Comparison of Approaches for Measuring and Predicting the Viscosity of Ternary Component Aerosol Particles

Grazia Rovelli, Young Chul Song, Adrian M. MacLean, David O. Topping, Allan K. Bertram, Jonathan P. Reid

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Measurements of the water activity-dependent viscosity of aerosol particles from two techniques are compared, specifically from the coalescence of two droplets in holographic optical tweezers (HOT) and poke-and-flow experiments on particles deposited onto a glass substrate. These new data are also compared with the fitting of dimer coagulation, isolation, and coalescence (DCIC) measurements. The aerosol system considered in this work are ternary mixtures of sucrose-citric acid-water and sucrose-NaNO 3 -water, at varying solute mass ratios. Results from HOT and poke-and-flow are in excellent agreement over their overlapping range of applicability (â10 3 -10 7 Pa s); fitted curves from DCIC data show variable agreement with the other two techniques because of the sensitivity of the applied modeling framework to the representation of water content in the particles. Further, two modeling approaches for the predictions of the water activity-dependent viscosity of these ternary systems are evaluated. We show that it is possible to represent their viscosity with relatively simple mixing rules applied to the subcooled viscosity values of each component or to the viscosity of the corresponding binary mixtures.

    Original languageEnglish
    Pages (from-to)5074-5082
    Number of pages9
    JournalAnalytical Chemistry
    Volume91
    Issue number8
    Early online date28 Mar 2019
    DOIs
    Publication statusPublished - 16 Apr 2019

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