Techniques for sensing chloride ions in wet or dry media
First Claim
1. A sensor for measuring chloride ion concentration in a medium, comprising:
- a pair of electrodes; and
a polymer film imprinted for uptake of chloride ions under alkaline conditions, wherein the film is disposed on an electrode of the pair of electrodes for contact with the medium.
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Abstract
Techniques are provided for measuring chloride ion concentration in a medium. The techniques allow measurements to be made in dry or alkaline media, or both. For alkaline conditions, a sensor includes a pair of electrodes and a polymer film imprinted for uptake of chloride ions under alkaline conditions. The film is deposited to be in contact with at least one electrode and the medium. For dry conditions, a sensor includes a pair of electrodes and a conductive polymer film imprinted for uptake of chloride ions. The film is in contact with the pair of electrodes, and is positioned for contact with the medium. An electrical conductivity of the film depends on an amount of chloride ions taken up by the film. Some techniques allow chloride ion measurements over years at sensors embedded in concrete. Such measurements allow the determination of the progress of rebar corrosion in concrete infrastructure.
28 Citations
31 Claims
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1. A sensor for measuring chloride ion concentration in a medium, comprising:
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a pair of electrodes; and
a polymer film imprinted for uptake of chloride ions under alkaline conditions, wherein the film is disposed on an electrode of the pair of electrodes for contact with the medium. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A sensor for measuring chloride ion concentration in a medium, comprising:
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a pair of electrodes; and
a conductive polymer film imprinted for uptake of chloride ions, wherein the film is disposed in contact with the pair of electrodes, the film is disposed for contact with the medium, and an electrical conductivity of the film depends on an amount of chloride ions taken up by the film. - View Dependent Claims (14, 15, 16)
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17. A sensor for measuring chloride ion concentration in a medium, comprising:
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a pair of electrodes; and
a conductive polymer film imprinted for uptake of chloride ions under alkaline conditions, wherein the film is disposed in contact with the pair of electrodes, the film is disposed for contact with the medium, and an electrical conductivity of the film depends on an amount of chloride ions taken up by the film. - View Dependent Claims (18, 19, 20)
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21. An apparatus for long term monitoring of chloride ion concentration in a medium, comprising:
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a sensor platform for embedding in a medium;
a transmitter disposed on the sensor platform for transmitting to an interrogation unit a response signal based on a chloride measurement; and
a chloride sensor disposed on the sensor platform, which chloride sensor generates the chloride measurement, said chloride sensor comprising a pair of electrodes, and a conductive polymer film imprinted for uptake of chloride ions under alkaline conditions, wherein the film is disposed in contact with the pair of electrodes, the film is disposed for contact with the medium, and an electrical conductivity of the film depends on an amount of chloride ions taken up by the film. - View Dependent Claims (22, 23, 24)
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25. A method for fabricating a sensor for measuring chloride ion concentration in a medium, the method comprising the steps of:
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depositing an electrode on a substrate;
after said step of depositing the electrode, placing the substrate in an electrolyte solution of lithium chloride and methylpyrrole;
after said step of placing the substrate in the electrolyte solution, applying cyclic voltammetry to form a polymer film in contact with the electrode. - View Dependent Claims (26, 27, 28, 29, 30)
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31. A method for fabricating a sensor for measuring chloride ion concentration in a medium, the method comprising the steps of:
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depositing a pair of electrodes on a substrate;
treating the substrate with a silanizing agent to enhance adherence of pyrrole to the substrate between the pair of electrodes;
after said step of treating the substrate with a silanizing agent, placing the substrate in an electrolyte solution of lithium chloride and pyrrole;
after said step of placing the substrate in the electrolyte solution, applying cyclic voltammetry to form a polymer film in contact with the pair of electrodes.
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Specification