Measuring and testing – Liquid analysis or analysis of the suspension of solids in a... – Viscosity
Patent
1983-10-18
1985-08-27
Levy, Stewart J.
Measuring and testing
Liquid analysis or analysis of the suspension of solids in a...
Viscosity
73 644, G01N 1116, G01N 1302
Patent
active
045370648
ABSTRACT:
Instrument for measuring the shear modulus of a monomolecular film comprises a circular trough having inwardly sloping sides containing a liquid for supporting the monolayer on the surface thereof; a circular rotor suspended above the trough such that the lower surface of the rotor contacts the surface of the liquid, positioned such that the axis of the rotor is concentric with the axis of the trough and freely rotable about its axis; apparatus for hydrostatically compressing the monolayer in the annular region formed between the rotor and the sides of the trough; and apparatus for rotating the trough about its axis. Preferably, hydrostatic compression of the monolayer is achieved by removing liquid from the bottom of the trough (decreasing the surface area) while raising the trough vertically along its axis to maintain the monolayer at a constant elevation (and maintain rotor contact). In order to measure viscosity, a apparatus for rotating the rotor about its axis is added to the apparatus.
REFERENCES:
patent: 4413506 (1983-11-01), Abraham et al.
Abraham et al., A Wide Range High Sensitivity Film Balance, in Rev. Sci. _Instr., vol. 51(8), pp. 1083-1087, Aug. 1980.
Sohl et al., Novel Technique for Dynamic Surface Tension and Viscosity _Measurements at Liquid-Gas Interfaces, in Rev. Sci. Instr., vol. 49(10), _pp. 1464-1469, Oct. 1978.
Abraham et al., Centro-Symmetric Technique for Measuring Shear Modulus, _Viscosity & Surface Tension of Spread Monolayers, in Rev. Sci. Instr., vol. _52(2), pp. 213-219, Feb. 1983.
Fromherz, Instrum. for Handling Monomolecular Films at Air-Water _Interface, in Rev. Sci. Instr., vol. 46(10), pp. 1380-1385, Oct. 1975.
Abraham Bernard M.
Ketterson John B.
Miyano Kenjiro
Hightower Judson R.
Levy Stewart J.
Rees Walter L.
Roskos Joseph W.
The United States of America as represented by the United States
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