Capacitive chemical sensor using an ion exchange surface

Details Capacitive chemical sensor using an ion exchange surface Capacitive chemical sensor using an ion exchange surface

1989-06-19

1990-06-19

Marcus, Michael S.

Chemical apparatus and process disinfecting, deodorizing, preser

Analyzer, structured indicator, or manipulative laboratory...

Means for analyzing liquid or solid sample

422 69, 422 90, 422 98, 435817, 436806, 436150, G01N 2722

Patent

active

049352075

ABSTRACT:
A capacitive chemical sensor is disclosed that uses an ion exchange layer to detect analyte ions in a liquid medium. An exchange mechanism occurs on the surface of the ion exchange layer, wherein a portion of the counter-ions are removed from the surface in favor of analyte ions. The resulting movement of counter-ions from the surface of the ion exchange layer alters the dielectric constant of the liquid medium along the surface of the ion exchange layer. This change in dielectric constant produces a change in capacitance of the capacitive chemical sensor.

REFERENCES:
patent: 4343688 (1982-08-01), Harwood
patent: 4386336 (1983-05-01), Kinomoto
patent: 4520341 (1985-05-01), Miyoshi
patent: 4562725 (1986-01-01), Oka et al.
patent: 4571543 (1986-02-01), Raymond et al.

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