A New Isothermal DTA Method for the Study of Surfactants at Liquid Surfaces
A new isothermal DTA method for the detection and study of surfactants at the liquid/vapour interface is presented, In this method a certain mass of liquid is slightly superheated above its boiling point in two identical vessels by a constant heat input. If now a surfactant is added to one of the vessels, it more or less strongly retards the evaporative mass (and thus heat) flux from the corresponding surface and this liquid warms up with respect to the reference liquid. The time-dependent temperature difference can be used to obtain information about amount and nature of the surfactant, its adsorption isotherm, the area per molecule in the monolayer etc,
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