ABSTRACT
Consequently, it must be concluded that the surfactant studied impede water evaporation only at a sufficiently high rate of evaporation, when K values are higher than 10−3 cm2/s.
For further experiments, cetyl alcohol (CA), a surfactant insoluble in water whose adsorption on water surface significantly decreases the coefficient of condensation [14], was used. However, the problem arose of how to apply the surfactant on the meniscus surface in a narrow capillary. First, CA was adsorbed onto the inner capillary surface from its solution in ethanol. The capillary was filled with 0.5−1 % solution, which was then displaced, retaining on the capillary surface a thin wetting film. After that the capillary was dried, filled with water, and sealed. Observation of evaporation was initiated after the capillary was broken inside the region filled with water, so that at the beginning there was no CA on the meniscus.
