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Near-Unity Mass Accommodation Coefficient of Organic Molecules of Varying Structure

Autor(en)

Jan Julin, Paul M. Winkler, Neil M. Donahue, Paul E. Wagner, Ilona Riipinen

Abstrakt

Atmospheric aerosol particles have a significant effect on global

climate, air quality, and consequently human health. Condensation of

organic vapors is a key process in the growth of nanometer-sized

particles to climate relevant sizes. This growth is very sensitive to

the mass accommodation coefficient α, a quantity describing the vapor

uptake ability of the particles, but knowledge on α of atmospheric

organics is lacking. In this work, we have determined α for four organic

molecules with diverse structural properties: adipic acid, succinic

acid, naphthalene, and nonane. The coefficients are studied using

molecular dynamics simulations, complemented with expansion chamber

measurements. Our results are consistent with α = 1 (indicating nearly

perfect accommodation), regardless of the molecular structural

properties, the phase state of the bulk condensed phase, or surface

curvature. The results highlight the need for experimental techniques

capable of resolving the internal structure of nanoparticles to better

constrain the accommodation of atmospheric organics.

Organisation(en)

Aerosolphysik und Umweltphysik

Externe Organisation(en)

Stockholm University, Carnegie Mellon University, University of Helsinki

Journal

Environmental Science & Technology

Band

Seiten

12083-12089

Anzahl der Seiten

ISSN

0013-936X

DOI

https://doi.org/10.1021/es501816h

Publikationsdatum

10-2014

Peer-reviewed

ÖFOS 2012

105904 Umweltforschung, 103039 Aerosolphysik, 103008 Experimentalphysik

ASJC Scopus Sachgebiete

Allgemeine Chemie, Environmental Chemistry

Sustainable Development Goals

SDG 13 – Maßnahmen zum Klimaschutz, SDG 3 – Gesundheit und Wohlergehen

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