Reference electrode with a polymeric reference electrode membrane
First Claim
1. A reference electrode comprising:
- a polymeric reference electrode membrane comprising (a) one selected from a cellulose based porous polymer and a hydrophilic plasticizer and (b) a lipophilic polymer, wherein the hydrophilic plasticizer is selected from the group consisting of glycerol, polyethylene glycol, ethylene glycol monomethyl ether, ethylene glycol, formamide and a combination thereof;
an inner reference electrode 3 positioned at the center within the reference electrode; and
an inner reference electrolyte 7 filling the internal space of the reference electrode;
wherein the polymeric reference electrode membrane 8 is mounted to an end of the electrode, wherein the inner reference electrolyte 7 is a hydrogel obtained by dissolving 1-15% by weight of a hydrophilic polymer in 0.01-3.0 M aqueous solution saturated with a salt selected from the group consisting of KCl, NaCl, KNO3 and NH4NO3, each of which is similar in mobility.
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Abstract
Disclosed is a polymeric reference electrode membrane comprising (a) one selected from a porous polymer or a hydrophilic plasticizer; (b) a lipophilic polymer; and optionally an adhesion-enhancing material. A reference electrode equipped with the polymeric reference electrode membrane can be shortened the preconditioning time, and extended lifetime for storage and use owing to excellent adhesion, and showed reproducibility and good yield. So, a miniaturized multi-potentiometric sensor can be fabricated comprising a solid-state reference electrode of the present invention and a set of ion-selective electrodes, thus being useful in the potentiometric fields, including clinical, environmental, food and industrial analysis.
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Citations
25 Claims
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1. A reference electrode comprising:
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a polymeric reference electrode membrane comprising (a) one selected from a cellulose based porous polymer and a hydrophilic plasticizer and (b) a lipophilic polymer, wherein the hydrophilic plasticizer is selected from the group consisting of glycerol, polyethylene glycol, ethylene glycol monomethyl ether, ethylene glycol, formamide and a combination thereof;
an inner reference electrode 3 positioned at the center within the reference electrode; and
an inner reference electrolyte 7 filling the internal space of the reference electrode;
wherein the polymeric reference electrode membrane 8 is mounted to an end of the electrode, wherein the inner reference electrolyte 7 is a hydrogel obtained by dissolving 1-15% by weight of a hydrophilic polymer in 0.01-3.0 M aqueous solution saturated with a salt selected from the group consisting of KCl, NaCl, KNO3 and NH4NO3, each of which is similar in mobility. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 18)
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11. A solid-state reference electrode comprising:
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a) a substrate 10;
b) an insulating film layer 9 formed on the substrate;
c) a reference electrode material 11 insulated by the insulating film layer 9; and
d) a polymeric reference electrode membrane 8 protecting the reference electrode material 11, wherein the polymeric reference electrode membrane comprises (a) one selected from a cellulose based porous polymer and a hydrophilic plasticizer and (b) a lipophilic polymer, the hydrophilic plasticizer being selected from the group consisting of glycerol, polyethylene glycol, ethylene glycol monomethyl ether, ethylene glycol, formamide and a combination thereof, wherein the polymeric reference electrode membrane 8 is additionally fixed to a hydrogel layer 12, thereby the reference electrode material 11 is protected by the polymeric reference electrode membrane and the hydrogel layer and is made of silver/silver chloride 19. - View Dependent Claims (12, 13, 14, 15, 16, 17, 19, 20, 21, 22, 23, 24, 25)
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Specification