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Theses

Molecular Modeling of Interfacial Phenomena

Abstract : The tools of numerical simulation enable the analysis of interfaces at themolecular scale, both in terms of their structure and their dynamic behavior.Thus, in my thesis work, I developed the PYTIM software that includes the mostpopular procedures for interfacial analysis at the molecular level, providing asolid foundation for research work on surfaces and interfaces.Using these methods, I investigated the dynamic behavior of molecules at theinterfaces of different biological and atmospheric systems of interest. Indoing so, I studied the correlation between the dynamics of molecules on thesurface and the corresponding intermolecular interactions. In addition, Iworked on the calculation of pressure profiles in simulated systems. Inparticular, the localization of an inherently non-local quantity, the pressure,represents a considerable technical difficulty. I have shown that the pressureprofiles can be calculated in systems containing point charges via the Harasimacontour with mesh Ewald methods (PME). Moreover, I showed how the rigidconstraints often used in simulations introduce a coupling between thetranslational degrees of freedom and the rotational degrees of freedom. Theconsequence of this coupling is that the kinetic energy tensor is no longerconstant, even in equilibrium systems, which -- if neglected -- can introducesignificant errors in the calculation of the surface tension.The methods developed during my thesis work provided means to study variousproblems, such as the distribution of the surface tension near the interface,the relation between the spinodal pressure and the minimum of the lateralpressure profile. They also enabled the investigation of the possible linksbetween the lateral pressure profiles and the mechanism of action of anestheticmolecules, thus providing a molecular basis for the hypothesis ofCantor.Finally, I also studied gas/solid equilibrium characterizing, by Monte Carlosimulation in the grand canonical ensemble, the trapping of ammonia moleculesin a clathrate under conditions of pressure and temperature representative ofextraterrestrial environments.
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Balázs Fábián. Molecular Modeling of Interfacial Phenomena. Other. Université Bourgogne Franche-Comté; Budapesti Műszaki és Gazdaságtudományi Egyetem (Budapest), 2018. English. ⟨NNT : 2018UBFCD041⟩. ⟨tel-02550813⟩

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