Oxygen sensing membranes and methods of making same
First Claim
1. A method of forming a polymeric sensing membrane having a Stern-Volmer constant kSV in the range of about 0.002 (mmHG)-1 to 1.0 (mmHg)-1, said method comprising the steps of:
- using a first selecting step selected from the group consisting ofa) selecting a fluorescent dye molecule having a relaxation time τ
O, said fluorescent dye molecule capable of emitting fluorescence, wherein oxygen to be sensed by said polymeric sensing membrane is capable of collisionally quenching said fluorescence of said fluorescent dye molecule;
orb) selecting a polymer having a permeability (PermO2);
using a second selecting step selected from the group consisting ofc) selecting a polymer having a permeability (PermO2) wherein said PermO2 required to provide said Stern-Volmer constant kSV is determined by the mathematical function log (kSv /τ
O)=log (4π
·
NA ·
p)+log (PermO2), or by the function log (kSV /τ
O)=2.05604+0.66877 log (PermO2), wherein said first selecting step is step a);
ord) selecting a fluorescent dve molecule having a relaxation time τ
O, wherein said relaxation time τ
O is determined by the mathematical function log (kSV /τ
O)=log (4π
·
NA ·
p)+log (PermO2), or by the function log (kSV /τ
O)=2.05604+0.66877 log (PermO2), said fluorescent dye molecule capable of emitting fluorescence, wherein oxygen to be sensed by said polymeric sensing membrane is capable of collisionally quenching said fluorescence of said fluorescent dye molecule, and wherein said first selecting step is step b);
admixing said fluorescent dye molecule with said polymer to form a mixture; and
forming said mixture into said polymeric sensing membrane.
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Abstract
A polymeric sensing membrane having a Stern-Volmer constant within a pre-determined range of Stern-Volmer constants. The membrane includes a polymeric material having a fluorescent dye molecule dispersed therein. The dye molecule is capable of having its fluorescence collisionally quenched by a gas to be detected by the membrane. In one embodiment, the membrane includes a fluorescent dye molecule which has a relaxation time and a polymeric material having a permeability within a range of permeabilities defined by a mathematical function of the pre-determined range of Stern-Volmer constants. In another embodiment, the membrane includes a polymeric having a permeability and a fluorescent dye molecule having a relaxation time within a range of relaxation times defined by a mathematical function of the pre-determined range of Stern-Volmer constants.
119 Citations
20 Claims
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1. A method of forming a polymeric sensing membrane having a Stern-Volmer constant kSV in the range of about 0.002 (mmHG)-1 to 1.0 (mmHg)-1, said method comprising the steps of:
-
using a first selecting step selected from the group consisting of a) selecting a fluorescent dye molecule having a relaxation time τ
O, said fluorescent dye molecule capable of emitting fluorescence, wherein oxygen to be sensed by said polymeric sensing membrane is capable of collisionally quenching said fluorescence of said fluorescent dye molecule;
orb) selecting a polymer having a permeability (PermO2);
using a second selecting step selected from the group consisting ofc) selecting a polymer having a permeability (PermO2) wherein said PermO2 required to provide said Stern-Volmer constant kSV is determined by the mathematical function log (kSv /τ
O)=log (4π
·
NA ·
p)+log (PermO2), or by the function log (kSV /τ
O)=2.05604+0.66877 log (PermO2), wherein said first selecting step is step a);
ord) selecting a fluorescent dve molecule having a relaxation time τ
O, wherein said relaxation time τ
O is determined by the mathematical function log (kSV /τ
O)=log (4π
·
NA ·
p)+log (PermO2), or by the function log (kSV /τ
O)=2.05604+0.66877 log (PermO2), said fluorescent dye molecule capable of emitting fluorescence, wherein oxygen to be sensed by said polymeric sensing membrane is capable of collisionally quenching said fluorescence of said fluorescent dye molecule, and wherein said first selecting step is step b);admixing said fluorescent dye molecule with said polymer to form a mixture; and forming said mixture into said polymeric sensing membrane. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification