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Ehrens, Julian: Classical molecular dynamics simulations of carbon nanomembranes using LAMMPS - Methods for mechanical properties, internal structure and permeation s [...]. 2022
Inhalt
Abbreviations
Introduction
Classical molecular dynamics theoretical background
Effective interatomic potentials
Simulation constraints and specifics
Boundary conditions
Non-periodic boundary conditions
Periodic boundary conditions
Molecular dynamics ensembles
Microcanonical (NVE) ensemble
Canonical (NVT) ensemble
Isothermal-isobaric (NPT) ensemble
Equations of motion and time integration
Temperature
Pressure
Thermo- and barostats
Berendsen thermostat
Berendsen barostat
Nosé-Hoover thermostat
Andersen barostat
Parrinello-Rahman barostat
Nosé-Hoover barostat
Langevin thermostat
Other methods
Solvent and water models
Self-assembled monolayers (SAMs)
History and use of carbon nanomembranes (CNMs)
Experimental characterization of SAMs and CNMs
Infrared (IR) and infrared reflection absorption spectroscopy (IRRAS)
Scanning electron (SEM) and helium ion (HIM) microscopy
Scanning tunneling microscopy (STM)
Atomic force microscopy (AFM)
Thermal desorption spectroscopy (TDS)
X-ray photoelectron spectroscopy (XPS)
Near edge X-Ray absorption fine structure (NEXAFS)
High resolution electron energy loss spectroscopy (HREELS)
Bulge testing
Nanoindentation
Electronic transport measurements
Capacitance measurements in nanocapacitors
Liquid/gas permeation
Molecular dynamics modeling of CNMs and mechanical properties
Modeling the electron-induced cross-linking of SAMs
Measure of elasticity: The Young's modulus
Modeling of the stress-strain method
Volume ambiguity
Vertical momentum dynamics
Additional lateral momenta
Missing molecules
Barostated dynamics
Membranes from aliphatic SAMs
Molecular dynamics modeling of nanoindentation
Simulation setup
Qualitative insights
Determination of the Young's modulus
Ring statistics and aromaticity
Simulation setup
Results
Simulated atomic force microscopy (AFM) images
Simulation setup
Qualitative insights
Water permeation analysis
Prerequisite setup to initialize CNM and water geometry
Molecular dynamics setup of permeation analysis
Qualitative results from simulated water permeation
Conclusions and outlook
Appendix
Investigated aromatic precursor SAMs
LAMMPS input scripts and tools
List of Figures
List of Tables
Bibliography