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Estimating viscosity of individual substrate-deposited particles from measurements of their height-to-width ratios

Journal Article · · Aerosol Science and Technology
 [1];  [2];  [3];  [4];  [5];  [6];  [1]
  1. Purdue Univ., West Lafayette, IN (United States)
  2. Purdue Univ., West Lafayette, IN (United States); NASA Ames Research Center (ARC), Moffett Field, Mountain View, CA (United States)
  3. Fraund Consulting, Pleasant Hill, CA (United States)
  4. Purdue Univ., West Lafayette, IN (United States); Columbia Univ., New York, NY (United States)
  5. Russian Academy of Sciences (RAS), St. Petersburg (Russian Federation)
  6. Sonoma Technology Inc., Petaluma, CA (United States)
Airborne particles alter the radiative forcing of climate and have further consequences on air visibility, atmospheric chemistry, and human health. Recent studies reported the existence of highly viscous semisolid and even solid amorphous organic aerosol (OA) particles. Particle viscosity has an impact on the heterogeneous chemistry, gas-particle partitioning, and ice nucleation properties. Consequently, variations in particle viscosity must be considered when predicting the atmospheric impact of OA. Here, in this work, we use scanning electron microscopy (SEM) and scanning transmission X-ray microscopy (STXM) to estimate the viscosity of individual particles deposited on substrates based on their characteristic height-to-width ratios, which are affected by changes in morphology upon deposition. The height-to-width ratios obtained from SEM and STXM exhibit a strong correlation, demonstrating that both imaging approaches can be applied separately for viscosity assessment of the substrate-deposited particles. While these metrics are largely qualitative, this method enables rapid assessment of particle viscosity ranges, distinguishing between semisolid (>1010 Pa·s), viscous (104–108 Pa·s), and liquid (10°–101 Pa·s) particles within ensembles of ambient particles collected for microscopy studies.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). ARM Data Center; Purdue University, West Lafayette, IN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Contributing Organization:
Argonne National Laboratory (ANL); Brookhaven National Laboratory (BNL); Oak Ridge National Laboratory (ORNL); Pacific Northwest National Laboratory (PNNL)
Grant/Contract Number:
SC0021977
OSTI ID:
2203047
Alternate ID(s):
OSTI ID: 2332724
Journal Information:
Aerosol Science and Technology, Journal Name: Aerosol Science and Technology Journal Issue: 4 Vol. 58; ISSN 0278-6826
Publisher:
Taylor & FrancisCopyright Statement
Country of Publication:
United States
Language:
English

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