Atmospheric Chemistry and Physics
www.atmos-chem-phys.net
1680-7316
1680-7324
6
12
2006
10.5194/acp-6-4633-2006
http://www.atmos-chem-phys.net/6/4633/2006/
http://www.atmos-chem-phys.net/6/4633/2006/acp-6-4633-2006.html
http://www.atmos-chem-phys.net/6/4633/2006/acp-6-4633-2006.pdf
4633
4642
2006-10-17
Prompt deliquescence and efflorescence of aerosol nanoparticles
G. Biskos
D. Paulsen
L. M. Russell
P. R. Buseck
S. T. Martin
scot_martin@harvard.edu
Division of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA
Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA 92093, USA
Departments of Geological Sciences and Chemistry/Biochemistry, Arizona State University, Tempe, AZ 85287, USA
Literature reports have differed on the possibilities of discontinuous and
continuous (i.e., prompt and nonprompt) deliquescence and efflorescence of
aerosol particles in the nanosize regime. Experiments reported herein using
a hygroscopic tandem nano-differential mobility analyzer demonstrate prompt
deliquescence and efflorescence of ammonium sulfate particles having
diameters from 6 to 60 nm. Apparent nonpromptness can be induced both by
operation of the experimental apparatus and by interpretation of the
measurements, even though the underlying phase transitions of individual
particles remain prompt. No nanosize effect on the relative humidity values
of deliquescence or efflorescence is observed for the studied size range.
Smaller hygroscopic growth factors are, however, observed for the
nanoparticles, in agreement with thermodynamic calculations that include the
Kelvin effect. A slightly nonspherical shape for dry ammonium sulfate
particles is inferred from their hygroscopically induced reconstruction
between 5 and 30% relative humidity. Our results provide a further
understanding of nanoparticle behavior, especially relevant to the growth
rates of atmospheric nanoparticles.
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