Neue Methoden zur Messung der Wasserdampfdurchlässigkeit dünner Filme auf Wasser und auf lebender Haut

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Abstract
The method for the determination of the permeability to water vapor of mono- and polymolecular films on water surfaces depends on the use of 2 thermocouples, one being rituated over a water surface covered with the film, the other over a film-free water surface. The water vapor which condenses on the thermocouples produces changes in temperature from which the amount of water diffusing through the film can be estimated. It is thus possible to record simultaneously permeability to water vapor, the F/A isotherm and the surface potential. There is an inverse linear relationship between surface tension and permeability to water vapor. The method for the measurement of the permeability to water vapor of films of fatty substances on skin employs a hood covering an area of about 50 cm2 of skin, through which a stream of dry air is passed. The amount of water taken up by the stream of air is measured after condensation in a solid CO2 trap.

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