Investigation of the bipolar charge distribution at various gas conditions

Wiedensohler, Alfred; Lütkemeier, E.; Feldpausch, M.; Helsper, C.

doi:10.1016/0021-8502(86)90118-7

Cited by 95 publications

(66 citation statements)

References 7 publications

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“…As a result, the values of ion mass and mobility reported in the aerosol charging literature lie within a considerable wide range of values, in spite that in most of the works the ion generation technique employed was the same, e.g. air ions generated from 241 Am (Hussin et al, 1983;Wen et al, 1984;Adachi et al, 1985;Hoppel and Frick, 1986;Wiedensohler et al, 1986;Hoppel and Frick, 1990;Wiedensohler and Fissan, 1991;Alonso et al, 1997).…”

Section: Introductionmentioning

confidence: 77%

“…Evolution of the mobility distribution of negative air ions generated by 241 Am during the early stages of aging. Hussin et al (1983) 1.15 1.39 Wen et al (1984) and Adachi et al (1986) 1.40 1.90 Hoppel and Frick (1986) 1.20 1.35 Wiedensohler et al (1986) 1.35 1.60 Hoppel and Frick (1990) 1.33 1.84 Wiedensohler and Fissan (1991) 1.40 1.60 Reischl et al (1996) 1.15 1.43 Alonso et al (1997) 1 It is important to recall that the mobilities reported in the above three plots (as well as in the remaining Figures below) are reduced mobilities. The value of mobility at other P, T conditions can be estimated with Langevin's equation, Eq.…”

Section: Air Ions Frommentioning

confidence: 85%

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First Differential Mobility Analysis (DMA) Measurements of Air Ions Produced by Radioactive Source and Corona

Alonso¹,

Santos

Hontañón

et al. 2009

Aerosol Air Qual. Res.

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A recently developed Differential Mobility Analyzer (DMA) of high resolving power (50 for ions of mobility equivalent diameter∼1 nm) has been used to measure the mobility distribution of laboratory air ions generated by 241 Am and corona discharge. In the case of 241 Am, it has been possible to follow the changes in mobility during the early stages of ion aging: within the time interval between 10 and 30 ms after ion formation, the mean reduced mobility of positive ions decreased from 1.30 to 1.15 cm 2 /Vs, and that of negative ions from 2.0 to 1.75 cm 2 /Vs. The mobility distribution of air ions at the outlet of a corona ionizer strongly depends on the corona voltage, mainly due to the mobility-dependent extent of electrostatic losses within the ionizer. The mean reduced mobility of corona ions ranged between 1.01 and 1.20 cm 2 /Vs (positive) and 1.76 and 1.96 cm 2 /Vs (negative).

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Section: Introductionmentioning

confidence: 77%

Section: Air Ions Frommentioning

confidence: 85%

First Differential Mobility Analysis (DMA) Measurements of Air Ions Produced by Radioactive Source and Corona

Alonso¹,

Santos

Hontañón

et al. 2009

Aerosol Air Qual. Res.

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“…The distribution obtained from Fuch's model was approximated by Wiedensohler (1988), via an empirical expression which allows a quick solution of the bipolar charge distribution in the size range of 1-1000 nm. (Wiedensohler, et al, 1986) (Galdhar, 2004) The Faraday cup aerosol electrometer consists of an electrometer and a filter inside a Faraday cage mounted on an insulator. Charged particles collected by the filter, generate an electric current which is measured by the electrometer.…”

Section: B3 Bipolar Diffusion Charging Of Aerosol Particlesmentioning

confidence: 99%

Generation of nanoparticles by spark discharge

et al. 2008

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“…The fraction of spherical particles carrying more than two charges is given by Gunn and Woessner (1956). The ion mobilities used in their calculations are adopted from the paper of Wiedensohler et al (1986), ion masses from the paper of Hussin et al (1983), and the correction of α-parameter (collision probability of ions with the particle) from the work of Hoppel and Frick (1986). developed a charging theory for chain aggregates by combining the drag model from Chan and Dahneke (1981) and the charge equivalent diameter concept from Wen et al (1984a).…”

Section: Fuchs' Limiting Sphere Theory For Spherical Particlesmentioning

confidence: 99%

Bipolar Diffusion Charging of Aggregates

Xiao

Swanson

Pui

et al. 2012

Aerosol Science and Technology

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In this paper, the effect of particle morphology on bipolar diffusion charging is studied. A modified tandem differential mobility analyzer (TDMA) method used to measure the charge distribution of submicron particles in the range of 70-300 nm is described in detail. The method requires an independent measurement of the neutral fraction, followed by the measurement of the size-dependent charge distribution, which requires the knowledge of the neutral fraction. The method was validated experimentally using dioctyl sebacate and ammonium sulfate spherical particles and compared with Fuchs' theory. Diesel particles and silver aggregates were used to evaluate the impact of morphology on charging. The results show that aggregates have a slightly lower (about 7%) neutral fraction than spheres. These results are in agreement with the predictions of Lall and Friedlander's theory and previous studies. However, results from charge distribution indicate that more (about 46%) particles are negatively charged than predicted by Lall and Friedlander's theory, while 32% fewer particles are positively charged. This relatively large asymmetry between the negative and the positive charge fraction is not fully predicted by either Fuchs' or aggregate charging theories. Our results suggest that the current inversion method of scanning mobility particle sizer (SMPS) data, based on Fuchs' or Lall and Friedlander's distribution, would underestimate the total number concentration by about 15% or 27% if applied to diesel aggregates.

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Investigation of the bipolar charge distribution at various gas conditions

Cited by 95 publications

References 7 publications

First Differential Mobility Analysis (DMA) Measurements of Air Ions Produced by Radioactive Source and Corona

First Differential Mobility Analysis (DMA) Measurements of Air Ions Produced by Radioactive Source and Corona

Generation of nanoparticles by spark discharge

Bipolar Diffusion Charging of Aggregates

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