NDLI: Molecular Dynamics Simulation for the Impact of N-Decanol Surfactants on the Liquid-Vapor Interface of Lithium Bromide Aqueous Solution

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Zhu, Beibei Gao, Hongtao
Copyright Year	2010
Abstract	In order to investigate the effect of n-decanol, a kind of alcohol surfactants, on the absorption of water vapor into lithium bromide aqueous solution, this study focused on microscopic structure of the liquid-vapor interface of the electrolyte solution, the impact of n-decanol molecules on the interfacial properties and the absorption dynamic process employing the method of molecular dynamics simulation. The liquid-vapor configuration of lithium bromide aqueous solution added with four concentration of n-decanol can be analyzed by examining the density profile, the radial distribution functions and orientational order parameter. The computed results revealed that n-decanol molecules tended to adsorb at the interface with the methyl group pointing into the vapor phase and hydrophilic hydroxyl group pointing into the liquid phase which do much help to form a hydrogen bond network with water, and the tendency of this kind of preferred orientation became distinct with the increase of the amount of n-decanol. The hydrocarbon chains of n-decanol molecules were inclined to close to stay upright near the interface while the monolayer of n-decanol came into being near the interface. Ions were repelled from the surface. The direct interactions between hydroxyl hydrogen of n-decanol and anion exist, and there are much stronger electrostatic interactions between oxygen of n-decanol and cation. The dynamic process of the absorption of water into aqueous electrolyte solution with or without n-decanol was explored by molecular dynamics simulation under non equilibrium conditions. The simulation results showed that in comparison to the lithium bromide aqueous solution without n-decanol, the electrolyte aqueous solution with n-decanol can absorb more water molecules distinctly for 100 ps.
Sponsorship	Heat Transfer Division
Starting Page	845
Ending Page	851
Page Count	7
File Format	PDF
ISBN	9780791849385
DOI	10.1115/IHTC14-22746
e-ISBN	9780791838792
Volume Number	2010 14th International Heat Transfer Conference, Volume 3
Conference Proceedings	2010 14th International Heat Transfer Conference
Language	English
Publisher Date	2010-08-08
Publisher Place	Washington, DC, USA
Access Restriction	Subscribed
Subject Keyword	Water Chain Oxygen Ethanol Hydrogen Equilibrium (physics) Vapors Lithium Electrostatic interactions Ions Molecular dynamics simulation Surfactants Density Absorption Simulation results Hydrogen bonds Electrolytes Water absorption
Content Type	Text
Resource Type	Article

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