Aqueous-phase reaction and phase state of particles
Chemical reactions in atmospheric particulate matter (PM) affect air quality and global climate, as well as the transport of iron from inland areas to the ocean. The transformation of particle phase state from liquid, solid and semi-solid can alter the extent of those reactions and affect the kinetics. We simulate those chemical reactions using a number of reactors such as an oxidative flow reactor, aqueous-phase reactor, as well as single levitated particle by an electrodynamic balance. The simulated results can provide information about reaction mechanisms and chemical kinetics, which are essential for incorporating those processes in chemical transport models.
- Li, J.; Liu, Q.; Li, Y. J.*; Liu, T.; Huang, D.; Zheng, J.; Zhu, W.; Hu, M.; Wu, Y.; Lou, S.; Hallquist, Å. M.; Hallquist, M.; Chan, C. K.; Canonaco, F.; Prévôt, A. S. H.; Fung, J. C. H.; Lau, A. K. H.; Yu, J. Z.*, Characterization of Aerosol Aging Potentials at Suburban Sites in Northern and Southern China Utilizing a Potential Aerosol Mass (Go:PAM) Reactor and an Aerosol Mass Spectrometer. Geophys. Res. Atmos., 2019, 124: 5629-5649.
- Li Y.J.; Liu P.F.; Gong Z.H.; Wang Y.; Bateman A.P.; Bergoend C.; Bertram A.K.*; Martin S.T.*, Chemical reactivity and liquid/nonliquid states of secondary organic material, Sci. Technol., 2015, 49: 13264-13274.
- Li Y.J.; Huang D.D.; Cheung H.Y.; Lee A.K.Y.; Chan C.K.*, Aqueous-phase photochemical oxidation and direct photolysis of vanillin—a model compound of methoxy-phenols from biomass burning, Atmos. Chem. Phys., 2014, 14: 2871-2885.
Mass transport and chemical reaction at the water-air interface
The surface characteristics and chemical processes at the ocean-atmosphere interface are essential in the mass flux between these two spheres in the environment. We study the interfacial mass transport and chemical reactions using laboratory simulations and field observations. The results obtained will be useful in our understanding on the impact of material transport at the ocean-atmosphere interface on regional quality in coastal areas, as well as on global climate.
- Gen, M.; Zhang, R.; Huang, D. D.; Li, Y. J.; Chan, C. K., Heterogeneous Oxidation of SO2 in Sulfate Production during Nitrate Photolysis at 300 nm: Effect of pH, Relative Humidity, Irradiation Intensity, and the Presence of Organic Compounds. Sci. Technol., 2019, 53: 8757-8766.
- Gen, M.; Zhang, R.; Huang, D. D.; Li, Y. J.; Chan, C. K., Heterogeneous SO2 Oxidation in Sulfate Formation by Photolysis of Particulate Nitrate. Sci. Tech. Let., 2019, 6: 86-91.
- Li, Y. J.; Liu, P. F.; Bergoend, C.; Bateman, A. P.; Martin, S. T., Rebounding hygroscopic inorganic aerosol particles: Liquids, gels, and hydrates. Aerosol Sci. Technol., 2017, 51: 388-396.