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| Titel |
Sub-3 nm particle size and composition dependent response of a nano-CPC battery |
| VerfasserIn |
J. Kangasluoma, C. Kuang, D. Wimmer, M. P. Rissanen, K. Lehtipalo, M. Ehn, D. R. Worsnop, J. Wang, M. Kulmala  , T. Petäjä |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 7, no. 3 ; Nr. 7, no. 3 (2014-03-04), S.689-700 |
| Datensatznummer |
250115641
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| Publikation (Nr.) |
 copernicus.org/amt-7-689-2014.pdf |
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| Zusammenfassung |
| In this study we built a nano-CPC (condensation particle counter) battery, consisting of four ultrafine CPCs
optimized for the detection of sub-3 nm particles. Two of the CPCs use
diethylene glycol as a working fluid: a laminar type diethlylene glycol CPC
and a mixing type Airmodus A09 particle size magnifier. The other two CPCs
are a laminar type TSI 3025A and a TSI 3786 with butanol and water as the
working fluids, respectively. The nano-CPC battery was calibrated with seven
different test aerosols: tetraheptyl ammonium bromide, ammonium sulfate,
sodium chloride, tungsten oxide, sucrose, candle flame products and limonene
ozonolysis products. The results show that ammonium sulfate and sodium
chloride have a higher activation efficiency with the water-based 3786 than
with the butanol-based 3025A, whereas the other aerosols were activated
better with butanol than with water as the working fluid. It is worthwhile
to mention that sub-2 nm limonene ozonolysis products were detected very
poorly with all of the CPCs, butanol being the best fluid to activate the
oxidation products. To explore how the detection efficiency is affected if
the aerosol is an internal mixture of two different chemical substances, we
made the first attempt to control the mixing state of sub-3 nm laboratory
generated aerosol. We show that we generated an internally mixed aerosol of
ammonium sulfate nucleated onto tungsten oxide seed particles, and observed
that the activation efficiency of the internally mixed clusters was a
function of the internal mixture composition. |
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