Preprints
https://doi.org/10.5194/acp-2021-110
https://doi.org/10.5194/acp-2021-110

  22 Feb 2021

22 Feb 2021

Review status: this preprint is currently under review for the journal ACP.

Viscosity and phase state of aerosol particles consisting of sucrose mixed with inorganic salts

Young-Chul Song1,2, Joseph Lilek3, Jae Bong Lee4, Man Nin Chan5,6, Zhijun Wu7, Andreas Zuend3, and Mijung Song1,2,8 Young-Chul Song et al.
  • 1Department of Earth and Environmental Sciences, Jeonbuk National University, Republic of Korea
  • 2The Earth and Environmental Science System Research Center, Jeonbuk National University, Republic of Korea
  • 3Department of Atmospheric and Oceanic Sciences, McGill University, Montréal, Quebec, Canada
  • 4Inovative System Safety Research Division, Korea Atomic Energy Research Institute, Republic of Korea
  • 5Earth System Science Programme, Faculty of Science, The Chinese University of Hong Kong, Hong Kong, China
  • 6The Institute of Environment, Energy, and Sustainability, The Chinese University of Hong Kong, Hong Kong, China
  • 7Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China
  • 8Department of Environment and Energy, Jeonbuk National University, Republic of Korea

Abstract. Research on the viscosity and phase state of aerosol particles is essential because of their significant influence on the particle growth rate, equilibration times and related evolution of mass concentration as well as heterogeneous reactions. So far, most studies of viscosity and phase state have been focused on organic aerosol particles, yet data on how viscosity can vary when the organic materials are mixed with inorganic salts remain scarce. Herein, using a bead-mobility and a poke-and-flow technique, we quantified viscosities at 293 ± 1 K for binary mixtures of organic material/H2O and inorganic salts/H2O, as well as ternary mixtures of organic material/inorganic salts/H2O over the atmospheric relative humidity (RH) range. Sucrose as the organic species, and calcium nitrate (Ca(NO3)2) or magnesium nitrate (Mg(NO3)2) as the inorganic salts were examined. For binary sucrose/H2O particles, the viscosities gradually increased from ~3 × 10−2 to > ~1 × 108 Pa s as RH decreased from ~75 % to ~25 %. Compared with the results for the sucrose/H2O particles, binary Ca(NO3)2/H2O and Mg(NO3)2/H2O particles showed drastic enhancements to > ~1 × 108 Pa s at low RH close to the efflorescence RH. For ternary mixtures of sucrose/Ca(NO3)2/H2O or sucrose/Mg(NO3)2/H2O, with organic-to-inorganic mass ratios of 1 : 1, the viscosities of the particles gradually increased from ~3 × 10−2 to greater than ~1 × 108 Pa s for RH values from ~75 % to ~5 %. Compared to the viscosities of the Ca(NO3)2/H2O particles, higher viscosities were observed for the ternary sucrose/Ca(NO3)2/H2O particles, with values increased by about 1 order of magnitude at 50 % RH and about 6 orders of magnitude at 35 % RH. Moreover, we applied a thermodynamics-based group-contribution model, AIOMFAC-VISC, to predict aerosol viscosities for the studied systems. The model predictions and viscosity measurements show good agreement within ~ 1 order of magnitude in viscosity. The viscosity measurements indicate that the studied mixed organic–inorganic particles range in phase state from liquid to semi-solid or even solid across the atmospheric RH range at a temperature of 293 K. These results support our understanding that organic/inorganic/H2O particles can exist in a liquid, semisolid, or even a solid state in the troposphere.

Young-Chul Song et al.

Status: open (until 19 Apr 2021)

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Young-Chul Song et al.

Young-Chul Song et al.

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Short summary
We report viscosity of binary mixtures of organic material/H2O and inorganic salts/H2O, as well as ternary mixtures of organic material/inorganic salts/H2O over the atmospheric relative humidity (RH) range. The viscosity measurements indicate that the studied mixed organic–inorganic particles range in phase state from liquid to semi-solid or even solid across the atmospheric RH range at a temperature of 293 K.
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