Material for establishing solid state contact for ion selective electrodes
First Claim
1. A ion selective sensor comprising:
- an electrically conductive material providing a reference redox couple, said electrically conductive material including mobile ions having a first charge;
and acrylic polymeric material having immobilized charge sites, said immobilized charge sites having a second charge opposite said first charge, said acrylic polymeric material swelling to a weight of not more than 5 times its dry weight when contacted with water, said acrylic polymeric material being provided on said electrically conductive material;
an ion selective material covering said acrylic polymeric material, wherein said electrically conductive material and said ion selective material are not in direct physical contact; and
said acrylic polymeric material including less than 1.63×
1021 immobilized charge sites per gram,wherein said acrylic polymeric material comprises the copolymerization product of at least one charged monomer and at least one member selected from the group consisting of neutral monomers and polymers,wherein said acrylic polymeric material comprises the copolymerization product of at least one charged acrylic monomer and at least one neutral acrylic monomer,wherein said at least one charged acrylic monomer has the formula;
##STR3## where R1 is selected from the group consisting of hydrogen, hydrocarbons groups, and alcohol groups, and Y has the formula;
##STR4## where R2 is selected from the group consisting of straight saturated hydrocarbon chains, branched saturated hydrocarbon chains, straight unsaturated hydrocarbon chains, branched unsaturated hydrocarbon chains, straight saturated hydrocarbon chains having hydroxy functionalities, branched saturated hydrocarbon chains having hydroxy functionalities, straight unsaturated hydrocarbon chains having hydroxy functionalities and branched unsaturated hydrocarbons having hydroxy functionalities, R3, R4, and R5 are each selected from the group consisting of hydrogen, hydrocarbon groups, and alcohol groups, and can be the same or different, and Z- is selected from the group consisting of halides, acetate, and methylsulfate ion,wherein R1 is selected from the group consisting of H and CH3,R2 is selected from the group consisting of straight and branched saturated hydrocarbon chains,R3, R4, and R5 are each selected from the group consisting of H and CH3 and can be the same or different, andZ is a halide,wherein R3, R4, and R5 each compromise CH3, andZ is a chloride,wherein said at least one charged acrylic monomer comprises methacrylamidopropyltrimethylammoniumchloride.
3 Assignments
0 Petitions
Accused Products
Abstract
A polymeric material which to form a stable, reproducible interface between the ionic and electronic domains of an ion selective sensor, or an ion selective field effect transistor, or the like is provided. When employed in an ion selective sensor, the polymeric material is advantageously provided over a solid internal reference electrode and an ion selective material is provided thereover. According to one embodiment, the polymeric material of the invention includes less than about 1.63×1021 immobilized charged sites per gram (less than about 2.72 millaequivalents/gram). According to another embodiment, the polymeric material includes immobilized sites of charge opposite that of mobile ions involved in the redox couple. A preferred polymeric material comprises a copolymer of methacrylamidopropyltrimethylammoniumchloride and methylmethacrylate.
-
Citations
12 Claims
-
1. A ion selective sensor comprising:
-
an electrically conductive material providing a reference redox couple, said electrically conductive material including mobile ions having a first charge; and acrylic polymeric material having immobilized charge sites, said immobilized charge sites having a second charge opposite said first charge, said acrylic polymeric material swelling to a weight of not more than 5 times its dry weight when contacted with water, said acrylic polymeric material being provided on said electrically conductive material; an ion selective material covering said acrylic polymeric material, wherein said electrically conductive material and said ion selective material are not in direct physical contact; and said acrylic polymeric material including less than 1.63×
1021 immobilized charge sites per gram,wherein said acrylic polymeric material comprises the copolymerization product of at least one charged monomer and at least one member selected from the group consisting of neutral monomers and polymers, wherein said acrylic polymeric material comprises the copolymerization product of at least one charged acrylic monomer and at least one neutral acrylic monomer, wherein said at least one charged acrylic monomer has the formula;
##STR3## where R1 is selected from the group consisting of hydrogen, hydrocarbons groups, and alcohol groups, and Y has the formula;
##STR4## where R2 is selected from the group consisting of straight saturated hydrocarbon chains, branched saturated hydrocarbon chains, straight unsaturated hydrocarbon chains, branched unsaturated hydrocarbon chains, straight saturated hydrocarbon chains having hydroxy functionalities, branched saturated hydrocarbon chains having hydroxy functionalities, straight unsaturated hydrocarbon chains having hydroxy functionalities and branched unsaturated hydrocarbons having hydroxy functionalities, R3, R4, and R5 are each selected from the group consisting of hydrogen, hydrocarbon groups, and alcohol groups, and can be the same or different, and Z- is selected from the group consisting of halides, acetate, and methylsulfate ion,wherein R1 is selected from the group consisting of H and CH3, R2 is selected from the group consisting of straight and branched saturated hydrocarbon chains, R3, R4, and R5 are each selected from the group consisting of H and CH3 and can be the same or different, and Z is a halide, wherein R3, R4, and R5 each compromise CH3, and Z is a chloride, wherein said at least one charged acrylic monomer comprises methacrylamidopropyltrimethylammoniumchloride.
-
-
2. A chemical responsive field effect transducer comprising:
-
a layer of semiconductor material having a surface; a pair of first diffusion regions of a first doping characteristic at said surface, a region of said surface of said layer of semiconductor material existing between said pair of first diffusion regions; a second diffusion region of a second doping characteristic at said surface between said pair of first diffusion regions; an electrically insulating material provided on said region of said surface of said layer of semiconductor material existing between said pair of first diffusion regions; an acrylic polymeric material having immobilized charged sites provided on said electrically insulating material, said acrylic polymeric material carrying less than about 1.63×
1021 immobilized charged sites per gram, said acrylic polymeric material swelling to a weight not more than 5 times its dry weight when contacted with water, said acrylic polymeric material separated from said diffusion regions by said insulating material;an ion selective material provided on said acrylic polymeric material; and an electrically insulating encapsulant sealing said transducer from a sample region while leaving exposed a region of said ion selective material for exposure to a sample, wherein said acrylic polymeric material is not in direct physical contact with said sample, and wherein said ion selective material is not in direct physical contact with said insulating material. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. An ion selective sensor, comprising:
-
an electrically conductive material providing a reference redox couple, said electrically conductive material including mobile ions having a first charge; an acrylic polymeric material having immobilized charge sites, said immobilized charge sites having a second charge opposite said first charge, said acrylic polymeric material swelling to a weight of not more than 5 times its dry weight when contacted with water, said acrylic polymeric material being provided on said electrically conductive material; an ion selective material covering said acrylic polymeric material, wherein said electrically conductive material and said ion selective material are not in direct physical contact; and said acrylic polymeric material including less than 1.63×
1021 immobilized charge sites per gram,wherein said acrylic polymeric material comprises the copolymerization product of methacrylamidopropyltrimethylammoniumchloride and at least neutral acrylic monomer.
-
Specification