| Title: | Influence of Functional Groups on the Viscosity of Organic Aerosol |
| Address: | "Department of Marine Earth and Atmospheric Sciences, North Carolina State University , Raleigh, North Carolina 27695, United States" |
| ISSN/ISBN: | 1520-5851 (Electronic) 0013-936X (Linking) |
| Abstract: | Organic aerosols can exist in highly viscous or glassy phase states. A viscosity database for organic compounds with atmospherically relevant functional groups is compiled and analyzed to quantify the influence of number and location of functional groups on viscosity. For weakly functionalized compounds the trend in viscosity sensitivity to functional group addition is carboxylic acid (COOH) approximately hydroxyl (OH) > nitrate (ONO(2)) > carbonyl (CO) approximately ester (COO) > methylene (CH(2)). Sensitivities to group addition increase with greater levels of prior functionalization and decreasing temperature. For carboxylic acids a sharp increase in sensitivity is likely present already at the second addition at room temperature. Ring structures increase viscosity relative to linear structures. Sensitivities are correlated with analogously derived sensitivities of vapor pressure reduction. This may be exploited in the future to predict viscosity in numerical models by piggybacking on schemes that track the evolution of organic aerosol volatility with age |
| Keywords: | Aerosols/*chemistry Gases Organic Chemicals/*chemistry Viscosity Volatilization; |
| Notes: | "MedlineRothfuss, Nicholas E Petters, Markus D eng Research Support, U.S. Gov't, Non-P.H.S. 2016/12/20 Environ Sci Technol. 2017 Jan 3; 51(1):271-279. doi: 10.1021/acs.est.6b04478. Epub 2016 Dec 19" |
