Publications by authors named "Paul N M Hoang"

The effect of four general anesthetic molecules, i.e., chloroform, halothane, diethyl ether and enflurane, on the properties of a fully hydrated dipalmitoylphosphatidylcholine (DPPC) membrane is studied in detail by long molecular dynamics simulations.

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We use molecular dynamics simulations to determine the melting point of ice I(h) for the polarizable POL3 water force field (Dang, L. X. J.

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The grand canonical Monte Carlo method is used to simulate the adsorption isotherms of water molecules on different types of model soot particles. These soot models are constructed by first removing atoms from onion-fullerene structures in order to create randomly distributed pores inside the soot, and then performing molecular dynamics simulations, based on the reactive adaptive intermolecular reactive empirical bond order (AIREBO) description of the interaction between carbon atoms, to optimize the resulting structures. The obtained results clearly show that the main driving force of water adsorption on soot is the possibility of the formation of new water-water hydrogen bonds with the already adsorbed water molecules.

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Article Synopsis
  • The adsorption study of benzaldehyde on ice used both experiments and Monte Carlo simulations, showing a strong correlation between the two with regards to adsorption isotherms.
  • The enthalpy of adsorption for benzaldehyde on ice was calculated at about -61.4 kJ/mol experimentally and -59.4 kJ/mol through simulations, indicating a strong affinity of benzaldehyde for ice compared to smaller aldehydes.
  • At low coverage, benzaldehyde molecules lie parallel to the ice surface, but as coverage increases, some adopt perpendicular orientations, leading to interactions between the molecules and the ice surface as well as among the molecules themselves.
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In this paper, molecular dynamic simulations are used to study the adsorption of water molecules on partially oxidized graphite surfaces containing COOH and OH sites. More specially, the competition between the OH and COOH sites with respect to water adsorption is characterized at three different temperatures (200, 250 and 300 K). The simulations show a strong preferential clustering of the water molecules around the COOH sites irrespective of the temperature.

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The adsorption isotherm of acetone at the surface of I(h) ice has been determined by a set of grand canonical Monte Carlo simulations at 200 K, by varying the chemical potential of acetone in the simulations. The obtained isotherm can be described by the Langmuir theory up to a certain relative pressure value (i.e.

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The adsorption isotherm of methanol on ice at 200 K has been determined both experimentally and by using the Grand Canonical Monte Carlo computer simulation method. The experimental and simulated isotherms agree well with each other; their deviations can be explained by a small (about 5 K) temperature shift in the simulation data and, possibly, by the non-ideality of the ice surface in the experimental situation. The analysis of the results has revealed that the saturated adsorption layer is monomolecular.

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In this paper, we present results from molecular dynamic simulations devoted to the characterization of the interaction between water molecules and hydroxylated graphite surfaces considered as models for surfaces of soot emitted by aircraft. The hydroxylated graphite surfaces are modeled by anchoring several OH groups on an infinite graphite plane. The molecular dynamics simulations are based on a classical potential issued from quantum chemical calculations.

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