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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: 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.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.


Related in: MedlinePlus

Variability of the particle size ratio for the chargers used in this study
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Fig6: Variability of the particle size ratio for the chargers used in this study

Mentions: The measured results of the particle size ratio of all chargers can be found in Fig. 6. A particle size ratio equal to one means that the particle size is conserved by the charger. The error-bars are indicating the standard deviation. Practically negligible differences in the measured particle size were determined whether the charger was on or off. A difference of about 5 % with 5 nm particles was found with the EI at 0.6 lpm flow rate. All other differences were measured to be below 1 %. The increased size (≤0.25 nm) may be an indication of an attachment on the molecular scale.Fig. 6


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)

Variability of the particle size ratio for the chargers used in this study
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

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

Fig6: Variability of the particle size ratio for the chargers used in this study
Mentions: The measured results of the particle size ratio of all chargers can be found in Fig. 6. A particle size ratio equal to one means that the particle size is conserved by the charger. The error-bars are indicating the standard deviation. Practically negligible differences in the measured particle size were determined whether the charger was on or off. A difference of about 5 % with 5 nm particles was found with the EI at 0.6 lpm flow rate. All other differences were measured to be below 1 %. The increased size (≤0.25 nm) may be an indication of an attachment on the molecular scale.Fig. 6

Bottom Line: 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.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.


Related in: MedlinePlus