Preprints
https://doi.org/10.5194/acp-2022-74
https://doi.org/10.5194/acp-2022-74
 
07 Feb 2022
07 Feb 2022
Status: a revised version of this preprint is currently under review for the journal ACP.

Viscosity and physical state of sucrose mixed with ammonium sulfate droplets

Rani Jeong1, Joseph Lilek2, Andreas Zuend2, Rongshuang Xu3, Man Nin Chan3,4, Dohyun Kim1, Hi Gyu Moon5, and Mijung Song1,6 Rani Jeong et al.
  • 1Department of Environment and Energy, Jeonbuk National University, Republic of Korea
  • 2Department of Atmospheric and Oceanic Sciences, McGill University, Montréal, Quebec, Canada
  • 3Earth System Science Programme, Faculty of Science, The Chinese University of Hong Kong, Hong Kong, Hong Kong SAR, China
  • 4The Institute of Environment, Energy and Sustainability, The Chinese University of Hong Kong, Hong Kong, Hong Kong SAR, China
  • 5Center for Ecological Risk Assessment, Korea Institute of Toxicology (KIT), Jinju 52834, Republic of Korea
  • 6Department of Earth and Environmental Sciences, Jeonbuk National University, Republic of Korea

Abstract. Although knowledge of the physical state of aerosol particles is essential to understand atmospheric chemistry model and measurements, information on the viscosity and physical state of aerosol particles consisting of organic and inorganic salts are still rare. Herein, we quantified viscosities at 293 ± 1 K upon dehydration for the binary systems, sucrose/H2O and ammonium sulfate (AS)/H2O, and the ternary systems, sucrose/AS/H2O for organic-to-inorganic dry mass ratios (OIRs) = 4 : 1, 1 : 1, and 1 : 4. For binary systems, the viscosity of sucrose/H2O particles gradually increased from ~6 × 10−1 to > ~1 × 108 Pa‧s when the relative humidity (RH) decreased from ~83 % to ~24 %, which agrees with previous studies. The viscosity of AS/H2O particles remained in the liquid state (< 102 Pa‧s) for RH > ~50 %, and for RH ≤ ~50 %, the particles showed viscosity of > ~1 × 1012 Pa‧s, corresponding to a solid state. For ternary systems, the viscosity of organic-rich particles (OIR = 4 : 1) gradually increased from ~4 × 10−2 to ~1 × 108 Pa‧s for a RH decrease from ~80 % to ~18 %, similar to the sucrose/H2O particles. In the particles for OIR = 1 : 1, the viscosities ranged smaller than ~4 × 101 for RH > 34 %, and > ~1 × 108 Pa‧s at ~27 % RH. Compared to the organic-rich particles, in the inorganic-rich particles (OIR = 1 : 4), drastic enhancement in viscosity was observed as RH decreased; the viscosity enhanced approximately 8 orders of magnitude in RH from 43 % to 25 %. Based on viscosity data, all particles studied in this work were observed to exist as a liquid, semi-solid or solid depending on the RH. Furthermore, we compared the measured viscosities of ternary systems with OIRs of 4 : 1, 1 : 1, and 1 : 4 to the predicted viscosities using the Aerosol Inorganic–Organic Mixtures Functional groups Activity Coefficients Viscosity model (AIOMFAC-VISC) predictions with the Zdanovskii–Stokes–Robinson (ZSR)-style organic–inorganic mixing model, with excellent model–measurement agreement for all OIRs.

Rani Jeong et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2022-74', Anonymous Referee #1, 21 Feb 2022
  • RC2: 'Comment on acp-2022-74', Anonymous Referee #2, 27 Apr 2022

Rani Jeong et al.

Rani Jeong et al.

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Short summary
In this study, the viscosities of particles of sucrose/H2O, AS/H2O, and sucrose/AS/H2O for OIRs of 4 : 1, 1 : 1, and 1 : 4 for decreasing RH, were quantified by poke-and-flow techniques and bead-mobility at 293 ± 1 K. Based on the viscosity results, the particles of binary and ternary systems ranged from liquid to semisolid, and even the solid state depending on the RH. Moreover, we compared the measured viscosities of ternary systems to the predicted viscosities with excellent agreement.
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