| Title: | "Kinetic multi-layer model of film formation, growth, and chemistry (KM-FILM): Boundary layer processes, multi-layer adsorption, bulk diffusion, and heterogeneous reactions" |
| Author(s): | Lakey PSJ; Eichler CMA; Wang C; Little JC; Shiraiwa M; |
| Address: | "Department of Chemistry, University of California, Irvine, CA, USA. Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg, VA, USA. Department of Environmental Sciences and Engineering, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA" |
| ISSN/ISBN: | 1600-0668 (Electronic) 0905-6947 (Linking) |
| Abstract: | "Large surface area-to-volume ratios indoors cause heterogeneous interactions to be especially important. Semi-volatile organic compounds can deposit on impermeable indoor surfaces forming thin organic films. We developed a new model to simulate the initial film formation by treating gas-phase diffusion and turbulence through a surface boundary layer and multi-layer reversible adsorption on rough surfaces, as well as subsequent film growth by resolving bulk diffusion and chemical reactions in a film. The model was applied with consistent parameters to reproduce twenty-one sets of film formation measurements due to multi-layer adsorption of multiple phthalates onto different indoor-relevant surfaces, showing that the films should initially be patchy with the formation of pyramid-like structures on the surface. Sensitivity tests showed that highly turbulent conditions can lead to the film growing by more than a factor of two compared to low turbulence conditions. If surface films adopt an ultra-viscous state with bulk diffusion coefficients of less than 10(-18) cm(2) s(-1) , a significant decrease in film growth is expected. The presence of chemical reactions in the film has the potential to increase the rate of film growth by nearly a factor of two" |
| Keywords: | "Adsorption *Air Pollution, Indoor Diffusion Kinetics *Volatile Organic Compounds/analysis absorption kinetic modeling multi-species adsorption organic films semi-volatile organic compounds turbulence;" |
| Notes: | "MedlineLakey, Pascale S J Eichler, Clara M A Wang, Chunyi Little, John C Shiraiwa, Manabu eng Research Support, Non-U.S. Gov't England 2021/05/16 Indoor Air. 2021 Nov; 31(6):2070-2083. doi: 10.1111/ina.12854. Epub 2021 May 15" |
