Ariel View of Islands

AEROSOL SCIENCE

&

AIR POLLUTION

 
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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

Masao Gen, Ruifeng Zhang, Dan Dan Huang, Yongjie Li, and Chak K. Chan

 
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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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NEWS AND UPDATES

 

For older news and updates, please click the following button

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𝐈𝐧𝐚𝐜𝐭𝐢𝐯𝐚𝐭𝐢𝐨𝐧 𝐨𝐟 𝐄𝐬𝐜𝐡𝐞𝐫𝐢𝐜𝐡𝐢𝐚 𝐜𝐨𝐥𝐢 𝐢𝐧 𝐝𝐫𝐨𝐩𝐥𝐞𝐭𝐬 𝐚𝐭 𝐝𝐢𝐟𝐟𝐞𝐫𝐞𝐧𝐭 𝐚𝐦𝐛𝐢𝐞𝐧𝐭 𝐫𝐞𝐥𝐚𝐭𝐢𝐯𝐞 𝐡𝐮𝐦𝐢𝐝𝐢𝐭𝐢𝐞𝐬: 𝐄𝐟𝐟𝐞𝐜𝐭𝐬 𝐨𝐟 𝐩𝐡𝐚𝐬𝐞 𝐭𝐫𝐚𝐧𝐬𝐢𝐭𝐢𝐨𝐧, 𝐬𝐨𝐥𝐮𝐭𝐞 𝐚𝐧𝐝 𝐜𝐞𝐥𝐥 𝐜𝐨𝐧𝐜𝐞𝐧𝐭𝐫𝐚𝐭𝐢𝐨𝐧𝐬
𝑍ℎ𝑎𝑛𝑐𝑜𝑛𝑔 𝐿𝑖𝑎𝑛𝑔, 𝑊𝑖𝑛𝑔 𝐿𝑎𝑚 𝐶ℎ𝑎𝑛, 𝑋𝑖𝑎𝑜𝑚𝑒𝑛𝑔 𝑇𝑖𝑎𝑛, 𝐴𝑙𝑣𝑖𝑛 𝐶.𝐾. 𝐿𝑎𝑖, 𝑃𝑎𝑡𝑟𝑖𝑐𝑘 𝐾.𝐻. 𝐿𝑒𝑒, 𝐶ℎ𝑎𝑘 𝐾. 𝐶ℎ𝑎𝑛

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 𝐃𝐫. 𝐏𝐚𝐭𝐫𝐢𝐜𝐤 𝐋𝐞𝐞 (𝐒𝐄𝐄) 𝐚𝐧𝐝 𝐏𝐫𝐨𝐟. 𝐀𝐥𝐯𝐢𝐧 𝐋𝐚𝐢 (𝐀𝐂𝐄) 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. 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.

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SELECTED NEW PUBLICATIONS

 
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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

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NITRITE/NITROUS ACID GENERATION FROM THE REACTION OF NITRATE AND FE(II) PROMOTED BY PHOTOLYSIS OF IRON–ORGANIC COMPLEXES

Environmental Science & Technology (2021)

Masao Gen, Ruifeng Zhang, and Chak Chan

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EMISSIONS AND SECONDARY FORMATION OF AIR POLLUTANTS FROM MODERN HEAVY-DUTY TRUCKS IN REAL-WORLD TRAFFIC—CHEMICAL 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 Åsa M. Hallquist

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PRIMARY EMISSIONS AND SECONDARY PRODUCTION OF ORGANIC AEROSOLS FROM HEATED ANIMAL FATS

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NITRATE PHOTOLYSIS IN MIXED SUCROSE–NITRATE–SULFATE 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 G

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

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CONCLUDING REMARKS: FARADAY DISCUSSION ON AIR QUALITY IN MEGACITIES

Faraday Discussions

Masao Gen, Liyuan Zhou, Ruifeng Zhang and Chak K. Chan

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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

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ENHANCED SULFATE PRODUCTION BY NITRATE PHOTOLYSIS IN THE PRESENCE OF HALIDE IONS IN ATMOSPHERIC PARTICLES

Environmental Science and Technology

Ruifeng ZHANG et al. (2020)

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PHD STUDENTS

 
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BEATRIX ROSETTE GO MABATO

PhD Student in Energy and Environment

MSc and BSc in Chemistry, University of Santo Tomas (Manila, PH)


Set currently focuses on the field of aerosol chemistry and air pollution. Among Set’s research interests are aerosol uptake experiments, brown carbon formation, and atmospheric aging processes.

Image by Kamen Atanassov

ASSISTANT

 

JO JO

Emotional Support Specialist

Joined in April 2019

7-8 years old

Specializing in emotional support

Adopted from House of Joy and Mercy (阿棍屋), Yuen Long, Hong Kong

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Seagulls

PREVIOUS MEMBERS

 
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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)