摘要:
In the invention, a collection device includes a flow through micro scale plate arranged to collect analyte. The plate includes holes, and sorbent coating on contact surfaces of the plate. The holes pass analyte fluid flow, for example analyte vapor so that fluid flow for collection may be generally perpendicular to the sorbent plate. Preferred embodiment plates include an integrated heater trace. In preferred embodiments, a high substantially perpendicular flow is used for collection and concentration, and during desorption and delivery a low substantially parallel flow is used. The low flow is selected to meet constraints of a detector system.
摘要:
In the invention, a collection device includes a flow through micro scale plate arranged to collect analyte. The plate includes holes, and sorbent coating on contact surfaces of the plate. The holes pass analyte fluid flow, for example analyte vapor so that fluid flow for collection may be generally perpendicular to the sorbent plate. Preferred embodiment plates include an integrated heater trace. In preferred embodiments, a high substantially perpendicular flow is used for collection and concentration, and during desorption and delivery a low substantially parallel flow is used. The low flow is selected to meet constraints of a detector system.
摘要:
In the invention, a collection device includes a flow through micro scale plate arranged to collect analyte. The plate includes holes, and sorbent coating on contact surfaces of the plate. The holes pass analyte fluid flow, for example analyte vapor so that fluid flow for collection may be generally perpendicular to the sorbent plate. Preferred embodiment plates include an integrated heater trace. In preferred embodiments, a high substantially perpendicular flow is used for collection and concentration, and during desorption and delivery a low substantially parallel flow is used. The low flow is selected to meet constraints of a detector system.
摘要:
This invention relates generally to a new class of chemoselective polymer materials. In particular, the invention relates to linear polycarbosilane compounds for use in various analytical applications involving sorbent polymer materials, including chromatoghraphy, chemical trapping, analyte collection, and chemical sensor applications. These polymers have pendant and terminal aryl, alkyl, alkenyl, and alkynyl groups that are functionalized with halogen substituted alcohol or phenol groups, having the general structure: wherein n is an integer greater than 1; wherein at least one of R1 and R2 is a linear or branched arm having at least one group independently selected from the group consisting of alkyl, alkenyl, alkynyl, and aryl groups, or combinations thereof, and having at least one halogen substituted alcohol or phenol groups attached thereto; wherein any said R1 and R2 aryl groups are attached to said [Si—X-]n either directly or through a short hydrocarbon chain; wherein any remaining said R1 or R2 group is a hydrocarbon or carbosilane group; wherein X is a polymer component selected from the group consisting of alkylene, alkenylene, alkynylene, arylene groups, and combinations thereof; and wherein Z1 and Z2 are end groups independently selected from the group consisting of alkyl, alkenyl, alkynyl, aryl, alkyl silanes, aryl silanes, hydroxyl, silicon hydride, alkoxides, phenols, halogen substituted alcohols, halogen substituted phenols, organosilyl, and combinations thereof. These polymeric materials are primarily designed to sorb hydrogen bond basic analytes such as organophosphonate esters (nerve agents and precursors) and nitro-substituted compounds (explosives).
摘要:
In the invention, a collection device includes a first micro scale plate having a sorbent surface and a through hole. The through hole provides for the passage of an analyte fluid flow through the plate, and it has a volume and geometry to provide contact between the fluid and the sorbent surface in an amount effective to absorb a sufficient amount of analyte for subsequent detection of the analyte. The sorbent surface can be provided by a sorbent coating such as an active sensing film, e.g. a conducting or optically active material, examples of which include conducting polymers, polymer/carbon composites, carbon nanotubes, and dye-containing materials. The analyte collection device preferably includes a heating source, e.g. a heating element formed from a resistive trace, or a plurality of resistive traces, on or within the first microscale plate, for effecting a thermal release of collected analyte from the plate.
摘要:
A sensing device having: a bottom electrode, a dielectric on the bottom electrode, a grid of nanoelectrodes on the dielectric, and a top electrode in electrical contact with the grid. A method of chemical or biological sensing comprising: providing a grid of nanoelectrodes; exposing the grid to fluid suspected of containing a chemical or biological analyte; and measuring a change in the capacitance and conductance of the grid.
摘要:
This invention relates generally to a new class of chemoselective polymer materials. In particular, the invention relates to linear polycarbosilane compounds for use in various analytical applications involving sorbent polymer materials, including chromatography, chemical trapping, analyte collection, and chemical sensor applications. These polymers have pendant and terminal aryl, alkyl, alkenyl, and alkynyl groups that are functionalized with halogen substituted alcohol or phenol groups, having the general structure: wherein n is an integer greater than 1; wherein at least one of R1 and R2 is a pendant group having at least one aryl group independently selected from the group consisting of a phenol, a halogen substituted phenol, and an aryl hydrocarbon with a halogen substituted alcohol substitutent, or combinations thereof; wherein any said R1 and R2 aryl groups are attached to said [Si—X—]n either directly or through a short hydrocarbon chain; wherein any remaining said R1 or R2 group is a hydrocarbon or carbosilane group; wherein X is a polymer component selected from the group consisting of alkylene, alkenylene, alkynylene, arylene groups, and combinations thereof; and wherein Z1 and Z2 are end groups independently selected from the group consisting of alkyl, alkenyl, alkynyl, aryl, alkyl silanes, aryl silanes, hydroxyl, silicon hydride, alkoxides, phenols, halogen substituted alcohols, halogen substituted phenols, organosilyl, and combinations thereof. These polymeric materials are primarily designed to sorb hydrogen bond basic analytes such as organophosphonate esters (nerve agents and precursors) and nitro-substituted compounds (explosives).
摘要:
A sensing device having: a bottom electrode, a dielectric on the bottom electrode, a grid of nanoelectrodes on the dielectric, and a top electrode in electrical contact with the grid. A method of chemical or biological sensing comprising: providing a grid of nanoelectrodes; exposing the grid to fluid suspected of containing a chemical or biological analyte; and measuring a change in the capacitance and conductance of the grid.
摘要:
The present invention provides a device for selective molecular recognition, the device comprising a sensing portion, wherein said sensing portion includes a substrate having coated thereon a layer comprising a dendrimeric compound having: (1) a core portion; (2) at least one unsaturated arms extending radially from the core portion; and (3) at least one halogen substituted alcohol substituted at the terminus, the interior, or both of each; The device is used to detect the molecules of a hydrogen bond accepting vapor such as organophosphorus or nitroaromatic species.
摘要:
A sensor and a method for sensing a change in mass of a reflective microbeam in a sensor, the sensor having a reflective layer disposed on a substrate and spaced apart from the reflective microbeam. The microbeam receives amplitude modulated laser energy at a first wavelength and is photothermally excited into resonance at the frequency of amplitude modulation, the reflective microbridge and the reflective layer receive optical energy at a second wavelength and reflect the optical energy toward a receiver. A change in reflectivity of the microbeam at different frequencies is determined. A change in reflectivity indicates a change in resonant frequency of the microbeam. Mass of the microbeam changes when a chemoselective material on the microbeam sorbs a target chemical.