Evaporation of liquids and solutions in confined geometry.
We describe a drying setup where a liquid droplet is confined between two circular glass plates and allowed to evaporate. Optical imaging of the shrinking droplet provides the temporal evolution of the solvent volume. For a pure liquid, we measure the diffusion coefficient of the evaporating gas with a good accuracy. For a solution, the slowing down of evaporation by progessive concentration of the solute yields a direct measurement of the solvent activity.
School of Physics, The University of Edinburgh, Mayfield Road, Edinburgh EH9 3JZ, Scotland.
F
F
Clément
J
J
Leng