023] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Gernot Bauer
- Institute of Thermodynamics and Thermal Process Engineering, University of Stuttgart, Pfaffenwaldring 9, D-70569 Stuttgart, Germany,
| | - Joachim Gross
- Institute of Thermodynamics and Thermal Process Engineering, University of Stuttgart, Pfaffenwaldring 9, D-70569 Stuttgart, Germany,
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15
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Zhang K, Jia N, Liu L. Adsorption Thicknesses of Confined Pure and Mixing Fluids in Nanopores. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:12815-12826. [PMID: 30298741 DOI: 10.1021/acs.langmuir.8b02925] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
In this paper, adsorption thicknesses of confined pure and mixing fluids in nanopores are quantitatively determined and their influential factors are specifically evaluated. First, a new analytical formulation is developed thermodynamically to calculate the adsorption thicknesses. Second, a new generalized equation of state (EOS), which considers the confinement effect-induced phenomena, is developed analytically for calculating the thermodynamic confined fluid phase behavior. Third, the modified model based on the generalized EOS and coupled with the parachor model is applied to calculate the vapor-liquid equilibrium (VLE) and fluid adsorptions for the pure CO2, alkanes of C1-C10, and two mixtures of CO2-C10H22 and CH4-C10H22 in nanopores. Finally, the following five important factors are studied to evaluate their effects on the adsorption thickness: temperature, pressure, pore radius, wall-effect distance, and feed gas-to-liquid ratio (FGLR). The proposed modified EOS is found to be accurate for the VLE and adsorption isotherm calculations. The adsorption thicknesses of confined pure or mixing alkanes are increased with the increasing carbon number but decreased with the temperature increase. For the alkanes of C1-C10, the degree of temperature effect is strengthened with the carbon number increase. Moreover, the adsorption thicknesses are significantly decreased with the pore radius increase until rp = 50 nm, after which they have slight changes or are even constant at any pore radii. On the other hand, the wall-effect distance (δp) increase causes the adsorption thickness to be linearly increased at δp/ rp ≥ 0.02. In addition, the effects of the FGLR and pressure on the adsorption thicknesses at the nanoscale are found to be negligible.
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16
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Cresswell AJ, Wheatley RJ, Wilkinson RD, Graham RS. Molecular simulation of the thermophysical properties and phase behaviour of impure CO 2 relevant to CCS. Faraday Discuss 2018; 192:415-436. [PMID: 27471835 DOI: 10.1039/c6fd00026f] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Impurities from the CCS chain can greatly influence the physical properties of CO2. This has important design, safety and cost implications for the compression, transport and storage of CO2. There is an urgent need to understand and predict the properties of impure CO2 to assist with CCS implementation. However, CCS presents demanding modelling requirements. A suitable model must both accurately and robustly predict CO2 phase behaviour over a wide range of temperatures and pressures, and maintain that predictive power for CO2 mixtures with numerous, mutually interacting chemical species. A promising technique to address this task is molecular simulation. It offers a molecular approach, with foundations in firmly established physical principles, along with the potential to predict the wide range of physical properties required for CCS. The quality of predictions from molecular simulation depends on accurate force-fields to describe the interactions between CO2 and other molecules. Unfortunately, there is currently no universally applicable method to obtain force-fields suitable for molecular simulation. In this paper we present two methods of obtaining force-fields: the first being semi-empirical and the second using ab initio quantum-chemical calculations. In the first approach we optimise the impurity force-field against measurements of the phase and pressure-volume behaviour of CO2 binary mixtures with N2, O2, Ar and H2. A gradient-free optimiser allows us to use the simulation itself as the underlying model. This leads to accurate and robust predictions under conditions relevant to CCS. In the second approach we use quantum-chemical calculations to produce ab initio evaluations of the interactions between CO2 and relevant impurities, taking N2 as an exemplar. We use a modest number of these calculations to train a machine-learning algorithm, known as a Gaussian process, to describe these data. The resulting model is then able to accurately predict a much broader set of ab initio force-field calculations at comparatively low numerical cost. Although our method is not yet ready to be implemented in a molecular simulation, we outline the necessary steps here. Such simulations have the potential to deliver first-principles simulation of the thermodynamic properties of impure CO2, without fitting to experimental data.
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Affiliation(s)
| | | | - Richard D Wilkinson
- School of Mathematics and Statistics, University of Sheffield, Sheffield, S10 2TN, UK
| | - Richard S Graham
- School of Mathematical Sciences, University of Nottingham, Nottingham NG7 2RD, UK.
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17
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Langenbach K, Heilig M, Horsch M, Hasse H. Study of homogeneous bubble nucleation in liquid carbon dioxide by a hybrid approach combining molecular dynamics simulation and density gradient theory. J Chem Phys 2018; 148:124702. [DOI: 10.1063/1.5022231] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Affiliation(s)
- K. Langenbach
- Laboratory of Engineering Thermodynamics, University of Kaiserslautern, Kaiserslautern D-67663, Germany
| | - M. Heilig
- ROM, Digitalization in Research and Development, BASF SE, Ludwigshafen D-67056, Germany
| | - M. Horsch
- Laboratory of Engineering Thermodynamics, University of Kaiserslautern, Kaiserslautern D-67663, Germany
| | - H. Hasse
- Laboratory of Engineering Thermodynamics, University of Kaiserslautern, Kaiserslautern D-67663, Germany
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18
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Langenbach K. Co-Oriented Fluid Functional Equation for Electrostatic interactions (COFFEE). Chem Eng Sci 2017. [DOI: 10.1016/j.ces.2017.08.025] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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19
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20
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Muñoz-Muñoz YM, Hsieh CM, Vrabec J. Understanding the Differing Fluid Phase Behavior of Cyclohexane + Benzene and Their Hydroxylated or Aminated Forms. J Phys Chem B 2017; 121:5374-5384. [DOI: 10.1021/acs.jpcb.7b02494] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | - Chieh-Ming Hsieh
- Department
of Chemical and Materials Engineering, National Central University, Jhongli 32001, Taiwan
| | - Jadran Vrabec
- Thermodynamics
and Energy Technology, University of Paderborn, 33098 Paderborn, Germany
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21
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22
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Thol M, Rutkai G, Köster A, Miroshnichenko S, Wagner W, Vrabec J, Span R. Equation of state for 1,2-dichloroethane based on a hybrid data set. Mol Phys 2016. [DOI: 10.1080/00268976.2016.1262557] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Monika Thol
- Lehrstuhl für Thermodynamik, Ruhr-Universität Bochum, Bochum, Germany
| | - Gábor Rutkai
- Lehrstuhl für Thermodynamik und Energietechnik, Universität Paderborn, Paderborn, Germany
| | - Andreas Köster
- Lehrstuhl für Thermodynamik und Energietechnik, Universität Paderborn, Paderborn, Germany
| | | | - Wolfgang Wagner
- Lehrstuhl für Thermodynamik, Ruhr-Universität Bochum, Bochum, Germany
| | - Jadran Vrabec
- Lehrstuhl für Thermodynamik und Energietechnik, Universität Paderborn, Paderborn, Germany
| | - Roland Span
- Lehrstuhl für Thermodynamik, Ruhr-Universität Bochum, Bochum, Germany
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23
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Rutkai G, Thol M, Span R, Vrabec J. How well does the Lennard-Jones potential represent the thermodynamic properties of noble gases? Mol Phys 2016. [DOI: 10.1080/00268976.2016.1246760] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Gábor Rutkai
- Lehrstuhl für Thermodynamik und Energietechnik, Universität Paderborn, Paderborn, Germany
| | - Monika Thol
- Lehrstuhl für Thermodynamik, Ruhr-Universität Bochum, Bochum, Germany
| | - Roland Span
- Lehrstuhl für Thermodynamik, Ruhr-Universität Bochum, Bochum, Germany
| | - Jadran Vrabec
- Lehrstuhl für Thermodynamik und Energietechnik, Universität Paderborn, Paderborn, Germany
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24
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Köster A, Spura T, Rutkai G, Kessler J, Wiebeler H, Vrabec J, Kühne TD. Assessing the accuracy of improved force-matched water models derived fromAb initiomolecular dynamics simulations. J Comput Chem 2016; 37:1828-38. [DOI: 10.1002/jcc.24398] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2015] [Revised: 04/08/2016] [Accepted: 04/14/2016] [Indexed: 11/10/2022]
Affiliation(s)
- Andreas Köster
- Thermodynamics and Energy Technology; Department of Mechanical Engineering, University of Paderborn; Warburger Str. 100 Paderborn D-33098 Germany
| | - Thomas Spura
- Dynamics of Condensed Matter, Department of Chemistry; University of Paderborn; Warburger Str. 100 Paderborn D-33098 Germany
| | - Gábor Rutkai
- Thermodynamics and Energy Technology; Department of Mechanical Engineering, University of Paderborn; Warburger Str. 100 Paderborn D-33098 Germany
| | - Jan Kessler
- Dynamics of Condensed Matter, Department of Chemistry; University of Paderborn; Warburger Str. 100 Paderborn D-33098 Germany
| | - Hendrik Wiebeler
- Dynamics of Condensed Matter, Department of Chemistry; University of Paderborn; Warburger Str. 100 Paderborn D-33098 Germany
| | - Jadran Vrabec
- Thermodynamics and Energy Technology; Department of Mechanical Engineering, University of Paderborn; Warburger Str. 100 Paderborn D-33098 Germany
| | - Thomas D. Kühne
- Dynamics of Condensed Matter, Department of Chemistry; University of Paderborn; Warburger Str. 100 Paderborn D-33098 Germany
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25
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Kohns M, Reiser S, Horsch M, Hasse H. Solvent activity in electrolyte solutions from molecular simulation of the osmotic pressure. J Chem Phys 2016; 144:084112. [DOI: 10.1063/1.4942500] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Maximilian Kohns
- Laboratory of Engineering Thermodynamics, University of Kaiserslautern, Erwin-Schrödinger Str. 44, D-67663 Kaiserslautern, Germany
| | - Steffen Reiser
- Laboratory of Engineering Thermodynamics, University of Kaiserslautern, Erwin-Schrödinger Str. 44, D-67663 Kaiserslautern, Germany
| | - Martin Horsch
- Laboratory of Engineering Thermodynamics, University of Kaiserslautern, Erwin-Schrödinger Str. 44, D-67663 Kaiserslautern, Germany
| | - Hans Hasse
- Laboratory of Engineering Thermodynamics, University of Kaiserslautern, Erwin-Schrödinger Str. 44, D-67663 Kaiserslautern, Germany
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26
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Nieto-Draghi C, Fayet G, Creton B, Rozanska X, Rotureau P, de Hemptinne JC, Ungerer P, Rousseau B, Adamo C. A General Guidebook for the Theoretical Prediction of Physicochemical Properties of Chemicals for Regulatory Purposes. Chem Rev 2015; 115:13093-164. [PMID: 26624238 DOI: 10.1021/acs.chemrev.5b00215] [Citation(s) in RCA: 72] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Carlos Nieto-Draghi
- IFP Energies nouvelles , 1 et 4 avenue de Bois-Préau, 92852 Rueil-Malmaison, France
| | - Guillaume Fayet
- INERIS, Parc Technologique Alata, BP2 , 60550 Verneuil-en-Halatte, France
| | - Benoit Creton
- IFP Energies nouvelles , 1 et 4 avenue de Bois-Préau, 92852 Rueil-Malmaison, France
| | - Xavier Rozanska
- Materials Design S.A.R.L. , 18, rue de Saisset, 92120 Montrouge, France
| | - Patricia Rotureau
- INERIS, Parc Technologique Alata, BP2 , 60550 Verneuil-en-Halatte, France
| | | | - Philippe Ungerer
- Materials Design S.A.R.L. , 18, rue de Saisset, 92120 Montrouge, France
| | - Bernard Rousseau
- Laboratoire de Chimie-Physique, Université Paris Sud , UMR 8000 CNRS, Bât. 349, 91405 Orsay Cedex, France
| | - Carlo Adamo
- Institut de Recherche Chimie Paris, PSL Research University, CNRS, Chimie Paristech , 11 rue P. et M. Curie, F-75005 Paris, France.,Institut Universitaire de France , 103 Boulevard Saint Michel, F-75005 Paris, France
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27
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Sugii T, Ishii E, Müller-Plathe F. Solubility of Carbon Dioxide in Pentaerythritol Hexanoate: Molecular Dynamics Simulation of a Refrigerant-Lubricant Oil System. J Phys Chem B 2015; 119:12274-80. [PMID: 26287696 DOI: 10.1021/acs.jpcb.5b06459] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We have investigated the solubility and the solvation structure between a refrigerant (carbon dioxide, CO2) and a lubricant oil (pentaerythritol hexanoate, PEC6) by molecular dynamics simulations. First, to investigate the solubility, we calculated the vapor-liquid equilibrium pressure. The chemical potential of the liquid phase and the gas phase were calculated, and the equilibrium state was obtained from the crossing point of these chemical potentials. The equilibrium pressures agreed well with experimental data over a wide range of temperatures and mole fractions of CO2. Second, the solvation structure was also investigated on a molecular scale. We found the following characteristics. First, the tails of the lubricant oil are relatively rigid inside the ester groups but flexible beyond. Second, CO2 molecules barely enter the lubricant core as delimited by the ester groups. Third, the double-bonded oxygen atoms of the ester groups are good sorption sites for CO2. Fourth, only a few CO2 molecules are attached to more than one carbonyl oxygen simultaneously. Finally, there is also significant unspecific sorption of CO2 in the alkane tail region. These results indicate that increasing the size of the rigid lubricant core would probably decrease the solubility, whereas increasing the number of polar groups would increase it.
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Affiliation(s)
- Taisuke Sugii
- Center for Technology Innovation - Mechanical Engineering, Research & Development Group, Hitachi, Ltd. , 832-2, Horiguchi, Hitachinaka, Ibaraki 312-0034, Japan
| | - Eiji Ishii
- Center for Technology Innovation - Mechanical Engineering, Research & Development Group, Hitachi, Ltd. , 832-2, Horiguchi, Hitachinaka, Ibaraki 312-0034, Japan
| | - Florian Müller-Plathe
- Eduard-Zintl-Institut für Anorganische und Physikalische Chemie and Center of Smart Interfaces, Technische Universität Darmstadt , Alarich-Weiss-Straße 4, D-64287 Darmstadt, Germany
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28
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Langenbach K, Engin C, Reiser S, Horsch M, Hasse H. On the simultaneous description of h-bonding and dipolar interactions with point charges in force field models. AIChE J 2015. [DOI: 10.1002/aic.14820] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Kai Langenbach
- Laboratory of Engineering Thermodynamics; University of Kaiserslautern; 67663 Kaiserslautern Germany
| | - Cemal Engin
- Laboratory of Engineering Thermodynamics; University of Kaiserslautern; 67663 Kaiserslautern Germany
| | - Steffen Reiser
- Laboratory of Engineering Thermodynamics; University of Kaiserslautern; 67663 Kaiserslautern Germany
| | - Martin Horsch
- Laboratory of Engineering Thermodynamics; University of Kaiserslautern; 67663 Kaiserslautern Germany
| | - Hans Hasse
- Laboratory of Engineering Thermodynamics; University of Kaiserslautern; 67663 Kaiserslautern Germany
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29
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Horsch M, Hasse H. Molecular Modeling and Simulation in Fluid Process Engineering. CHEMBIOENG REVIEWS 2015. [DOI: 10.1002/cben.201500010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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30
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Niethammer C, Becker S, Bernreuther M, Buchholz M, Eckhardt W, Heinecke A, Werth S, Bungartz HJ, Glass CW, Hasse H, Vrabec J, Horsch M. ls1 mardyn: The Massively Parallel Molecular Dynamics Code for Large Systems. J Chem Theory Comput 2014; 10:4455-64. [PMID: 26588142 DOI: 10.1021/ct500169q] [Citation(s) in RCA: 89] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The molecular dynamics simulation code ls1 mardyn is presented. It is a highly scalable code, optimized for massively parallel execution on supercomputing architectures and currently holds the world record for the largest molecular simulation with over four trillion particles. It enables the application of pair potentials to length and time scales that were previously out of scope for molecular dynamics simulation. With an efficient dynamic load balancing scheme, it delivers high scalability even for challenging heterogeneous configurations. Presently, multicenter rigid potential models based on Lennard-Jones sites, point charges, and higher-order polarities are supported. Due to its modular design, ls1 mardyn can be extended to new physical models, methods, and algorithms, allowing future users to tailor it to suit their respective needs. Possible applications include scenarios with complex geometries, such as fluids at interfaces, as well as nonequilibrium molecular dynamics simulation of heat and mass transfer.
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Affiliation(s)
- Christoph Niethammer
- High Performance Computing Center Stuttgart , Nobelstr. 19, 70569 Stuttgart, Germany
| | - Stefan Becker
- University of Kaiserslautern , Laboratory of Engineering Thermodynamics, Erwin-Schrödinger-Str. 44, 67663 Kaiserslautern, Germany
| | - Martin Bernreuther
- High Performance Computing Center Stuttgart , Nobelstr. 19, 70569 Stuttgart, Germany
| | - Martin Buchholz
- TU München , Chair for Scientific Computing in Computer Science, Boltzmannstr. 3, 85748 Garching, Germany
| | - Wolfgang Eckhardt
- TU München , Chair for Scientific Computing in Computer Science, Boltzmannstr. 3, 85748 Garching, Germany
| | - Alexander Heinecke
- TU München , Chair for Scientific Computing in Computer Science, Boltzmannstr. 3, 85748 Garching, Germany
| | - Stephan Werth
- University of Kaiserslautern , Laboratory of Engineering Thermodynamics, Erwin-Schrödinger-Str. 44, 67663 Kaiserslautern, Germany
| | - Hans-Joachim Bungartz
- TU München , Chair for Scientific Computing in Computer Science, Boltzmannstr. 3, 85748 Garching, Germany
| | - Colin W Glass
- High Performance Computing Center Stuttgart , Nobelstr. 19, 70569 Stuttgart, Germany
| | - Hans Hasse
- University of Kaiserslautern , Laboratory of Engineering Thermodynamics, Erwin-Schrödinger-Str. 44, 67663 Kaiserslautern, Germany
| | - Jadran Vrabec
- University of Paderborn , Laboratory of Thermodynamics and Energy Technology, Warburger Str. 100, 33098 Paderborn, Germany
| | - Martin Horsch
- University of Kaiserslautern , Laboratory of Engineering Thermodynamics, Erwin-Schrödinger-Str. 44, 67663 Kaiserslautern, Germany
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31
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Horsch M, Hasse H. Reprint of: Molecular simulation of nano-dispersed fluid phases. Chem Eng Sci 2014. [DOI: 10.1016/j.ces.2014.05.033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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32
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Horsch M, Hasse H. Molekulare Modellierung und Simulation in der Fluidverfahrenstechnik. CHEM-ING-TECH 2014. [DOI: 10.1002/cite.201400036] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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33
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Eslami H, Kesik M, Karimi-Varzaneh HA, Müller-Plathe F. Sorption and diffusion of carbon dioxide and nitrogen in poly(methyl methacrylate). J Chem Phys 2014; 139:124902. [PMID: 24089799 DOI: 10.1063/1.4821585] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Molecular dynamics simulations are performed to determine the solubility and diffusion coefficient of carbon dioxide and nitrogen in poly(methyl methacrylate) (PMMA). The solubilities of CO2 in the polymer are calculated employing our grand canonical ensemble simulation method, fixing the target excess chemical potential of CO2 in the polymer and varying the number of CO2 molecules in the polymer matrix till establishing equilibrium. It is shown that the calculated sorption isotherms of CO2 in PMMA, employing this method well agrees with experiment. Our results on the diffusion coefficients of CO2 and N2 in PMMA are shown to obey a common hopping mechanism. It is shown that the higher solubility of CO2 than that of N2 is a consequence of more attractive interactions between the carbonyl group of polymer and the sorbent. While the residence time of CO2 beside the carbonyl group of polymer is about three times higher than that of N2, the diffusion coefficient of CO2 in PMMA is higher than that of N2. The higher diffusion coefficient of CO2, compared to N2, in PMMA is shown to be due to the higher (≈3 times) swelling of polymer upon CO2 uptake.
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Affiliation(s)
- Hossein Eslami
- Department of Chemistry, College of Sciences, Persian Gulf University, Boushehr 75168, Iran
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34
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35
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Reiser S, Deublein S, Vrabec J, Hasse H. Molecular dispersion energy parameters for alkali and halide ions in aqueous solution. J Chem Phys 2014; 140:044504. [DOI: 10.1063/1.4858392] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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36
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Werth S, Rutkai G, Vrabec J, Horsch M, Hasse H. Long-range correction for multi-site Lennard-Jones models and planar interfaces. Mol Phys 2013. [DOI: 10.1080/00268976.2013.861086] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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37
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Sanchez JMC, Danner T, Gross J. Grand canonical Monte Carlo simulations of vapor-liquid equilibria using a bias potential from an analytic equation of state. J Chem Phys 2013; 138:234106. [DOI: 10.1063/1.4808032] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
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38
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39
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Deublein S, Metzler P, Vrabec J, Hasse H. Automated development of force fields for the calculation of thermodynamic properties: acetonitrile as a case study. MOLECULAR SIMULATION 2013. [DOI: 10.1080/08927022.2012.705434] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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40
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Merker T, Hsieh CM, Lin ST, Hasse H, Vrabec J. Fluid-phase coexistence for the oxidation of CO2expanded cyclohexane: Experiment, molecular simulation, and COSMO-SAC. AIChE J 2013. [DOI: 10.1002/aic.13986] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- T. Merker
- Laboratory of Engineering Thermodynamics; University of Kaiserslautern; 67663; Kaiserslautern; Germany
| | - C.-M. Hsieh
- Dept. of Chemical Engineering; National Taiwan University; 10617; Taipei; Taiwan
| | - S.-T. Lin
- Dept. of Chemical Engineering; National Taiwan University; 10617; Taipei; Taiwan
| | - H. Hasse
- Laboratory of Engineering Thermodynamics; University of Kaiserslautern; 67663; Kaiserslautern; Germany
| | - J. Vrabec
- Thermodynamics and Energy Technology; University of Paderborn; 33098; Paderborn; Germany
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41
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Moodley S, Johansson E, Bolton K, Ramjugernath D. Phase-dependent energy cross-parameters in a monatomic binary fluid system. MOLECULAR SIMULATION 2012. [DOI: 10.1080/08927022.2012.659180] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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42
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Huang YL, Merker T, Heilig M, Hasse H, Vrabec J. Molecular Modeling and Simulation of Vapor–Liquid Equilibria of Ethylene Oxide, Ethylene Glycol, and Water as Well as their Binary Mixtures. Ind Eng Chem Res 2012. [DOI: 10.1021/ie300248z] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Y.-L. Huang
- Thermodynamics and Energy Technology, University of Paderborn, 33098 Paderborn, Germany
| | - T. Merker
- Laboratory of Engineering Thermodynamics, University of Kaiserslautern, 67633 Kaiserslautern,
Germany
| | - M. Heilig
- GCP Chemical and
Process Engineering, BASF SE, Ludwigshafen,
Germany
| | - H. Hasse
- Laboratory of Engineering Thermodynamics, University of Kaiserslautern, 67633 Kaiserslautern,
Germany
| | - J. Vrabec
- Thermodynamics and Energy Technology, University of Paderborn, 33098 Paderborn, Germany
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43
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Deublein S, Eckl B, Stoll J, Lishchuk S, Guevara-Carrion G, Glass C, Merker T, Bernreuther M, Hasse H, Vrabec J. ms2: Ein Werkzeug zur Berechnung thermodynamischer Stoffeigenschaften mittels molekularer Simulation. CHEM-ING-TECH 2011. [DOI: 10.1002/cite.201100079] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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44
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Engin C, Vrabec J, Hasse H. On the difference between a point multipole and an equivalent linear arrangement of point charges in force field models for vapour–liquid equilibria; partial charge based models for 59 real fluids. Mol Phys 2011. [DOI: 10.1080/00268976.2011.601604] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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45
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Patel S, Wilding WV, Rowley RL. The use of two-phase molecular dynamics simulations to determine the phase behavior and critical point of propane molecular models. J Chem Phys 2011; 134:024101. [DOI: 10.1063/1.3528117] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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46
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Thermodynamic Properties for Applications in Chemical Industry via Classical Force Fields. MULTISCALE MOLECULAR METHODS IN APPLIED CHEMISTRY 2011; 307:201-49. [DOI: 10.1007/128_2011_164] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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47
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Eslami H, Mehdipour N. Grand canonical ensemble molecular dynamics simulation of water solubility in polyamide-6,6. Phys Chem Chem Phys 2010; 13:669-73. [PMID: 21031194 DOI: 10.1039/c0cp00910e] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Grand canonical ensemble molecular dynamics simulation is employed to calculate the solubility of water in polyamide-6,6. It is shown that performing two separate simulations, one in the polymeric phase and one in the gaseous phase, is sufficient to find the phase coexistence point. In this method, the chemical potential of water in the polymer phase is expanded as a first-order Taylor series in terms of pressure. Knowing the chemical potential of water in the polymer phase in terms of pressure, another simulation for water in the gaseous phase, in the grand canonical ensemble, is done in which the target chemical potential is set in terms of pressure in the gas phase. The phase coexistence point can easily be calculated from the results of these two independent simulations. Our calculated sorption isotherms and solubility coefficients of water in polyamide-6,6, over a wide range of temperatures and pressures, agree with experimental data.
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Affiliation(s)
- Hossein Eslami
- Department of Chemistry, College of Sciences, Persian Gulf University, Boushehr 75168, Iran.
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48
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Eslami H, Mojahedi F, Moghadasi J. Molecular dynamics simulation with weak coupling to heat and material baths. J Chem Phys 2010; 133:084105. [DOI: 10.1063/1.3474951] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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49
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50
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Merker T, Engin C, Vrabec J, Hasse H. Molecular model for carbon dioxide optimized to vapor-liquid equilibria. J Chem Phys 2010; 132:234512. [DOI: 10.1063/1.3434530] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
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