We describe a thin film sensor of carbon dioxide which relies on the change in capacitance of a fluoropolymer thin film caused by the difference in dielectric constants between air and carbon dioxide and by the preferred adsorption by the polymer of carbon dioxide compared to that of air. The fluoropolymer, Teflon AF 2400™, selectively adsorbs large quantities of CO2 with sufficient diffusivity to allow response times of a few seconds to be achieved. The sensor demonstrates completely linear response over its operating range from ppmv to 100% CO2. Sensor performance is currently limited by thermal drift and the need to remove all water vapour from the sample flow. Precision levels, currently at the level of 5–10 ppm, can be reduced to well below that of 1 ppm with proper redesign of the sensor. As part of these studies, the absolute solubilities of several compounds in Teflon AF 2400 were measured and are as follows (in units of µmoles cm−3 atm−1): air (16.6), CO2 (177), C2F6 (≈ 600), CF3CFH2 (≈ 800) and CF2ClCF2Cl (≈ 4500).
Change In Capacitance Thermal Drift Carbon Dioxide Sample Flow Preferred Adsorption Precision Levels Sensor Performance Dielectric Constants Capacitance Of Film Solubilities Of Compounds
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Round-ups are the summaries of handpicked papers around trending topics published every week. These would enable you to scan through a collection of papers and decide if the paper is relevant to you before actually investing time into reading it.
Climate change Research Articles published between Jan 23, 2023 to Jan 29, 2023
Jan 30, 2023
Articles Included: 3
Climate change adaptation has shifted from a single-dimension to an integrative approach that aligns with vulnerability and resilience concepts. Adapt...Read More
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