Monitoring gas adsorption on functional thin films using microfluidic channels
| Autor: | Benyamin Harkinezhad, Sadaf Yari, Faramarz Hossein-Babaei |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Drop (liquid) 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences chemistry.chemical_compound Surface coating Adsorption PEDOT:PSS chemistry Surface-area-to-volume ratio Chemical engineering Acetone Gaseous diffusion Thin film 0210 nano-technology |
| Zdroj: | 2020 28th Iranian Conference on Electrical Engineering (ICEE). |
| Popis: | The increasing significance of the gaseous environmental pollutants has made their detection and control profoundly important. The late fall air quality drop in Tehran clearly indicated the vitality of the issue. Here, we introduce a microfluidic-based method for the quantitative assessment of the interaction between the volatile organic vapor molecules and the apparent surfaces of poly(3,4-ethylenedioxythiophene): poly-(styrene sulfonate) (PEDOT:PSS) thin-films. The diffusion of gases in a PEDOT:PSS coated microfluidic channel, characterized by a high surface to volume ratio, is monitored and the obtained data is used to analyze the adsorption of the gases to the wall surface coating. N-hexane and acetone are used as the example gases. The adsorption properties of these gases are determined from comparisons between the experimental data and estimations carried out using the mathematical model describing the process. The results indicate a higher adsorption coefficient for acetone. This is believed to be in accord with the polarized nature of the acetone molecules allowing hydrogen bond formation with the PEDOT:PSS surface. The method enables a fast, reliable and cost-effective evaluation technique for quantifying the ability of different surface coatings to adsorb the polluting volatile organic vapors from the air. |
| Databáze: | OpenAIRE |
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