Center for Environmental Research & Technology

Sanghee Han | Ph.D. Candidate, Packard Postdoctoral Fellowship, University of California, Riverside

Lunch: 11:30 AM - 12:00 PM

Seminar: 12:00 PM - 1:00 PM

Location: Hybrid; RM 105 and Zoom ( Join Zoom Meeting; ID: 92218069308; Passcode: 568748)

Title: "Experimental Investigation of Aerosol Physicochemical Properties"

Abstract: Secondary organic aerosol (SOA) represents a substantial portion of atmospheric nanoparticles. Their formation and growth, driven by various oxidation pathways of precursor compounds under different environmental conditions, lead to a wide range of physicochemical properties. Among these, particle deliquescence and aerosol water uptake are important to understanding SOA behavior. However, accurately characterizing these properties remains challenging, particularly due to difficulties in controlling relative humidity throughout the entire measurement process. In this presentation, I will introduce (1) the influence of oxidation pathways and environmental conditions on the aerosol physicochemical properties, using results from chamber studies and a SOA model, and (2) a new method, using a temperature-controlled bipolar charge conditioner to characterize deliquescence and particle hygroscopic growth. This setup is possibly used to characterize the deliquescence relative humidity and estimate the aerosol water content, offering insights into phase transitions under well-controlled environmental conditions.

Bio: Sanghee joined the Markus Lab as a postdoctoral scholar in January 2025. She earned her Ph.D. in 2022 from the University of Florida, where she focused on predicting secondary organic aerosol formation from the multiphase reactions of hydrocarbons. Following her Ph.D., she conducted postdoctoral research at UC San Diego, contributing to the EPCAPE field campaign as she shifted her focus toward field measurements. She completed her bachelor’s degree (2015) and master’s degree (2017) in environmental science and engineering from Ewha Womans University, Seoul, Korea.