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Title: Changing shapes and implied viscosities of suspended submicron particles
Authors: Zhang, Y.
Sanchez, M. S.
Douet, C.
Wang, Y.
Bateman, A. P.
Gong, Z.
Kuwata, Mikinori
Renbaum-Wolff, L.
Sato, B. B.
Liu, P. F.
Bertram, A. K.
Geiger, F. M.
Martin, S. T.
Issue Date: 2015
Source: Zhang, Y., Sanchez, M. S., Douet, C., Wang, Y., Bateman, A. P., Gong, Z., et al. (2015). Changing shapes and implied viscosities of suspended submicron particles. Atmospheric Chemistry and Physics, 15(14), 7819-7829.
Series/Report no.: Atmospheric Chemistry and Physics
Abstract: The change in shape of atmospherically relevant organic particles is used to estimate the viscosity of the particle material without the need for removal from aerosol suspension. The dynamic shape factors χ of particles produced by α-pinene ozonolysis in a flow tube reactor, under conditions of particle coagulation, were measured while altering the relative humidity (RH) downstream of the flow tube. As relative humidity was increased, the results showed that χ could change from 1.27 to 1.02, corresponding to a transition from aspherical to nearly spherical shapes. The shape change could occur at elevated RH because the organic material had decreased viscosity and was therefore able to flow to form spherical shapes, as favored by the minimization of surface area. Numerical modeling was used to estimate the particle viscosity associated with this flow. Based on particle diameter and RH exposure time, the viscosity dropped from 10(8.7±2.0) to 10(7.0±2.0) Pa s (two sigma) for an increase in RH from < 5 to 58 % at 293 K. These results imply that the equilibration of the chemical composition of the particle phase with the gas phase can shift from hours at mid-range RH to days at low RH.
ISSN: 1680-7324
DOI: 10.5194/acp-15-7819-2015
Schools: School of Physical and Mathematical Sciences 
Research Centres: Earth Observatory of Singapore 
Rights: © Author(s) 2015. This work is distributed under the Creative Commons Attribution 3.0 License.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:EOS Journal Articles
SPMS Journal Articles

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