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Vapor sensor and materials therefor

A sensor, conductivity sensor technology, applied in the analysis of materials, material resistance, material analysis by electromagnetic means, etc., can solve problems such as the need for low-resistance sensors

Active Publication Date: 2008-03-05
THERM O DISC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Also, in many applications only small amounts of current can be used and low resistance sensors are required

Method used

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  • Vapor sensor and materials therefor
  • Vapor sensor and materials therefor
  • Vapor sensor and materials therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] Add the following materials to the mixer: 4.45 grams of VAT-4326 (3-5% vinyl methicone) / (45-52% octyl methicone) / (dimethyl methicone) terpolymer, 3.23 g (7-13% hydroxymethyl siloxane) / (87-93% octyl methicone) copolymer, 19.31 g Asahi15HS (obtained from Asahi Carbon Company The large particle size carbon black, its N 2 Value is 14m 2 / g, and DBP is 85ml / 100g), 4.46 grams of C10 M250 UNS (ground carbon fiber from SGL Carbon Group) and 0.08 grams of SIP 6829 (platinum carbonyl cyclovinylmethylsiloxane catalyst complex), prepared A sensor film having a cross-linked large pendant hydrocarbyl substituted siloxane polymer matrix in which the first conductive particle species is large particle size conductive carbon black and the second species is carbon fiber. These materials were mixed in a Brabendel(R) stick machine at 80 rpm for 15 minutes at 30°C to form a matrix mixture. The mixture is then coated into the grooves on the electrodes in the sensor structure. The sensor ...

Embodiment 2

[0077] The following materials were added to the mixer: 0.11 grams of VAT-4326 (3-5% Vinylmethylsiloxane) / (45-52% Octylmethicone) / (Dimethicone) from Gelest methicone) terpolymer, 10.3 g (7-13% hydroxymethyl siloxane) / (87-93% octyl methicone) copolymer, 18.5 g Asahi 15HS (White Asahi Carbon Company's large particle size carbon black, its N 2 Value is 14m 2 / g, and DBP is 85ml / 100g), 4.0 grams of 210 type nickel (210 type fine nickel powder from Inco Ltd., a subsidiary of Novamet), and 0.086 grams of SIP 6829 (platinum carbonyl cyclovinylmethylsiloxane catalyst Composite) to prepare a sensor film having a cross-linked large-side hydrocarbyl-substituted siloxane polymer matrix, the first conductive particle species in the polymer matrix is ​​large-diameter conductive carbon black, and the second species includes nickel. These materials were mixed in a Brabender(R) mixer at 80 rpm for 15 minutes at 30°C to form a matrix mixture. The mixture is then coated into the grooves on th...

Embodiment 3

[0079] The following materials were added to the mixer: 0.11 grams of VAT-4326 (3-5% Vinylmethylsiloxane) / (45-52% Octylmethicone) / (Dimethicone) from Gelest methicone) terpolymer, 10.2 g (7-13% hydroxymethyl siloxane) / (87-93% octyl methicone) copolymer, 18.4 g Asahi 15HS (obtained from AsahiCarbon Company The large particle size carbon black, its N 2 Value is 14m 2 / g, and DBP is 85ml / 100g), 4.6 grams of 210 type nickel (210 type fine nickel powder from Inco Ltd., a subsidiary of Novamet), and 0.085 grams of SIP 6829 (platinum carbonyl cyclovinylmethylsiloxane catalyst Composite) to prepare a sensor film having a cross-linked large-side hydrocarbyl-substituted siloxane polymer matrix, the first conductive particle species in the polymer matrix is ​​large-diameter conductive carbon black, and the second species includes nickel. These materials were mixed in a Brabender(R) mixer at 80 rpm for 15 minutes at 30°C to form a matrix mixture. The mixture is then coated into the groo...

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Abstract

The present disclosure relates to a composition for sensor films used for detecting chemical analytes within sensors, such as polymer-absorption chemiresistors (i.e., conductometric sensors). The present disclosure provides robust sensor film compositions that have low resistance, high conductivity, and greater temperature stability and sensitivity to chemical analytes, as well as methods of making these sensor films. Sensor film compositions according to the present disclosure include a matrix having a polymer resin comprising siloxane and a plurality of conductive particles including at least two distinct species.

Description

[0001] Cross References to Related Applications [0002] This application is a continuation-in-part of US Patent Application Serial No. 10 / 411,805, filed April 11, 2003, which is hereby incorporated by reference in its entirety. technical field [0003] This invention relates to sensor films, and more particularly, to sensor films for the detection of vapor analytes. Background technique [0004] The detection of a specific target analyte or compound is important for many applications including, for example, detecting whether the concentration of the analyte exceeds the autoflammability limit. It is known in the art that target analytes are detected by sensors that operate according to different detection mechanisms. Most sensors employ sensing elements that physically change in the presence of a particular analyte in the environment. Accordingly, a sensor typically includes a probe that includes a sensing element and a probe body housing (including terminals for deliverin...

Claims

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Application Information

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IPC IPC(8): G01N27/12G01N27/04
CPCG01N27/126
Inventor E·J·布洛克P·C·拉马穆尔蒂J·斯塔林B·S·阿马迪奥
Owner THERM O DISC
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