DEAN OF SCHOOL OF ENERGY AND ENVIRONMENT
CHAIR PROFESSOR OF ATMOSPHERIC ENVIRONMENT
CITY UNIVERSITY OF HONG KONG
AEROSOL SCIENCE
&
AIR POLLUTION
BIOGRAPHY
Professor Chan obtained BSc in Chemical Engineering from the University of Texas at Austin in 1986 and PhD in Chemical Engineering from the California Institute of Technology in 1992. He is currently Dean and Chair Professor in School of Energy and Environment at City University of Hong Kong. Before that, he was at the Hong Kong University of Science and Technology.
Professor Chan has over 30 years of research experience in air pollution and aerosol science. He specializes in aerosol water uptake and phase transformation, gas-aerosol interactions, the formation of secondary aerosols in the atmosphere, and laser spectroscopy of aerosols.
Professor Chan received the Haagen Smit Award of Atmospheric Environment in 2015, Second Prize of the State Natural Science Award in 2010, and First Prize of the Natural Science Award in 2007. He was the first winner of the Asian Young Aerosol Scientists Award. He was an Editor-in-Chief of Atmospheric Environment in 2008-2019.
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BEST PAPER AWARD IN
ENVIRONMENTAL SCIENCE AND TECHNOLOGY LETTERS IN 2019
Heterogeneous SO2 Oxidation in Sulfate Formation by Photolysis of Particulate Nitrate
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Masao Gen, Ruifeng Zhang, Dan Dan Huang, Yongjie Li, and Chak K. Chan
We are very honored to receive this award and are grateful to the ESTL editors. We also like to thank the reviewers of the paper who have given us many insightful comments and suggestions.
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๐๐ง๐๐๐ญ๐ข๐ฏ๐๐ญ๐ข๐จ๐ง ๐จ๐ ๐๐ฌ๐๐ก๐๐ซ๐ข๐๐ก๐ข๐ ๐๐จ๐ฅ๐ข ๐ข๐ง ๐๐ซ๐จ๐ฉ๐ฅ๐๐ญ๐ฌ ๐๐ญ ๐๐ข๐๐๐๐ซ๐๐ง๐ญ ๐๐ฆ๐๐ข๐๐ง๐ญ ๐ซ๐๐ฅ๐๐ญ๐ข๐ฏ๐ ๐ก๐ฎ๐ฆ๐ข๐๐ข๐ญ๐ข๐๐ฌ: ๐๐๐๐๐๐ญ๐ฌ ๐จ๐ ๐ฉ๐ก๐๐ฌ๐ ๐ญ๐ซ๐๐ง๐ฌ๐ข๐ญ๐ข๐จ๐ง, ๐ฌ๐จ๐ฅ๐ฎ๐ญ๐ ๐๐ง๐ ๐๐๐ฅ๐ฅ ๐๐จ๐ง๐๐๐ง๐ญ๐ซ๐๐ญ๐ข๐จ๐ง๐ฌ
๐โ๐๐๐๐๐๐ ๐ฟ๐๐๐๐, ๐๐๐๐ ๐ฟ๐๐ ๐ถโ๐๐, ๐๐๐๐๐๐๐๐ ๐๐๐๐, ๐ด๐๐ฃ๐๐ ๐ถ.๐พ. ๐ฟ๐๐, ๐๐๐ก๐๐๐๐ ๐พ.๐ป. ๐ฟ๐๐, ๐ถโ๐๐ ๐พ. ๐ถโ๐๐
13 May 2022
This paper builds on our experience in the physical chemistry of solution droplets to study the inactivation of bioaerosols in artificial saliva droplets at different ambient relative humidities (RH). We collaborate with ๐๐ซ. ๐๐๐ญ๐ซ๐ข๐๐ค ๐๐๐ (๐๐๐) ๐๐ง๐ ๐๐ซ๐จ๐. ๐๐ฅ๐ฏ๐ข๐ง ๐๐๐ข (๐๐๐) as part of a Research Impact Fund project led by Alvin. Bacteria can be inactivated by increased osmotic stress and concentration of bactericidal substances at low RH. However, when the RH decreased to 50%, phase transition of the aqueous droplet, i.e., liquid to solid, occurred. The inactivation stopped because the effects of osmotic stresses and bactericidal substances no longer existed. Moderate relative humidity of ~60% affords the most effective inactivation of bacteria in droplets.ย In addition, high bacterial concentrations lowered the inactivation of bacteria, probably due to bacterial aggregation. The outer layers of bacteria could potentially shield the core bacteria from the osmotic stress and bactericidal effects.
SELECTED NEW PUBLICATIONS
PHOTOCHEMICAL REACTIONS OF GLYOXAL DURING PARTICULATE AMMONIUM NITRATE PHOTOLYSIS: BROWN CARBON FORMATION, ENHANCED GLYOXAL DECAY, AND ORGANIC PHASE FORMATION
Environmental Science & Technology
Ruifeng Zhang, Masao Gen, Zhancong Liang, Yong Jie Li, Chak K. Chan
NITRITE/NITROUS ACID GENERATION FROM THE REACTION OF NITRATE AND FE(II) PROMOTED BY PHOTOLYSIS OF IRONโORGANIC COMPLEXES
Environmental Science & Technology (2021)
Masao Gen, Ruifeng Zhang, and Chak Chan
EMISSIONS AND SECONDARY FORMATION OF AIR POLLUTANTS FROM MODERN HEAVY-DUTY TRUCKS IN REAL-WORLD TRAFFICโCHEMICAL CHARACTERISTICS USING ON-LINE MASS SPECTROMETRY
Environment science & technology (2021)
Liyuan Zhou, Christian M. Salvador, Michael Priestley, Mattias Hallquist, Qianyun Liu, Chak K. Chan, and ร
sa M. Hallquist
PRIMARY EMISSIONS AND SECONDARY PRODUCTION OF ORGANIC AEROSOLS FROM HEATED ANIMAL FATS
NITRATE PHOTOLYSIS IN MIXED SUCROSEโNITRATEโSULFATE PARTICLES AT DIFFERENT RELATIVE HUMIDITIES
The Journal of Physical Chemistry A
Zhancong Liang, Ruifeng Zhang, Masao Gen, Yangxi Chu, Chak K. Chan
PRODUCTION OF FORMATE VIA OXIDATION OF GLYOXAL PROMOTED BY PARTICULATE NITRATE PHOTOLYSIS
Environmental Science & Technology
Ruifeng Zhang, Masao Gen, Tzung-May Fu, Chak Keung Chan
CONCLUDING REMARKS: FARADAY DISCUSSION ON AIR QUALITY IN MEGACITIES
Faraday Discussions
Masao Gen,ย Liyuan Zhou,ย Ruifeng Zhangย andย Chak K. Chan
MULTIPHASE PHOTOCHEMISTRY OF IRON-CHLORIDE CONTAINING PARTICLES AS A
SOURCE OF AQUEOUS CHLORINE RADICALS AND ITS EFFECT ON SULFATE PRODUCTION
Environmental Science & Technology
Masao Gen, Ruifeng Zhang, Yong Jie Li, and Chak Keung Chan
ENHANCED SULFATE PRODUCTION BY NITRATE PHOTOLYSIS IN THE PRESENCE OF HALIDE IONS IN ATMOSPHERIC PARTICLES
Environmental Science and Technology
Ruifeng ZHANG et al. (2020)
PHD STUDENTS
BEATRIX ROSETTE GOย MABATO
PhD Student in Energy and Environment
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MSc and BSc in Chemistry, University of Santo Tomas (Manila, PH)
Set currently focuses on the field of aerosol chemistry and air pollution. Among Setโs research interests are aerosol uptake experiments, brown carbon formation, and atmospheric aging processes.
ASSISTANT
JO JO
Emotional Support Specialist
Joined in April 2019
7-8 years old
Specializing in emotional support
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Adopted from House of Joy and Mercy (้ฟๆฃๅฑ), Yuen Long, Hong Kong
PREVIOUS MEMBERS
DR. QIANYUN (CHERRIE) LIU
PhD in Environmental Science and Management, Hong Kong University of Science and Technology
Postdoctoral Fellow at CityU Hong Kong Shenzhen Research Institute (2019-2021)