Effects of simulated tri-ethylene glycol coating with soot aerosol particle change on hygroscopicity
FAN Xiao-long1,2, CHEN Min-dong1, MA Ying-hui1, CHEN Chao1,2, WANG Yi-yi1
1. Jiangsu Key laboratory of Atmospheric Environment Monitoring and Pollution Control, Jiangsu Atmospheric Environment and Equipment Technology Collaborative Innovation Center, Jiangsu Environmental Purification Material Engineering Technology Research Center, School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, China;
2. Department of Chemistry and Environmental Science, New Jersey Institute of Technology, Newark 07102, USA
In this study, the effect of tri-ethylene glycol (TEG) coating on the hygroscopicity property of soot aerosol particle was investigated. Size-classified soot aerosol from an inverted diffusion burner was coated with TEG and its properties were characterized by mass-mobility measurements using a Hygroscopic Tandem Differential Mobility Analyzer (HTDMA) coupled with an Aerosol Particle Mass analyzer (APM). Additionally, the soot aerosol sample was characterized using Scanning Electron Microscopy (SEM). Different Particle sizes, including 100nm, 200nm and 300nm, were selected into simulated TEG coating measurement. Significant restructuring of soot aggregates was observed in the presence of sub-nanometer layers of TEG. Due to the hygroscopic property of TEG and lower surface tension (σ) than water at room temperature, the presence of TEG made soot aggregates hygroscopic and further promoted their restructuring at higher relative humidity (RH). The condensation of small amounts of TEG may induce a significant restructuring of atmospheric soot aggregates, altering their properties and atmospheric impacts.
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