Apparatus and methods for determining liquid/liquid interfacial tension and dynamic interfacial tension reduction

摘要

Apparatus and methods for determining the liquid/liquid interfacial tension between immiscible liquids wherein a first liquid is introduced into a second liquid at a constant rate of flow sufficient to produce successive, uniform size drops which ascend or descend depending upon whether the first liquid has a lower or higher density than that of the second liquid. The apparatus and methods are particularly useful in evaluating the effectiveness of a surfactant and the dynamics of interfacial reduction. In practice, the first liquid is discharged into the second liquid through a nozzle having an outlet of very low surface area. The time required to produce a selected number of drops is inversely proportional to the ability of the surfactant to reduce interfacial tension between the two liquids.