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Experimental determination of the steady-state charging probabilities and particle size conservation in non-radioactive and radioactive bipolar aerosol chargers in the size range of 5-40 nm.

Kallinger P, Szymanski WW - J Nanopart Res (2015)

Bottom Line: For particular experimental conditions, some deviations from the chosen theoretical model were found for all chargers.For very small particle sizes, the AC-corona charger showed particle losses at low flow rates and did not reach steady-state charge equilibrium at high flow rates.Practically, excellent particle size conservation was found for all three chargers.

View Article: PubMed Central - PubMed

Affiliation: Faculty of Physics, University of Vienna, Boltzmanngasse 5, 1090 Vienna, Austria.

ABSTRACT

Three bipolar aerosol chargers, an AC-corona (Electrical Ionizer 1090, MSP Corp.), a soft X-ray (Advanced Aerosol Neutralizer 3087, TSI Inc.), and an α-radiation-based (241)Am charger (tapcon & analysesysteme), were investigated on their charging performance of airborne nanoparticles. The charging probabilities for negatively and positively charged particles and the particle size conservation were measured in the diameter range of 5-40 nm using sucrose nanoparticles. Chargers were operated under various flow conditions in the range of 0.6-5.0 liters per minute. For particular experimental conditions, some deviations from the chosen theoretical model were found for all chargers. For very small particle sizes, the AC-corona charger showed particle losses at low flow rates and did not reach steady-state charge equilibrium at high flow rates. However, for all chargers, operating conditions were identified where the bipolar charge equilibrium was achieved. Practically, excellent particle size conservation was found for all three chargers.

No MeSH data available.


Results of the charging probability measurements of all three chargers for both polarities and three different charger flow rates. The different symbol shapes are indicating the different flow rates (up-pointing triangle = 0.6 lpm; down-pointing triangle = 1.5 lpm; diamond = 5.0 lpm) and the filled and open style indicates the negative and positive polarity of the particles, respectively. The lines represent Wiedensohler’s approximation of Fuchs’ charging theory where the solid and dashed lines stand for negative and positive polarity, respectively. Error-bars are within size of symbols. Values in Tables S1–S3
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Fig5: Results of the charging probability measurements of all three chargers for both polarities and three different charger flow rates. The different symbol shapes are indicating the different flow rates (up-pointing triangle = 0.6 lpm; down-pointing triangle = 1.5 lpm; diamond = 5.0 lpm) and the filled and open style indicates the negative and positive polarity of the particles, respectively. The lines represent Wiedensohler’s approximation of Fuchs’ charging theory where the solid and dashed lines stand for negative and positive polarity, respectively. Error-bars are within size of symbols. Values in Tables S1–S3

Mentions: The results of the charging probability measurements are shown in Fig. 5. The measured values can be found in the supplementary information (Online Resource 1), Tables S1–S3.Fig. 5


Experimental determination of the steady-state charging probabilities and particle size conservation in non-radioactive and radioactive bipolar aerosol chargers in the size range of 5-40 nm.

Kallinger P, Szymanski WW - J Nanopart Res (2015)

Results of the charging probability measurements of all three chargers for both polarities and three different charger flow rates. The different symbol shapes are indicating the different flow rates (up-pointing triangle = 0.6 lpm; down-pointing triangle = 1.5 lpm; diamond = 5.0 lpm) and the filled and open style indicates the negative and positive polarity of the particles, respectively. The lines represent Wiedensohler’s approximation of Fuchs’ charging theory where the solid and dashed lines stand for negative and positive polarity, respectively. Error-bars are within size of symbols. Values in Tables S1–S3
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4385563&req=5

Fig5: Results of the charging probability measurements of all three chargers for both polarities and three different charger flow rates. The different symbol shapes are indicating the different flow rates (up-pointing triangle = 0.6 lpm; down-pointing triangle = 1.5 lpm; diamond = 5.0 lpm) and the filled and open style indicates the negative and positive polarity of the particles, respectively. The lines represent Wiedensohler’s approximation of Fuchs’ charging theory where the solid and dashed lines stand for negative and positive polarity, respectively. Error-bars are within size of symbols. Values in Tables S1–S3
Mentions: The results of the charging probability measurements are shown in Fig. 5. The measured values can be found in the supplementary information (Online Resource 1), Tables S1–S3.Fig. 5

Bottom Line: For particular experimental conditions, some deviations from the chosen theoretical model were found for all chargers.For very small particle sizes, the AC-corona charger showed particle losses at low flow rates and did not reach steady-state charge equilibrium at high flow rates.Practically, excellent particle size conservation was found for all three chargers.

View Article: PubMed Central - PubMed

Affiliation: Faculty of Physics, University of Vienna, Boltzmanngasse 5, 1090 Vienna, Austria.

ABSTRACT

Three bipolar aerosol chargers, an AC-corona (Electrical Ionizer 1090, MSP Corp.), a soft X-ray (Advanced Aerosol Neutralizer 3087, TSI Inc.), and an α-radiation-based (241)Am charger (tapcon & analysesysteme), were investigated on their charging performance of airborne nanoparticles. The charging probabilities for negatively and positively charged particles and the particle size conservation were measured in the diameter range of 5-40 nm using sucrose nanoparticles. Chargers were operated under various flow conditions in the range of 0.6-5.0 liters per minute. For particular experimental conditions, some deviations from the chosen theoretical model were found for all chargers. For very small particle sizes, the AC-corona charger showed particle losses at low flow rates and did not reach steady-state charge equilibrium at high flow rates. However, for all chargers, operating conditions were identified where the bipolar charge equilibrium was achieved. Practically, excellent particle size conservation was found for all three chargers.

No MeSH data available.