Systems and methods for collection and sampling of chemical species
Inventors
Martin, John F. • Powell, John R. • Ehntholt, Daniel J. • Drennan, Paul Michael • Jakubowski, Michael • McComish, Madeline
Assignees
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Publication Number
US-10024767-B2
Publication Date
2018-07-17
Expiration Date
Abstract
A method for collecting a compound from a surface, the method comprising providing a silicone adhesive collector comprising a silicone adhesive layer on a backing; contacting the silicone adhesives collector and a first solvent to provide a wetted collector; contacting the silicone adhesive layer of the silicone adhesive collector and a surface to be analyzed to provide a loaded collector; and removing the loaded collector from the surface to collect the compound. The disclosure also relates to a system for collecting a chemical compound from surfaces, the system comprising a silicone adhesive collector comprising a backing, and a silicone adhesive layer disposed on the backing; a first solvent; and instructions to dispose the first solvent on the silicone adhesive collector, the surface, or a combination thereof.
Core Innovation
The invention relates to a silicone-adhesive collector and a wetted-collector approach for collecting trace volatile and nonvolatile chemical species from surfaces. A silicone adhesive collector includes a silicone adhesive layer disposed directly on a backing, and the silicone adhesive layer comprises a cured silicone adhesive product of an ethylenically unsaturated organopolysiloxane, a SiH containing organopolysiloxane, and a hydrosilylation catalyst.
The collector is wetted by contacting the silicone adhesive collector with a first solvent to provide a wetted collector, prior to contacting a surface to be analyzed. After the wetted collector is contacted with the surface, the collector becomes a loaded collector, and the loaded collector is removed from the surface to collect the compound. The described materials and curing formulation are used to form the silicone adhesive layer for surface compound collection.
The system also includes instructions to dispose the first solvent on the silicone adhesive collector, the surface, or a combination thereof. The described approach is presented as improving collection from porous, textured, difficult, vertical, inverted, uneven, or heavily soiled surfaces, including collection from surfaces where other sampling approaches are not as effective.
Claims Coverage
The partial set includes two independent claims. Across these claims, the inventive coverage centers on the wetted silicone-adhesive collector approach combined with a specific cured silicone adhesive composition and defined first-solvent classes, with a system-level framing that includes solvent-disposal instructions.
Wetted silicone adhesive collector for surface compound collection
A method providing a silicone adhesive collector comprising a cured silicone adhesive product on a backing, wetted by contacting the silicone adhesive collector and a first solvent, then contacting the wetted silicone adhesive layer with a surface to provide a loaded collector, and removing the loaded collector from the surface to collect the compound.
Cured silicone adhesive composition with defined SiH-containing organopolysiloxane
The silicone adhesive layer comprises a cured silicone adhesive product of a composition comprising an ethylenically unsaturated organopolysiloxane, an SiH containing organopolysiloxane, and a hydrosilylation catalyst, where the SiH containing organopolysiloxane includes an organopolysiloxane having at least three SiH groups per molecule and an SiH terminated organopolysiloxane, with R1 selected from C1 to C8 alkyl, C1 to C8 perfluoroalkyl, or C6 to C8 aryl and X being H or R1.
First solvent class and wetted-collector formation
The first solvent comprises an alcohol, an aldehyde, a ketone, an ester, an ether, an amide, a hydrocarbon, acetonitrile, a sulfoxide, a sulfone, or a combination thereof, and contacting with the silicone adhesive collector provides a wetted collector.
System with solvent-disposal instructions for the silicone adhesive collector
A system comprising a silicone adhesive collector having a backing and a silicone adhesive layer with the cured silicone adhesive product and the defined SiH-containing organopolysiloxane, a first solvent comprising the specified solvent classes, and instructions to dispose the first solvent on the silicone adhesive collector, the surface, or a combination thereof.
Overall, the independent-claim scope covers collecting compounds from a surface using a silicone adhesive collector that is wetted with a first solvent to form a wetted collector, followed by loading and removal of the collector. The collector is defined by a specific cured silicone adhesive composition using an ethylenically unsaturated organopolysiloxane, a hydrosilylation catalyst, and a defined SiH-containing organopolysiloxane, and the system claim further specifies solvent-disposal instructions for the collector and/or the surface.
Stated Advantages
Improved collection from porous and textured surfaces and other difficult surfaces.
Unexpected improvements in collection efficiency versus gauze.
Enables collection of trace volatile and nonvolatile chemical species from surfaces.
Facilitates analysis of the loaded silicone adhesive collector to determine compound content, including detection by GC/MS.
Documented Applications
Sampling trace compounds from surfaces, including vertical/inverted/uneven/heavily soiled surfaces, and from porous and textured surfaces.
Collecting and analyzing compounds relevant to chemical warfare agents, pesticides, explosives, and contraband, as described in the document.
Analyzing a surface for a compound by collecting the compound using the claimed method and then analyzing the silicone adhesive collector to determine the content of the compound.
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