Local modes and the surface-bulk exchange rate at a liquid interface

Article Abstract:

The small-scale motions of a liquid surface due to thermally excited capillary waves are dominated by overdamped local modes of oscillations, for which a water surface at 300K occupy the range of wave vectors between the critically damped k(sub c) = 1709cm(super -1) and k(sub max) ~10(super -8) cm(super -1). Results show that values of k below k(sub c) correspond to under-damped, normal modes of oscillation, the time dependence of local mode consists of rapid initial displacement of the surface followed by a very slow recovery.

Water chemistry

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Onsager heat of transport measured at the n-heptanol liquid-vapor interface

Article Abstract:

The Onsager heat of transport Q* is determined by measuring the temperature gradient at the interface on the apparent vapor pressure of the liquid. Results are discussed in relation to three anomalous effects that are predicted or observed during steady-state evaporation and in relation to the problem of determining rates of air-sea exchange for atmospheric gases.

Evaporation, Atmospheric gases

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A molecular-scale model for the coupling of heat and matter fluxes at a gas-liquid interface

Article Abstract:

The liquid surface is sharply defined at any instant bur is highly mobile with a surface roughness that increases markedly when the scale of observation is reduced to molecular dimensions, is a current view of the gas-liquid interface. It is implied by the results that evaporating molecules must surmount a free-energy barrier rather than an enthalpy barrier.

Observations, Molecular dynamics, Surface chemistry

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