Wet and dry sizes of atmospheric aerosol particles: An AFM-TEM study

Details Wet and dry sizes of atmospheric aerosol particles: An AFM-TEM study Wet and dry sizes of atmospheric aerosol particles: An AFM-TEM study

Jun 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998georl..25.1907p&link_type=abstract

Geophysical Research Letters, Volume 25, Issue 11, p. 1907-1910

Physics

27

Atmospheric Composition And Structure: Middle Atmosphere-Constituent Transport And Chemistry, Atmospheric Composition And Structure: Instruments And Techniques, Atmospheric Composition And Structure: Pressure, Density, And Temperature

Scientific paper

We studied the hygroscopic behavior of atmospheric aerosols by using a novel approach, the combination of atomic force microscopy (AFM) with transmission electron microscopy (TEM) imaging of the same individual particles. By comparing the dimensions of hydrated and dry ammonium sulfate particles collected above the North Atlantic Ocean, we determined that particle volumes are up to four times larger under ambient conditions (as determined by AFM) than in the vacuum of a transmission electron microscope. We interpret these changes as resulting from the loss of water. Organic films on the particles may be responsible for the relatively large water uptake at low relative humidities.

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