SURFACE MODIFIED MATRIX BARRIER FOR A GAS DETECTOR DEVICE
A gas detector device including a porous matrix barrier disposed between one or more gas sensors and an environment exterior to the gas detector device. The porous matrix barrier includes a coating disposed on a matrix member surface, the coating imparting at least one of hydrophobic or oleophobic characteristic to the matrix member surface.
1 . A gas detector device comprising:
a porous matrix barrier disposed between one or more gas sensors and an environment exterior to the gas detector device, wherein the porous matrix barrier comprises a coating disposed on a member matrix surface, the coating imparting at least one of hydrophobic or oleophobic characteristic to the member matrix surface.
2 . The gas detector device of claim 1 , wherein the porous matrix barrier is a sintered metal or metal oxide, a ceramic, a molecular sieve, a metal screen, or matted or woven glass or polymer fibers.
3 . The gas detector device of claim 1 , wherein the coating comprises an organo-fluorine group and is derived from a mixture of silane, a hydroxysilane, alkoxysilane, an organosilane, or a mixture thereof, and a fluorosilane, an organofluorosilane, or a mixture thereof.
4 . The gas detector device of claim 1 , wherein the coating comprises an organo-fluorine group and is derived from a mixture of tetraethoxysilane, hexamethyldisilane, hexamethyldisilazane, hexamethyldisiloxane, or a mixture thereof, and a fluorine containing gas.
5 . The gas detector device of claim 1 , wherein the coating comprises an organo-fluorine group and is derived from a compound of Formula 1:
wherein,
\R 1 is a C 1 -C 5 alkoxy or C n F 2n+1 -(CH 2 ) m -Si(R 2 R 3 )-O-,
R 2 and R 3 are independently C 1 -C 5 alkyl or C 1 -C 5 alkoxy,
n is 1 to 12, and m is 1 to 6.
6 . The gas detector device of claim 2 , wherein the molecular sieve comprises zeolites, metal organic frameworks, engineered activated carbon, clay, and combinations thereof.
7 . The gas detector device of claim 1 , wherein the gas sensor includes at least one of the following:
an electrochemical sensor that includes a membrane electrode assembly;
a MOS sensor;
a hot catalytic gas sensor element;
an optical sensor;
a thermal conductivity sensor;
a non-dispersive infrared sensor;
a metal oxide sensor;
a photoionization sensor; or
a combination or array of the above chemical sensors.
8 . The gas detector device of claim 1 , further comprising a weather shield.
9 . The gas detector of claim 8 , wherein the weather shields includes a shield member with a surface coating that imparts at least one of hydrophobic or oleophobic characteristic.
10 . The gas detector device of claim 1 , wherein the porous matrix has a thickness of 10 micrometers to 5000 micrometers.
11 . The gas detector device of claim 1 , wherein the porous matrix has a thickness of greater than 5 millimeters.
12 . The gas detector device of claim 1 , wherein the coating comprises silicone nanoparticles derived from one or more compounds of Formula 2
wherein
R 5 is a straight-chain or branched C1-C24 alkyl, a C2-C24 alkenyl group, or a C5-C14 aromatic group, which is linked to the silicon atom by a covalent bond or a C1-C8 straight-chain or branched alkylene linker;
R 6 a straight chain or a branched C1-C6 hydrocarbon group;
X 1 is a hydrolysable group, and is a halogen or a C1-C6 alkoxy group, and
n is 0 or 1.
13 . The gas detector device of claim 12 , wherein the silicone nanoparticles are present in the form of nanofilaments or nanotubes having a diameter of from 30 nm to 100 nm.
14 . The gas detector device of claim 9 , wherein the surface coating of the shield member comprises an organo-fluorine group and is derived from a mixture of silane, a hydroxysilane, an alkoxysilane, an organosilane, or a mixture thereof, and a fluorosilane, an organofluorosilane, or a mixture thereof.
15 . The gas detector device of claim 9 , wherein the surface coating of the shield member comprises an organo-fluorine group and is derived from a compound of Formula 1:
wherein,
R 1 is a C 1 -C 5 alkoxy or C n F 2n+1 -(CH 2 ) m -Si(R 2 R 3 )-O-,
R 2 and R 3 are independently C 1 -C 5 alkyl or C 1 -C 5 alkoxy,
n is 1 to 12, and m is 1 to 6.
16 . The gas detector device of claim 7 , wherein the gas sensor is an electrochemical sensor that includes a membrane electrode assembly.
17 . The gas detector device of claim 7 , wherein the gas sensor is a hot catalytic gas sensor element.
18 . The gas detector device of claim 7 , wherein the gas sensor is an optical sensor or a thermal conductivity sensor.