Hydrogen bond lifetime dynamics at the interface of a surfactant monolayer

Article Abstract:

An atomistic molecular dynamics (MD) simulation to exhaustively investigate the lifetime dynamics of surfactant-water (SW) and water-water (WW) hydrogen bonds at the interface of a monolayer of the anionic surfactant sodium bis (2-ethyl-1-hexyl) sulfosuccinate (aerosol- OT- or AOT) adsorbed at the air/water interface, at room temperature, with a surface coverage of that at the crucial micelle concentration is performed. It is inferred that the relaxation of the SW hydrogen bonds is quicker for those water molecules which form two hydrogen bonds with the surfactant headgroups than those forming one hydrogen bond.

Water, Molecular dynamics, Hydrogen bonding, Hydrogen bonds, Structure

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Study of the surface thermal coefficient, bTP: evidence of phase transition at low surfactant concentrations. Example of solutions of Triton X100 in water and in water-ethylammonium nitrate media

Article Abstract:

It is observed that the thermal coefficient described by Defay seemed to be a useful tool for showing whether surface transitions occur in soluble surfactants. Classical thermodynamic relationships link this thermal coefficient to the isotherm adsorption of the surfactant at the liquid-vapor interface.

Nitrates, Chemistry, Physical and theoretical, Physical chemistry, Atmospheric temperature

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