Compilation and evaluation of gas phase diffusion coefficients of halogenated organic compounds
Organic halogens are of great environmental and climatic concern. In this work, we have compiled their gas phase diffusivities (pressure-normalized diffusion coefficients) in a variety of bath gases experimentally measured by previous studies. It is found that diffusivities estimated using Fuller�...
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| Format: | Article |
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The Royal Society
2018-01-01
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| Series: | Royal Society Open Science |
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| Online Access: | https://royalsocietypublishing.org/doi/pdf/10.1098/rsos.171936 |
| _version_ | 1828467000640274432 |
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| author | Wenjun Gu Peng Cheng Mingjin Tang |
| author_facet | Wenjun Gu Peng Cheng Mingjin Tang |
| author_sort | Wenjun Gu |
| collection | DOAJ |
| description | Organic halogens are of great environmental and climatic concern. In this work, we have compiled their gas phase diffusivities (pressure-normalized diffusion coefficients) in a variety of bath gases experimentally measured by previous studies. It is found that diffusivities estimated using Fuller's semi-empirical method agree very well with measured values for organic halogens. In addition, we find that at a given temperature and pressure, different molecules exhibit very similar mean free paths in the same bath gas, and then propose a method to estimate mean free paths in different bath gases. For example, the pressure-normalized mean free paths are estimated to be 90, 350, 90, 80, 120 nm atm in air (and N2/O2), He, argon, CO2 and CH4, respectively, with estimated errors of around ±25%. A generic method, which requires less input parameter than Fuller's method, is proposed to calculate gas phase diffusivities. We find that gas phase diffusivities in He (and air as well) calculated using our method show fairly good agreement with those measured experimentally and estimated using Fuller's method. Our method is particularly useful for the estimation of gas phase diffusivities when the trace gas contains atoms whose diffusion volumes are not known. |
| first_indexed | 2024-12-11T03:59:49Z |
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| id | doaj.art-4234a0d1c59b4cb28fa332ee88d3e61c |
| institution | Directory Open Access Journal |
| issn | 2054-5703 |
| language | English |
| last_indexed | 2024-12-11T03:59:49Z |
| publishDate | 2018-01-01 |
| publisher | The Royal Society |
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| spelling | doaj.art-4234a0d1c59b4cb28fa332ee88d3e61c2022-12-22T01:21:41ZengThe Royal SocietyRoyal Society Open Science2054-57032018-01-015710.1098/rsos.171936171936Compilation and evaluation of gas phase diffusion coefficients of halogenated organic compoundsWenjun GuPeng ChengMingjin TangOrganic halogens are of great environmental and climatic concern. In this work, we have compiled their gas phase diffusivities (pressure-normalized diffusion coefficients) in a variety of bath gases experimentally measured by previous studies. It is found that diffusivities estimated using Fuller's semi-empirical method agree very well with measured values for organic halogens. In addition, we find that at a given temperature and pressure, different molecules exhibit very similar mean free paths in the same bath gas, and then propose a method to estimate mean free paths in different bath gases. For example, the pressure-normalized mean free paths are estimated to be 90, 350, 90, 80, 120 nm atm in air (and N2/O2), He, argon, CO2 and CH4, respectively, with estimated errors of around ±25%. A generic method, which requires less input parameter than Fuller's method, is proposed to calculate gas phase diffusivities. We find that gas phase diffusivities in He (and air as well) calculated using our method show fairly good agreement with those measured experimentally and estimated using Fuller's method. Our method is particularly useful for the estimation of gas phase diffusivities when the trace gas contains atoms whose diffusion volumes are not known.https://royalsocietypublishing.org/doi/pdf/10.1098/rsos.171936organic halogensgas phase diffusionmean free path |
| spellingShingle | Wenjun Gu Peng Cheng Mingjin Tang Compilation and evaluation of gas phase diffusion coefficients of halogenated organic compounds Royal Society Open Science organic halogens gas phase diffusion mean free path |
| title | Compilation and evaluation of gas phase diffusion coefficients of halogenated organic compounds |
| title_full | Compilation and evaluation of gas phase diffusion coefficients of halogenated organic compounds |
| title_fullStr | Compilation and evaluation of gas phase diffusion coefficients of halogenated organic compounds |
| title_full_unstemmed | Compilation and evaluation of gas phase diffusion coefficients of halogenated organic compounds |
| title_short | Compilation and evaluation of gas phase diffusion coefficients of halogenated organic compounds |
| title_sort | compilation and evaluation of gas phase diffusion coefficients of halogenated organic compounds |
| topic | organic halogens gas phase diffusion mean free path |
| url | https://royalsocietypublishing.org/doi/pdf/10.1098/rsos.171936 |
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