Precision spinning drop interfacial tensiometer

Details Precision spinning drop interfacial tensiometer Precision spinning drop interfacial tensiometer

1979-04-30

1981-02-17

Goldberg, Gerald

Measuring and testing

Liquid analysis or analysis of the suspension of solids in a...

Vapor pressure

G01N 1302

Patent

active

042507413

ABSTRACT:
An improved instrument for the precise measurement of interfacial tension between two fluid phases by means of a drop of the less dense fluid surrounded by the more dense fluid, both fluids spinning together in gyrostatic equilibrium. Elements of the invention eliminate departures from gyrostatic equilibrium which went unrecognized in the prior art. These elements are based on hydrodynamic principles unknown in the prior art. The instrument is characterized by the combined use of air bearings and sample-holder mountings which reduce vibrations and eccentricities, eliminate temperature gradients within the sample, and assure that interfering hydrodynamic flows are suppressed. Other improvements include biprecision sample tube, full visual access to the spinning drop, leveling provisions, timing belt transmission, avoidance of bearing heating and wear problems, and convenient control of sample temperature.

REFERENCES:
Torza, S. The Rotating-bubble Apparatus, in Rev. Sci. Instr. 46(6): p. 778-783. Jun. 1975.

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