Preconcentration Modeling for the Optimization of a Micro Gas Preconcentrator Applied to Environmental Monitoring

Camara, M.; Breuil, Philippe; Briand, D.; Viricelle, Jean‐Paul; Pijolat, Christophe; Rooij, N. F. de

doi:10.1021/acs.analchem.5b00400

Cited by 22 publications

(28 citation statements)

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“…Faster heating rates lead to sharper chromatographic peaks and thus higher limits of detection. 7 For our device, the temperature increased rapidly and consistently, heating from 40 °C to 200 °C in 30 sec (average heating ramp of first 30 sec, 5.40 ± 0.03 °C/sec). With only 28 V DC applied to the heater, a maximum increase of 17.6 °C/s was observed.…”

Section: Resultsmentioning

confidence: 64%

“…With only 28 V DC applied to the heater, a maximum increase of 17.6 °C/s was observed. Other researchers have reported maximum desorption heating rates of 2.67 °C/s, 7, 19 10.0 °C/s, 12 13.4 °C/s 24 and 25 °C/s. 18 Compared to these devices, our preconcentrator heats at a relatively fast rate.…”

Section: Resultsmentioning

confidence: 90%

“…An equation for sample concentration ( C ), flow rate ( f ) and sample time ( t ) during adsorption ( a ) and desorption ( d ) from mass conservation provides: Ca⋅fa⋅ta=Cd⋅fd⋅td Hence, the ratio of desorption concentration and adsorption concentration is given by: CdCa=fa⋅tafd⋅td So, higher adsorption flow rates and lower desorption flow rates theoretically yield better chemical detection. 7…”

Section: Resultsmentioning

confidence: 99%

“…This has been demonstrated in systems such as micro gas chromatographs 2–6 and organic vapor sensors. 7–10…”

mentioning

confidence: 99%

“…Devices should achieve high adsorption flows, low desorption flows and increased limits of detection. 7,13 Precise thermal management is also of particular importance. 14–15…”

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confidence: 99%

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An Easy to Manufacture Micro Gas Preconcentrator for Chemical Sensing Applications

et al. 2017

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We have developed a simple-to-manufacture microfabricated gas preconcentrator for MEMS-based chemical sensing applications. Cavities and microfluidic channels were created using a wet etch process with hydrofluoric acid, portions of which can be performed outside of a cleanroom, instead of the more common deep reactive ion etch process. The integrated heater and resistance temperature detectors (RTDs) were created with a photolithography-free technique enabled by laser etching. With only 28 V DC (0.1 A), a maximum heating rate of 17.6 °C/s was observed. Adsorption and desorption flow parameters were optimized to be 90 SCCM and 25 SCCM, respectively, for a multicomponent gas mixture. Under testing conditions using Tenax TA sorbent, the device was capable of measuring analytes down to 22 ppb with only a 2 min sample loading time using a gas chromatograph with a flame ionization detector. Two separate devices were compared by measuring the same chemical mixture; both devices yielded similar peak areas and widths (fwhm: 0.032-0.033 min), suggesting reproducibility between devices.

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Section: Resultsmentioning

confidence: 64%

Section: Resultsmentioning

confidence: 90%

Section: Resultsmentioning

confidence: 99%

“…This has been demonstrated in systems such as micro gas chromatographs 2–6 and organic vapor sensors. 7–10…”

mentioning

confidence: 99%

“…Devices should achieve high adsorption flows, low desorption flows and increased limits of detection. 7,13 Precise thermal management is also of particular importance. 14–15…”

mentioning

confidence: 99%

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