Method of making a material for establishing solid state contact for ion selective electrodes
First Claim
1. A method of providing a stable and reproducible electrical interface between a solid contact reference providing a redox couple formed of a conductive metal and a salt of the metal, the salt of the metal including first and second ions, the first ions being ions of the metal having a first charge and the second ions having a second charge opposite the first charge, and a cation-selective material of an ion selective sensor or the like, comprising the step of:
- contacting both said solid contact reference and said cation-selective material with a polymeric material comprising a polymerization product of at least one charged monomer and including immobilized, positively charged sites from said charged monomer and mobile counter ions that are the same ions as the second ions, thereby providing a stable equilibrium and enhanced ionic transport between the redox couple and the polymeric material.
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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 1.63×10<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.
14 Citations
15 Claims
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1. A method of providing a stable and reproducible electrical interface between a solid contact reference providing a redox couple formed of a conductive metal and a salt of the metal, the salt of the metal including first and second ions, the first ions being ions of the metal having a first charge and the second ions having a second charge opposite the first charge, and a cation-selective material of an ion selective sensor or the like, comprising the step of:
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contacting both said solid contact reference and said cation-selective material with a polymeric material comprising a polymerization product of at least one charged monomer and including immobilized, positively charged sites from said charged monomer and mobile counter ions that are the same ions as the second ions, thereby providing a stable equilibrium and enhanced ionic transport between the redox couple and the polymeric material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of forming an ion selective sensor comprising the steps of:
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providing an electrically conductive material;
creating a redox couple formed of a conductive metal and a salt of the metal, the salt of the metal including first and second ions, the first ions being ions of the metal having a first charge and the second ions having a second charge opposite the first charge including a portion of said electrically conductive material;
coating said redox couple with a polymeric material comprising a polymerization product of at least one charged monomer and including immobilized, positively charged sites from said charged monomer and mobile counter ions that are the same ions as the second ions; and
covering said polymeric material with a cation-selective material, thereby providing a stable equilibrium and enhanced ionic transport between the redox couple and the polymeric material. - View Dependent Claims (14, 15)
(A) a compound having the formula CH2=C(R1) (COOR2), where R1 and R2 are each selected from the group consisting of hydrogen, hydrocarbons, and alcohols, and can be the same or different; and
(B) a species having the formula;
where R1 is selected from the group consisting of hydrogen, hydrocarbons groups, and alcohol groups, and Y has the formula;
where R2 is selected from the group consisting of straight or branched saturated hydrocarbon chains, straight or branched unsaturated hydrocarbon chains and straight or branched saturated or unsaturated hydrocarbon chains 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, onto said salt layer so as to completely cover said layer with said mixture; and
drying said mixture in said organic solvent.
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15. The method as recited in claim 13, comprising the further steps of:
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selecting an electrically non-conductive substrate; and
depositing said electrically conductive material onto a portion of said substrate.
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Specification