The Experts below are selected from a list of 231 Experts worldwide ranked by ideXlab platform
J M łysko - One of the best experts on this subject based on the ideXlab platform.
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portable Gas Chromatograph with integrated components
Sensors and Actuators A-physical, 2004Co-Authors: J Dziuban, J Mroz, M Szczygielska, M Malachowski, Anna Goreckadrzazga, Rafal Walczak, W Bula, D Zalewski, ł Nieradko, J M łyskoAbstract:Abstract In the paper, a portable Gas Chromatograph with silicon/glass integrated micromachined flushed injector and doubled thermal conductivity detectors (TCD) has been presented. The injector has two symmetrical dosing loops, each of 7 μl volume and one fast injection microvalve, pneumatically operated. All parts of the injector are integrated on 35×35×2.5 mm3 glass/silicon/glass die. Teflon coated thin polyimide foil is applied as the moving actuator of the microvalve of the injector. Three types of TCDs have been tested. In the first type of TCD, four thin-film Pt heaters/thermoresistors made on thin silicon nitride CVD deposited membrane suspended over deeply etched in a silicon substrate two channels, are applied. In the next two TCDs, miniature spirals made of thin Pt solid wire are assembled inside glass/silicon chip. Two configurations of spirals position have been tested: in-line serial and in-line parallel. Computer simulations, supported by experiments have indicated better parameters of TCD with parallel configuration of spirals. The TCDs with Pt spirals are resistant against carrier Gas decays. In the portable Gas Chromatograph two capillary columns are used: active (molecular sieve) and passive. Columns and co-working TCD are thermally stabilized in an oven equipped with a thick-film heater made on polyimide foil. The instrument is equipped with built-in microcomputer with two 16-bit microprocessors and is operated (controlled) by an external portable PC. All important parameters of analysis (possible single or continuous mode of work) are adjusted electronically, as well as data acquisition and preparing of the complete analysis effect in the form of chromatograms and tables indicating qualitative and quantitative composition of Gas mixture. The instrument is able to work in on-line continuous measurements, tests made for artificial atmosphere of deep mining industry have shown successful work of the instrument.
J Dziuban - One of the best experts on this subject based on the ideXlab platform.
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portable Gas Chromatograph with integrated components
Sensors and Actuators A-physical, 2004Co-Authors: J Dziuban, J Mroz, M Szczygielska, M Malachowski, Anna Goreckadrzazga, Rafal Walczak, W Bula, D Zalewski, ł Nieradko, J M łyskoAbstract:Abstract In the paper, a portable Gas Chromatograph with silicon/glass integrated micromachined flushed injector and doubled thermal conductivity detectors (TCD) has been presented. The injector has two symmetrical dosing loops, each of 7 μl volume and one fast injection microvalve, pneumatically operated. All parts of the injector are integrated on 35×35×2.5 mm3 glass/silicon/glass die. Teflon coated thin polyimide foil is applied as the moving actuator of the microvalve of the injector. Three types of TCDs have been tested. In the first type of TCD, four thin-film Pt heaters/thermoresistors made on thin silicon nitride CVD deposited membrane suspended over deeply etched in a silicon substrate two channels, are applied. In the next two TCDs, miniature spirals made of thin Pt solid wire are assembled inside glass/silicon chip. Two configurations of spirals position have been tested: in-line serial and in-line parallel. Computer simulations, supported by experiments have indicated better parameters of TCD with parallel configuration of spirals. The TCDs with Pt spirals are resistant against carrier Gas decays. In the portable Gas Chromatograph two capillary columns are used: active (molecular sieve) and passive. Columns and co-working TCD are thermally stabilized in an oven equipped with a thick-film heater made on polyimide foil. The instrument is equipped with built-in microcomputer with two 16-bit microprocessors and is operated (controlled) by an external portable PC. All important parameters of analysis (possible single or continuous mode of work) are adjusted electronically, as well as data acquisition and preparing of the complete analysis effect in the form of chromatograms and tables indicating qualitative and quantitative composition of Gas mixture. The instrument is able to work in on-line continuous measurements, tests made for artificial atmosphere of deep mining industry have shown successful work of the instrument.
R.d. Brock - One of the best experts on this subject based on the ideXlab platform.
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A protocol for onsite screening of volatile organic compounds using a portable Gas Chromatograph
Open-File Report, 1990Co-Authors: R.d. BrockAbstract:Onsite screening of volatile organic compounds in water, soil, and vapor matrices using portable Gas Chromatographs equipped with photoionization detectors has become an increasingly popular technique in hydrologic investigations. To be most effective, the proper equipment is required and the operator needs to be adequately trained. Because of changing environmental conditions, onsite operation of a Gas Chromatograph requires a rigorous instrumental protocol in order to ensure the quality of data produced. This report describes such a protocol.
Hu Meng - One of the best experts on this subject based on the ideXlab platform.
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a highly sensitive and fast responsive semiconductor metal oxide detector based on in2o3 nanoparticle film for portable Gas Chromatograph
Sensors and Actuators B-chemical, 2015Co-Authors: Hu Meng, Wei Yang, Yanggang Zhang, Liang Feng, Yafeng GuanAbstract:Abstract A highly sensitive and fast responsive semiconductor metal oxide detector based on In 2 O 3 nanoparticle film was developed and evaluated. The mechanical structure of the detector was properly designed to obtain a small chamber volume in order to well fit to a commercial Gas Chromatographic capillary column. The detector was constructed by coating In 2 O 3 nanoparticle film onto a small ceramic plate. Results indicate that the proposed semiconductor metal oxide detector in this study shows a fast response (several seconds) and a high sensitivity. Moreover, the detector can be operated at ambient condition, which largely simplifies the design of portable Gas Chromatograph. The fabricated detector was also used to detect Gas mixtures with a detection limit down to several ppb. It is concluded that the semiconductor metal oxide detector based on nanostructured materials possesses great potential for constructing portable Gas Chromatograph.
Wen Li - One of the best experts on this subject based on the ideXlab platform.
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CMOS monolithic chemiresistor array with microfluidic channel for micro Gas Chromatograph
2012 IEEE International Symposium on Circuits and Systems (ISCAS), 2012Co-Authors: Xiaoyi Mu, Nathan Ward, Gustavo Serrano, Elizabeth Covington, Cagliyan Kurdak, Andrew J. Mason, Wen Li, Lin Li, E.t. ZellersAbstract:A monolithic chemiresistor (CR) array micro-system with microfluidic channel for micro Gas Chromatograph (μGC) is presented in this paper. A CMOS readout chip was designed for amplifying and conditioning the signal of a 4×2 MPN-coated CR array fabricated on the surface of the CMOS chip. A micro glass lid with input and output capillary tubes was developed as a Gas flow channel and mounted on the CMOS array, providing an interface to a micro flow column in a μGC platform. After all of the CMOS-compatible processing, the monolithic CR array was tested within a GC platform, and both the CR array and circuit were demonstrated to function as designed.
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Adaptable chip-level microfluidic packaging for a micro-scale Gas Chromatograph
2012 7th IEEE International Conference on Nano Micro Engineered and Molecular Systems (NEMS), 2012Co-Authors: Nathan Ward, Xiaoyi Mu, Gustavo Serrano, Elizabeth Covington, Cagliyan Kurdak, Edward T. Zellers, Andrew J. Mason, Wen LiAbstract:In this paper, we present a robust and adaptable technique to integrate microfluidics with an on-chip thiolate-monolayer-protected gold nanoparticle coated chemiresistorarray for vapor analyte detection in a micro-scale Gas Chromatograph (μGC). The process involves mounting a sensing chip and capillary tubes within a silicon “extension carrier” (EC), capping the chemiresistor-array with a glass lid, and sealing the microfluidic package with non-sorbent epoxy. The stability and efficacy of the integrated detector cell is elucidated by consistent chip responses induced by the diffusion of vapor analytes though the detector cell.
