| Title: | Production and Measurement of Organic Particulate Matter in a Flow Tube Reactor |
| Author(s): | Zhang Y; Liu P; Gong Z; Geiger FM; Martin ST; |
| Address: | "School of Engineering and Applied Sciences, Harvard University; Department of Environmental Science and Engineering, Gillings School of Global Public Health, University of North Carolina, Chapel Hill; yzhang01@live.unc.edu. School of Engineering and Applied Sciences, Harvard University. Department of Chemistry, Northwestern University; geigerf@chem.northwestern.ed. School of Engineering and Applied Sciences, Harvard University; Department of Earth and Planetary Sciences, Harvard University; scot_martin@harvard.ed" |
| ISSN/ISBN: | 1940-087X (Electronic) 1940-087X (Linking) |
| Abstract: | "Organic particulate matter (PM) is increasingly recognized as important to the Earth's climate system as well as public health in urban regions, and the production of synthetic PM for laboratory studies have become a widespread necessity. Herein, experimental protocols demonstrate approaches to produce aerosolized organic PM by alpha-pinene ozonolysis in a flow tube reactor. Methods are described for measuring the size distributions and morphology of the aerosol particles. The video demonstrates basic operations of the flow tube reactor and related instrumentation. The first part of the video shows the procedure for preparing gas-phase reactants, ozonolysis, and production of organic PM. The second part of the video shows the procedures for determining the properties of the produced particle population. The particle number-diameter distributions show different stages of particle growth, namely condensation, coagulation, or a combination of both, depending on reaction conditions. The particle morphology is characterized by an aerosol particle mass analyzer (APM) and a scanning electron microscope (SEM). The results confirm the existence of non-spherical particles that have grown from coagulation for specific reaction conditions. The experimental results also indicate that the flow tube reactor can be used to study the physical and chemical properties of organic PM for relatively high concentrations and short time frames" |
| Keywords: | Aerosols/chemistry Air Pollutants/*chemistry Bicyclic Monoterpenes Environmental Monitoring/*methods Monoterpenes/chemistry Oxidation-Reduction Ozone/chemistry Particle Size Particulate Matter/*chemistry Volatile Organic Compounds/*chemistry; |
| Notes: | "MedlineZhang, Yue Liu, Pengfei Gong, Zhaoheng Geiger, Franz M Martin, Scot T eng Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. Video-Audio Media 2019/01/01 J Vis Exp. 2018 Dec 15; (142). doi: 10.3791/55684" |
