Ion selective electrode
First Claim
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1. An ion selective electrode comprising:
- a conductive electrode body having an essentially planar first surface A1 with an outer edge;
an insulating substrate supporting the electrode body and having an essentially planar first surface which surrounds and is essentially coplanar with the first surface of the electrode body; and
a convex dome-shaped ion selective membrane over the first surfaces of the electrode body and the insulating substrate;
the membrane covering an area A2 which is greater than the area of the first surface of the electrode body and the membrane having an outer edge which is spaced laterally from and which is essentially coplanar with the outer edge of the first surface of the electrode body.
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Abstract
An ion selective electrode includes a conductive electrode body which is supported by an insulating substrate. A convex dome-shaped membrane containing an electroactive species is deposited over and is directly in contact with the electrode body and a surface of the substrate surrounding the electrode body. The membrane has its greatest height above the electrode body and slopes down to meet the surface of the substrate. A moat formed in the insulating substrate surrounds the space from the electrode body to define the outer boundary of the dome-shaped member.
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Citations
22 Claims
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1. An ion selective electrode comprising:
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a conductive electrode body having an essentially planar first surface A1 with an outer edge; an insulating substrate supporting the electrode body and having an essentially planar first surface which surrounds and is essentially coplanar with the first surface of the electrode body; and a convex dome-shaped ion selective membrane over the first surfaces of the electrode body and the insulating substrate;
the membrane covering an area A2 which is greater than the area of the first surface of the electrode body and the membrane having an outer edge which is spaced laterally from and which is essentially coplanar with the outer edge of the first surface of the electrode body. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An ion selective electrode comprising:
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a conductive electrode body having an essentially planar first surface; an insulating substrate supporting the electrode body, the substrate having a first surface essentially coplanar with the first surface of the electrode body and having an annular moat depression surrounding and spaced from the electrode body; and a convex dome-shaped ion selective membrane deposited over and directly in contact with the electrode body and the first surface of the substrate located within an area defined by an inner edge of the moat depression, the membrane having an outer edge which is spaced from an outer edge of the electrode body and which is defined by the inner edge of the moat.
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17. A method of making an ion selective electrode comprising:
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mounting a conductive electrode body in an insulating substrate so that the electrode body and the insulating substrate define an essentially planar surface with a moat depression in the insulating surface which surrounds and has an inner edge which is spaced laterally from an outer edge of the electrode body; and depositing over the essentially planar surface a mixture of a polymer dispersed in plasticizer with an electroactive species dispersed therein to form a convex dome-shaped membrane over the essentially planar surface defined by the electrode body and a portion of the insulating substrate surrounding the electrode body, the membrane having an outer edge defined by the inner edge of the moat depression. - View Dependent Claims (18)
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19. An ion selective electrode comprising:
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a conductive electrode having an essentially planar first surface with an area A1; an insulating substrate supporting the electrode body and having an essentially planar first surface which surrounds and is essentially coplanar with the first surface of the electrode body; and a convex dome-shaped ion selective membrane over the first surfaces of the electrode body and the insulating substrate;
the membrane having a maximum thickness at a position over the first surface of the electrode body which is between about 0.5 mm and about 0.9 mm; and
the membrane covering an area A2 which is greater than area A1 of the first surface of the electrode body and having an outer edge which is generally concentrically spaced from and coplanar with an outer edge of the first surface of the electrode body, wherein A1/A2 is between about 0.01 and about 0.25. - View Dependent Claims (20)
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21. An ion selective electrode comprising:
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a conductive electrode body having an essentially planar surface; an insulating substrate supporting the electrode body, the substrate having a surface essentially coplanar with and surrounding the planar surface of the electrode body and having an annular moat depression generally concentrically positioned to surround the electrode body with an inner edge of the moat depression spaced from an outer edge of the electrode body; and a convex dome ion selective membrane deposited over and directly in contact with the electrode body and a surface of the substrate within the moat.
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22. A method of making an ion selective electrode comprising:
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mounting a conductive electrode body in an insulating substrate so that the electrode body and the insulating substrate form an essentially planar exposed surface surrounded generally concentrically by a moat depression; and depositing over the planar exposed surface a mixture of a polymer dispersed in plasticizer with an electroactive species dispersed therein to form, as a result of surface tension, a convex dome-shaped membrane over the electrode body and the portion of the insulating substrate surrounding the electrode body, the membrane having an outer edge defined by an inner edge of the moat depression.
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Specification