Online shape and density measurement of single aerosol particles

Wang，Shurong1; Zhou，Kaili1; Lu，Xiaohui1; Chen，Hong1; Yang，Fan2; Li，Qiang3; Chen，Jianmin1; Prather，Kimberly A.4; Yang，Xin1,5,6; Wang，Xiaofei1,5

2022

10.1016/j.jaerosci.2021.105880

JOURNAL OF AEROSOL SCIENCE   影响因子和分区

0021-8502

1879-1964

Aerosols play crucial roles in affecting air quality, climate and human health. Particle morphology and density would provide critical information on the chemical composition, mixing state and aging process of particles. Many investigations used dynamic shape factor (χ) to quantify particle shape. However, the measurement for χ often requires the knowledge of particle density, which is usually not readily available for atmospheric aerosols. Besides, χ is not a pure geometric descriptor, as it is also dependent on Knudsen number (K). Here, a method, consisting of an aerodynamic aerosol classifier (AAC, aerodynamic particle diameter, D, measurement), a differential mobility analyzer (DMA, electrical mobility particle diameter, D, measurement) and a single particle aerosol mass spectrometer (SPAMS, vacuum aerodynamic particle diameter, D, measurement), was developed to investigate two geometric descriptors that are solely dependent on particle geometry: the orientationally averaged projected area (A) and the hydrodynamic radius (R). The shape indicator, S, was defined as the square root of the ratio A/πR. To test the performance of the AAC-DMA-SPAMS system, the S and χ of 9 types of laboratory-generated particles with known density were measured with this system, and the quantitative relationship between χ (1<χ<1.05) and S (1

Aerodynamic diameter Density Electrical mobility diameter Shape factor Shape indicator Vacuum aerodynamic diameter

SCI ; EI

英语

通讯

National Natural Science Foundation of China[21906024,42077193,91544224,41775150,41827804] ; Natural Science Foundation of Shanghai[19ZR1404000]

Engineering ; Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences

Engineering, Chemical ; Engineering, Mechanical ; Environmental Sciences ; Meteorology & Atmospheric Sciences

WOS:000711825100003

ELSEVIER SCI LTD

20214111001033

Aerodynamics ; Air quality ; Atmospheric aerosols ; Atmospheric thermodynamics ; Geometry ; Mixing

Atmospheric Properties:443.1 ; Air Pollution Control:451.2 ; Thermodynamics:641.1 ; Aerodynamics, General:651.1 ; Chemical Operations:802.3 ; Mathematics:921

CHEMISTRY

2-s2.0-85116574685

Scopus

1.Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention,Department of Environmental Science and Engineering,Fudan University,Shanghai,200433,China
2.Environmental Monitoring Station of Pudong New District,Shanghai,200135,China
3.Cambustion Ltd.,Cambridge,CB1 8DH,United Kingdom
4.Scripps Institution of Oceanography,University of California,La Jolla,San Diego,92037,United States
5.Shanghai Institute of Pollution Control and Ecological Security,Shanghai,200092,China
6.School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China

Wang，Shurong,Zhou，Kaili,Lu，Xiaohui,et al. Online shape and density measurement of single aerosol particles[J]. JOURNAL OF AEROSOL SCIENCE,2022,159.

Wang，Shurong.,Zhou，Kaili.,Lu，Xiaohui.,Chen，Hong.,Yang，Fan.,...&Wang，Xiaofei.(2022).Online shape and density measurement of single aerosol particles.JOURNAL OF AEROSOL SCIENCE,159.

Wang，Shurong,et al."Online shape and density measurement of single aerosol particles".JOURNAL OF AEROSOL SCIENCE 159(2022).