title: Size matters in the water uptake and hygroscopic growth of atmospherically relevant multicomponent aerosol particles.
abstract: Understanding the interactions of water with atmospheric aerosols is crucial for determining the size, physical state, reactivity, and climate impacts of this important component of the Earth's atmosphere. Here we show that water uptake and hygroscopic growth of multicomponent, atmospherically relevant particles can be size dependent when comparing 100 nm versus ca. 6 μm sized particles. It was determined that particles composed of ammonium sulfate with succinic acid and of a mixture of chlorides typical of the marine environment show size-dependent hygroscopic behavior. Microscopic analysis of the distribution of components within the aerosol particles show that the size dependence is due to differences in the mixing state, that is, whether particles are homogeneously mixed or phase separated, for different sized particles. This morphology-dependent hygroscopicity has consequences for heterogeneous atmospheric chemistry as well as aerosol interactions with electromagnetic radiation and clouds.
authors.affiliation: †Department of Chemistry, and ‡Department of Chemical and Biochemical Engineering, University of Iowa, Iowa City, Iowa 52242, United States.
authors.forename: Olga
authors.initials: O
authors.lastname: Laskina
authors.affiliation: †Department of Chemistry, and ‡Department of Chemical and Biochemical Engineering, University of Iowa, Iowa City, Iowa 52242, United States.
authors.forename: Holly S
authors.initials: HS
authors.lastname: Morris
authors.affiliation: †Department of Chemistry, and ‡Department of Chemical and Biochemical Engineering, University of Iowa, Iowa City, Iowa 52242, United States.
authors.forename: Joshua R
authors.initials: JR
authors.lastname: Grandquist
authors.affiliation: †Department of Chemistry, and ‡Department of Chemical and Biochemical Engineering, University of Iowa, Iowa City, Iowa 52242, United States.
authors.forename: Zhen
authors.initials: Z
authors.lastname: Qin
authors.affiliation: †Department of Chemistry, and ‡Department of Chemical and Biochemical Engineering, University of Iowa, Iowa City, Iowa 52242, United States.
authors.forename: Elizabeth A
authors.initials: EA
authors.lastname: Stone
authors.affiliation: †Department of Chemistry, and ‡Department of Chemical and Biochemical Engineering, University of Iowa, Iowa City, Iowa 52242, United States.
authors.forename: Alexei V
authors.initials: AV
authors.lastname: Tivanski
authors.affiliation: †Department of Chemistry, and ‡Department of Chemical and Biochemical Engineering, University of Iowa, Iowa City, Iowa 52242, United States.
authors.forename: Vicki H
authors.initials: VH
authors.lastname: Grassian
mesh_terms: D000272:Adipates / Q000737:chemistry; D000336:Aerosols / Q000737:chemistry*; D000645:Ammonium Sulfate / Q000737:chemistry; D001272:Atmosphere / Q000737:chemistry*; D002712:Chlorides / Q000737:chemistry; D008314:Malonates / Q000737:chemistry; D018625:Microscopy, Atomic Force; D008855:Microscopy, Electron, Scanning; D010316:Particle Size; D012965:Sodium Chloride / Q000737:chemistry; D013059:Spectrum Analysis, Raman; D019802:Succinic Acid / Q000737:chemistry; D014867:Water / Q000737:chemistry*; D017155:Wettability
chemical_list: D000272:Adipates; D000336:Aerosols; D002712:Chlorides; D008314:Malonates; D014867:Water; D012965:Sodium Chloride; C029900:adipic acid; C030290:malonic acid; D019802:Succinic Acid; D000645:Ammonium Sulfate