Abstract
An experimental device and procedure are described for the fully automatic determination of the surface tension of liquids and (particularly) surfactant solutions. The computer-controlled system is capable of yielding precise and reproducible values of that quantity. The possibilities of equilibration times selected by the user, cleaning the surface by suction, and adding fresh solution prior to each measurement are emphasised among other capabilities. As an example, a solution of sodium dodecylsulphate (10-3 mol dm-3) plus sodium chloride (10-2 mol dm-3) is extensively studied.
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