A zone-heated gas chromatographic microcolumn: Energy efficiency
| Autor: | Sanketh Buggaveeti, Robert Nidetz, Edward T. Zellers, Nicolas Nuñovero, Junqi Wang, Katsuo Kurabayashi, Zhijin Lin |
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| Rok vydání: | 2018 |
| Předmět: |
Resistive touchscreen
Chromatography Polydimethylsiloxane 010401 analytical chemistry Metals and Alloys Analytical chemistry 02 engineering and technology Energy consumption 021001 nanoscience & nanotechnology Condensed Matter Physics Chip 01 natural sciences Isothermal process 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry.chemical_compound Substrate (building) chemistry Materials Chemistry Electrical and Electronic Engineering 0210 nano-technology Instrumentation Energy (signal processing) Efficient energy use |
| Zdroj: | Sensors and Actuators B: Chemical. 254:561-572 |
| ISSN: | 0925-4005 |
| DOI: | 10.1016/j.snb.2017.07.065 |
| Popis: | A microfabricated separation column designed for ultimate use in a wearable gas chromatographic micro-analytical system (μGC) for analyzing mixtures of airborne volatile organic compounds (VOC) is described. The monolithic μcolumn chip measures 7.1 × 2.7 × 0.075 cm and contains a 6-m long, 250 × 140 μm deep-reactive-ion-etched Si channel with a Pyrex cap, wall-coated with a polydimethylsiloxane (PDMS) stationary phase. Along the channel are three serial 2-m long spiral segments, each with an independent integrated resistive heater and thermal isolation features etched in the substrate. By turning the segment heaters on and off at strategic points during a separation, significant energy savings could be realized relative to heating the entire chip simultaneously (i.e., globally), with no loss in chromatographic resolution. A classical lumped element model was used as the basis for simulations of energy consumption, and a published band trajectory model was used to estimate analyte residence times in each segment. Four simple mixtures of volatile organic chemicals were used to evaluate the models and assess the energy consumed for zone heating and global heating under isothermal and temperature-ramped conditions. Modeled reductions in the required energy per analysis using zone (vs. global) heating ranged from 14 to 31% among the cases considered, depending on the heating profile (i.e., isothermal or ramped), heating schedule, and the retention times of the analytes in the mixture. Modeled energy reductions tended to underestimate experimental reductions, but differed by |
| Databáze: | OpenAIRE |
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