Molecular dynamics study of the liquid-vapor interface of lithium bromide aqueous solutions |
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Authors: | H Daiguji E Hihara |
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Institution: | (1) Department of Mechanical Engineering The University of Tokyo 7-3-1 Hongo Bunkyo-ku, Tokyo 113-8656, Japan, JP |
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Abstract: | The molecular dynamics simulations of the liquid–vapor interface of LiBr aqueous solutions were carried out to investigate
the structural and thermophysical properties. As concerns the structural properties, the results of molecular dynamics simulation
show that the ions exist in the liquid apart from the surface and this tendency becomes strong as the solute concentration
is lowered. This phenomenon is due to the desorption of ion. The calculated values such as density or surface tension agree
with experimental ones. As concerns thermophysical properties, the number of water molecules in the bulk gas decreases with
an increase of the solute concentration. This result represents the depression of vapor pressure. In addition, in order to
investigate the dynamic process of water vapor absorption into LiBr aqueous solution, the molecular dynamics simulation under
non-equilibrium condition was carried out. The results show that when the solute concentration is low and the temperature
is also low, almost all incident water molecules become trapped at the solution surface and then easily diffuse into the bulk
liquid, and when the solute concentration is high and temperature is also high, most incident water molecules become trapped
at the solution surface, and the sequent processes are very complicated.
Received on 28 September 1998 |
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