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Characterization of iodine particles with Volatilization-Humidification Tandem Differential Mobility Analyser (VH-TDMA), Raman and SEM techniques
Abstract. Particles formed upon photo-oxidation of CH2I2 and particles of I2O5 and HIO3 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 CH2I2 is more similar to that of HIO3 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, HIO3 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 I2O5. Diiodopentaoxide (I2O5) 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 CH2I2 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.
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RC S254: 'Iodine particle review', Anonymous Referee #2, 14 Mar 2006
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SC S511: 'iodine particle composition', Russell Saunders, 12 Apr 2006
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RC S558: 'Review of Ristovski et al.', Anonymous Referee #1, 17 Apr 2006
![Printer-friendly Version](https://www.atmospheric-chemistry-and-physics.net/print.gif)
![Supplement](https://www.atmospheric-chemistry-and-physics.net/supplement.gif)
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RC S254: 'Iodine particle review', Anonymous Referee #2, 14 Mar 2006
-
SC S511: 'iodine particle composition', Russell Saunders, 12 Apr 2006
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RC S558: 'Review of Ristovski et al.', Anonymous Referee #1, 17 Apr 2006
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Cited
9 citations as recorded by crossref.
- Analysis of the hygroscopic and volatile properties of ammonium sulphate seeded and unseeded SOA particles N. Meyer et al. 10.5194/acp-9-721-2009
- New particle formation and growth at a remote, sub-tropical coastal location R. Modini et al. 10.5194/acp-9-7607-2009
- Glass formation and unusual hygroscopic growth of iodic acid solution droplets with relevance for iodine mediated particle formation in the marine boundary layer B. Murray et al. 10.5194/acp-12-8575-2012
- Hygroscopic and volatile properties of marine aerosol observed at Cape Grim during the P2P campaign C. Fletcher et al. 10.1071/EN07011
- Modeling and sensitivity analysis of transport and deposition of radionuclides from the Fukushima Dai-ichi accident X. Hu et al. 10.5194/acp-14-11065-2014
- Computational study of the I2O5+ H2O = 2 HOIO2 gas-phase reaction S. Khanniche et al. 10.1016/j.cplett.2016.09.023
- Experimental and modelling studies of iodine oxide formation and aerosol behaviour relevant to nuclear reactor accidents S. Dickinson et al. 10.1016/j.anucene.2014.05.012
- Surface-catalyzed singlet oxygen production on iodine oxide films S. Lee et al. 10.1016/j.cplett.2008.12.077
- Modeling of Iodine Radiochemistry in the ASTEC Severe Accident Code: Description and Application to FPT-2 PHEBUS Test L. Bosland et al. 10.13182/NT10-A10774