Apparatus and methods for determining liquid/liquid interfacial

Measuring and testing – Liquid analysis or analysis of the suspension of solids in a... – Surface tension

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G01N 1302

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052188418

ABSTRACT:
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.

REFERENCES:
patent: 3913385 (1975-10-01), Jobe
patent: 4196615 (1980-04-01), Davis
patent: 4391129 (1983-07-01), Trinh et al.
patent: 4697451 (1987-10-01), Matteson
IBM Technical Bulletin vol. 22 No. 5 (Oct. 1979) pp. 2082-2083 Titcomb, S. C. "Instrument for Measuring Dynamic Surface Tension".
Journal of Colloid and Interface Science vol. 60 No. 1 (Jun. 1, 1977) pp. 50-53 Tornberg, Eva "A Surface Tension Apparatus According to the Drop Volume Principle".
Brochure by Lauda regarding Tropfenvolumen-Tensiometer TVT 1 (Translation of Three Paragraphs marked by an Asterisk) (May 1988).
Brochure by Brinkmann, regarding Lauda Tensiometers for Science Quality Surface Measurements (Aug. 1987).

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