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Thermal characterization of aminium nitrate nanoparticles.

Artikel i vetenskaplig tidskrift
Författare Kent Salo
Jonathan Westerlund
Patrik U Andersson
Claus Nielsen
Barbara D'Anna
Mattias Hallquist
Publicerad i The journal of physical chemistry. A
Volym 115
Nummer/häfte 42
Sidor 11671-7
ISSN 1520-5215
Publiceringsår 2011
Publicerad vid Institutionen för kemi
Sidor 11671-7
Språk en
Länkar dx.doi.org/10.1021/jp204957k
Ämneskategorier Kemi

Sammanfattning

Amines are widely used and originate from both anthropogenic and natural sources. Recently, there is, in addition, a raised concern about emissions of small amines formed as degradation products of the more complex amines used in CO(2) capture and storage systems. Amines are bases and can readily contribute to aerosol mass and number concentration via acid-base reactions but are also subject to gas phase oxidation forming secondary organic aerosols. To provide more insight into the atmospheric fate of the amines, this paper addresses the volatility properties of aminium nitrates suggested to be produced in the atmosphere from acid-base reactions of amines with nitric acid. The enthalpy of vaporization has been determined for the aminium nitrates of mono-, di-, trimethylamine, ethylamine, and monoethanolamine. The enthalpy of vaporization was determined from volatility measurements of laboratory generated aerosol nanoparticles using a volatility tandem differential mobility analyzer set up. The determined enthalpy of vaporization for aminium nitrates range from 54 up to 74 kJ mol(-1), and the calculated vapor pressures at 298 K are around 10(-4) Pa. These values indicate that aminium nitrates can take part in gas-to-particle partitioning at ambient conditions and have the potential to nucleate under high NO(x) conditions, e.g., in combustion plumes.

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