Method and apparatus for measuring .zeta. potential of a substan

Details Method and apparatus for measuring .zeta. potential of a substan Method and apparatus for measuring .zeta. potential of a substan

1991-09-30

1994-01-18

Strecker, Gerard R.

Electricity: measuring and testing

A material property using electrostatic phenomenon

324438, 324453, G01N 2727, G01N 27416, G01N 2760

Patent

active

052802507

ABSTRACT:
The invention describes a novel device to measure .zeta.-potentials of substances at high temperatures. The device involves packing the substance to be measured into a "RULON" (polytetrafluoroethylene including a heat resistant filler, e.g., fiberglass, quartz, asbestos, ceramic fibers or mica) column and passing an electrolyte through the column. Measurements are taken across the column to measure streaming potential and the pressure drop, and a sensor in series with the column to measure the pH of the electrolyte. .zeta.-potentials are calculated from slopes of the plots of streaming potential (.DELTA.E) vs. differential pressure (.DELTA.P) using a computer controlled data acquisition system.

REFERENCES:
patent: 3306320 (1967-02-01), Bond
patent: 3368144 (1968-02-01), Gerdes
patent: 3502965 (1970-03-01), Gerdes et al.
patent: 5059909 (1991-10-01), O'Brien
Parks, G. A. Chem Rev. 65:117 (1965) "The Isoelectric Points of . . . and Aqueous Hydroxo Complex Systems", pp. 177-198.
Van Wagenen, R. A. et al. J. Coll. Interface Sci. 76:305 (1980), "Flat Plate Streaming Potential Investigations: Hydrodynamics and Electrokinetic Equivalency" pp. 305-314.

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