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Article

Reconfigurable Modular Platform for Prolonged Sensing of Toxic Gases in Particle Polluted Environments

1
Wireless Fluidics Inc., 2500 University Dr. N.W., Calgary, AB T2N 1N4, Canada
2
Center for Bioengineering Research and Education, BioMEMS and Bioinspired Microfluidic Laboratory, Department of Mechanical and Manufacturing Engineering, University of Calgary, Calgary, AB T2N 1N4, Canada
3
College of Engineering and Applied Sciences, American University of Kuwait, AUK, Salmiya P.O. Box 3323, Kuwait
4
Department of Chemical Engineering, School of Engineering Technology and Industrial Trades, College of the North Atlantic—Qatar, Arab League St., Doha 24449, Qatar
*
Author to whom correspondence should be addressed.
Academic Editor: Jose Vicente Ros Lis
Chemosensors 2021, 9(11), 328; https://doi.org/10.3390/chemosensors9110328
Received: 5 October 2021 / Revised: 12 November 2021 / Accepted: 20 November 2021 / Published: 22 November 2021
(This article belongs to the Special Issue Microfluidic-Based Chemical and Biochemical Sensors)
The prolonged sensing of toxic gases in polluted particles and harsh environments is a challenging task that is also in high demand. In this work, the proof of principle of a sensitive, low-cost, and low-maintenance reconfigurable platform for filter-free and continuous ammonia (NH3) sensing in polluted environments is simulated. The platform can be modified for the detection of various toxic gases and includes three main modules: a microfluidic system for in-line continuous dust filtering; a toxic gas adsorption module; and a low-frequency microwave split-ring resonator (SRR). An inertia-based spiral microfluidic system has been designed and optimized through simulation for the in-line filtration of small particles from the intake air. Zeolite Y is selected as the adsorbent in the adsorption module. The adsorption module is a non-metallic thin tube that is filled with zeolite Y powder and precisely fixed at the drilled through-hole into the 3D microwave system. For the sensing module, a low-frequency three-dimensional (3D) split-ring resonator is proposed and optimally designed. A microwave resonator continuously monitors the permittivity of zeolite Y and can detect small permittivity alterations upon the presence of ammonia in the intake air. The microwave resonator is optimized at a frequency range of 2.5–3 GHz toward the detection of ammonia under different ammonia concentrations from 400 to 2800 ppm. The microwave simulation results show a clear contrast of around 4 MHz that shifts at 2.7 GHz for 400 ppm ammonia concentration. The results show the proof of principle of the proposed microfluidic-microwave platform for toxic gas detection. View Full-Text
Keywords: microfluidics; microwave; 3D split-ring resonator; adsorption; toxic gas detection; ammonia (NH3) detection; integrated sensor; particle separation; environmental monitoring microfluidics; microwave; 3D split-ring resonator; adsorption; toxic gas detection; ammonia (NH3) detection; integrated sensor; particle separation; environmental monitoring
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MDPI and ACS Style

Sadabadi, H.; Bostani, A.; Esmaeili, A.S. Reconfigurable Modular Platform for Prolonged Sensing of Toxic Gases in Particle Polluted Environments. Chemosensors 2021, 9, 328. https://doi.org/10.3390/chemosensors9110328

AMA Style

Sadabadi H, Bostani A, Esmaeili AS. Reconfigurable Modular Platform for Prolonged Sensing of Toxic Gases in Particle Polluted Environments. Chemosensors. 2021; 9(11):328. https://doi.org/10.3390/chemosensors9110328

Chicago/Turabian Style

Sadabadi, Hamid, Ali Bostani, and Amin S. Esmaeili. 2021. "Reconfigurable Modular Platform for Prolonged Sensing of Toxic Gases in Particle Polluted Environments" Chemosensors 9, no. 11: 328. https://doi.org/10.3390/chemosensors9110328

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