Gas sensor
First Claim
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1. A gas sensing composition which comprises:
- suspended dispersed microcompartments of an aqueous first phase in a cross-linked polymeric second phase wherein said aqueous first phase is present in micro-compartments smaller that 5 microns, said first phase comprising an aqueous buffer solvent and a solute, said solute including a dye soluble in said solvent, and said second cross-linked polymeric phase comprising a gas permeable, light permeable, ion impermeable and substantially aqueous impermeable polymeric material.
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Abstract
A gas sensor has a first aqueous phase. The aqueous phase is composed of a soluble dye in a buffer. One or more additional agent can be further added to the aqueous phase as for instance an emulisification enhancement agent. The aqueous phase is homogenized into a polymeric precursor forming a emulsion of the aqueous phase in the polymeric precursor. A catalyst and a cross-linking agent are added and the polymeric precursor material allowed to polymerize to form an emulsoid of micro-compartments of the aqueous phase in a polymeric second phase. The micro-compartments of the aqueous phase are dispersed through and permanently suspended in the polymeric second phase.
194 Citations
26 Claims
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1. A gas sensing composition which comprises:
suspended dispersed microcompartments of an aqueous first phase in a cross-linked polymeric second phase wherein said aqueous first phase is present in micro-compartments smaller that 5 microns, said first phase comprising an aqueous buffer solvent and a solute, said solute including a dye soluble in said solvent, and said second cross-linked polymeric phase comprising a gas permeable, light permeable, ion impermeable and substantially aqueous impermeable polymeric material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 24)
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16. A carbon dioxide gas sensing composition which comprises:
a quantity of a first phase dispersed in a quantity of a second phase as a plurality of isolates smaller than 5 microns, said first phase comprising a quantity of hydroxypyrene trisulfonic acid in an aqueous buffer solution and said second phase comprises a quantity of a gas permeable, light permeable ion impermeable and substantially aqueous impermeable polymeric material. - View Dependent Claims (17)
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18. A gas sensor which comprises:
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an aqueous phase having an aqueous soluble optical indicator dye dissolved therein; a gas permeable carrier body which is essentially aqueous impermeable and ion impermeable and is capable of transmitting light at least at selected wavelengths; a plurality of droplets of said aqueous phase dispersed in said carrier body, said droplets being supported by said carrier body; an optical fiber having an optical face; and said carrier body with said aqueous phase dispersed therein being located in association with said optical face of said optical fiber. - View Dependent Claims (19, 20)
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21. A gas sensing composition comprising:
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a gas permeable, light permeable ion impermeable and substantially aqueous impermeable matrix consisting essentially of a single polymeric material, said matrix having a plurality of micro-compartments dispersed therein; and an aqueous phase in said micro-compartments and substantially filling said micro-compartments, said aqueous phase comprising an aqueous buffer solvent and a solute, said solute including a dye soluble in said solvent.
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22. A gas sensor comprising:
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a gas sensing composition which comprises suspended dispersed micro-compartments of an aqueous first phase in a cross-linked polymeric second phase wherein said aqueous first phase is present in micro-compartments smaller than 5 microns, said first phase comprising an aqueous buffer solvent and a solute, said solute including a dye soluble in said solvent, and said second cross-linked polymeric phase comprising a gas permeable, light permeable, ion impermeable and substantially aqueous impermeable polymeric material; and optical fiber means on which said gas sensing composition is located for transmitting signals from said gas sensing composition. - View Dependent Claims (23)
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25. A carbon dioxide gas sensor comprising:
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a carbon dioxide gas sensing composition which comprises a quantity of a first phase dispersed in a quantity of second phase as a plurality of isolates smaller than 5 microns, said first phase comprising a quantity of hydroxypyrene trisulfonic acid in an aqueous buffer solution and said second phase comprises a quantity of gas permeable, light permeable, ion impermeable and substantially aqueous impermeable polymeric material and; optical fiber means on which said carbon dioxide gas sensing composition is located for transmitting signals from said carbon dioxide gas sensing composition.
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26. A gas sensor comprising:
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a gas permeable, light permeable, substantially aqueous impermeable and ion impermeable matrix consisting essentially of a single polymeric material, said matrix having a plurality of micro-compartments dispersed therein; and an aqueous phase in said micro-compartments and substantially filling said micro-compartments, said aqueous phase comprising an aqueous buffer solvent and a solute, said solute including a dye soluble in said solvent; and optical fiber means on which said matrix is located for transmitting signals from said dye.
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Specification