Effects of amines on formation of sub-3 nm particles and their subsequent growth

Details Effects of amines on formation of sub-3 nm particles and their subsequent growth Effects of amines on formation of sub-3 nm particles and their subsequent growth

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012georl..3902807y&link_type=abstract

Geophysical Research Letters, Volume 39, Issue 2, CiteID L02807

Physics

1

Atmospheric Composition And Structure: Aerosols And Particles (0345, 4801, 4906), Atmospheric Composition And Structure: Chemical Kinetic And Photochemical Properties, Atmospheric Composition And Structure: Cloud Physics And Chemistry, Atmospheric Composition And Structure: Pollution: Urban And Regional (0305, 0478, 4251, 4325), Atmospheric Composition And Structure: Troposphere: Composition And Chemistry

Scientific paper

Field observations and quantum chemical calculations suggest that amines can be important for formation of nanometer size particles. Amines and ammonia often have common atmospheric emission sources and the similar chemical and physical properties. While the effects of ammonia on aerosol nucleation have been previously investigated, laboratory studies of homogeneous nucleation involving amines are lacking. We have made kinetics studies of multicomponent nucleation (MCN) with sulfuric acid, water, ammonia and amines under conditions relevant to the atmosphere. Low concentrations of aerosol precursors were measured with chemical ionization mass spectrometers (CIMS) to provide constrained precursor concentrations needed for nucleation. Particle sizes larger than ˜2 nm were measured with a nano-differential mobility analyzer (nano-DMA), and number concentrations of particles larger than ˜1 nm were measured with a particle size magnifier (PSM). Our observations provide the laboratory evidence that amines indeed can participate in aerosol nucleation and growth at the molecular cluster level. The enhancement of particle number concentrations due to several atmospherically relevant amine compounds and ammonia were related to the basicity of these compounds, indicating that acid-base reactions may contribute to the formation of sub-3 nm particles.

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