Characterization of iodine particles with Volatilization-Humidification Tandem Differential Mobility Analyser (VH-TDMA), Raman and SEM techniques
Item
Title (Dublin Core)
Characterization of iodine particles with Volatilization-Humidification Tandem Differential Mobility Analyser (VH-TDMA), Raman and SEM techniques
Description (Dublin Core)
Particles formed upon photo-oxidation of CH<sub>2</sub>I<sub>2</sub> and particles of I<sub>2</sub>O<sub>5</sub> and HIO<sub>3</sub> have been studied using a Volatilisation and Humidification Tandem Differential Mobility Analyser (VH-TDMA) system. Volatilization and hygroscopic behaviour have been investigated as function of temperature (from 25 to 400°C), humidity (RH from 80 to 98%), initial aerosol sizes (from 27 to 100 nm mobility diameter) and in nitrogen or air as the sheath gasses. The volatility behaviour of particles formed upon photo-oxidation of CH<sub>2</sub>I<sub>2</sub> is more similar to that of HIO<sub>3</sub> particles in a filtered sheath air than in nitrogen, with the particle shrinkage occurring at 190°C and accompanied by hygroscopic growth. Despite its high solubility, HIO<sub>3</sub> was found not to be hygroscopic at room temperature with no significant growth displayed until the thermodenuder temperature reached 200°C or above when the particles have transformed into I<sub>2</sub>O<sub>5</sub>. Diiodopentaoxide (I<sub>2</sub>O<sub>5</sub>) particles exhibit relatively low hygroscopic growth factors of 1.2–2 in the humidity range investigated. Scanning Electron Microscopy (SEM) of particles formed upon photo-oxidation of CH<sub>2</sub>I<sub>2</sub> shows that their primary elemental components were iodine and oxygen in a stoichiometric ratio of approximately 1:2 with 10% error. Both Raman spectra and SEM show poor crystallinity for all the aerosols produced.
Creator (Dublin Core)
Ristovski, Z. D.
Fletcher, C.
D’Anna, B.
Johnson, G. R.
Bostrom, J. T.
Date (Dublin Core)
2018-08-09
Type (Dublin Core)
Text
Format (Dublin Core)
application/pdf
Identifier (Dublin Core)
10.5194/acpd-6-1481-2006
https://acp.copernicus.org/preprints/acpd-2005-0426/
Source (Dublin Core)
eISSN: 1680-7324
Language (Dublin Core)
eng
