scholarly journals Production and Measurement of Organic Particulate Matter in the Harvard Environmental Chamber

10.3791/55685 ◽  
2018 ◽  
Author(s):  
Yue Zhang ◽  
Zhaoheng Gong ◽  
Suzane de Sa ◽  
Adam P. Bateman ◽  
Yingjun Liu ◽  
...  
Keyword(s):  
Particulate Matter ◽  
Environmental Chamber ◽  
Organic Particulate Matter

scholarly journals Linking Oxidative Events to Inflammatory and Adaptive Gene Expression Induced by Exposure to an Organic Particulate Matter Component

2012 ◽  
Vol 120 (2) ◽  
pp. 267-274 ◽  
Author(s):  
Wan-Yun Cheng ◽  
Jenna Currier ◽  
Philip A. Bromberg ◽  
Robert Silbajoris ◽  
Steven O. Simmons ◽  
...  
Keyword(s):  
Gene Expression ◽  
Particulate Matter ◽  
Organic Particulate Matter ◽  
Matter Component

scholarly journals Relative humidity-dependent viscosity of secondary organic material from toluene photo-oxidation and possible implications for organic particulate matter over megacities

2016 ◽  
Author(s):  
M. Song ◽  
P. F. Liu ◽  
S. J. Hanna ◽  
R. A. Zaveri ◽  
K. Potter ◽  
...  
Keyword(s):  
Particulate Matter ◽  
Relative Humidity ◽  
Diffusion Coefficients ◽  
Organic Material ◽  
Organic Molecules ◽  
Mixing Times ◽  
Organic Particulate Matter ◽  
Photo Oxidation ◽  
Diffusion Rates ◽  
And Diffusion

Abstract. To improve predictions of air quality, visibility, and climate change, knowledge of the viscosities and diffusion rates within organic particulate matter consisting of secondary organic material (SOM) is required.Most qualitative and quantitative measurements of viscosity and diffusion rates within organic particulate matter have focused on SOM particles generated from biogenic VOCs such as α-pinene and isoprene. In this study, we quantify the relative humidity (RH)-dependent viscosities at 295 ± 1 K of SOM produced by photo-oxidation of toluene, an anthropogenic VOC. The viscosities of toluene-derived SOM were 2 × 10−1 to ∼6 × 106 Pa·s from 30 to 90 % RH, and greater than ~2 × 108 Pa·s (similar to or greater than the viscosity of tar pitch) for RH ≤ 17 %. These viscosities correspond to Stokes-Einstein-equivalent diffusion coefficients for large organic molecules of ~2 × 10−15 cm2·s−1 for 30 % RH, and lower than ~3 × 10−17 cm2·s−1 for RH ≤ 17 %. Based on these estimated diffusion coefficients, the mixing time of large organic molecules within 200 nm toluene-derived SOM particles is 0.1–5 hr for 30 % RH, and higher than ~100 hr for RH ≤ 17 %. These results were used, as a first-order approximation, to estimate if organic particulate matter will be in well-mixed over the world's top 15 most populous megacities. If the organic particulate matter in the megacities is similar to the toluene-derived SOM in this study, in Kolkata, Istanbul, Dhaka, Tokyo, Shanghai, and Mumbai, mixing times in organic particulate matter during extended periods of the year will be very short, and well-mixed particles can be assumed. On the other hand, the mixing times of large organic molecules in organic particulate matter in Delhi, Beijing, Mexico City, Cairo, and Karachi may be long and the particles may not be well-mixed in the afternoon (3:00–5:00 local time) during certain times of the year.

scholarly journals Highly Viscous States Affect the Browning of Atmospheric Organic Particulate Matter

2018 ◽  
Vol 4 (2) ◽  
pp. 207-215 ◽  
Author(s):  
Pengfei Liu ◽  
Yong Jie Li ◽  
Yan Wang ◽  
Adam P. Bateman ◽  
Yue Zhang ◽  
...  
Keyword(s):  
Particulate Matter ◽  
Organic Particulate Matter

scholarly journals Molecular view modeling of atmospheric organic particulate matter: Incorporating molecular structure and co-condensation of water

2015 ◽  
Vol 122 ◽  
pp. 400-408 ◽  
Author(s):  
James F. Pankow ◽  
Marguerite C. Marks ◽  
Kelley C. Barsanti ◽  
Abdullah Mahmud ◽  
William E. Asher ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Particulate Matter ◽  
Organic Particulate Matter
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