Counting efficiency and detection limit of condensation nuclei counters for submicrometer aerosols

Scheibel, H.G.; Porstendörfer, J.

doi:10.1016/0021-9797(86)90301-2

Cited by 14 publications

(2 citation statements)

References 32 publications

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“…where q is the electrostatic charge and " and " 0 are dielectric constants of the droplet and vacuum, respectively (Scheibel and Porstendörfer 1986). The charge effect is shown in Table 1, where estimated Kelvin diameters are compared for particles with charge and without charge.…”

Section: Basics Of Heterogeneous Nucleationmentioning

confidence: 99%

A Transition from Heterogeneous to Homogeneous Nucleation in the Turbulent Mixing CNC

Mavliev¹,

Hopke²,

Wang³

et al. 2001

Aerosol Science and Technology

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A new method for changing the supersaturation in the Turbulent Mixing CNC has been developed and used to examine the transition from heterogeneous nucleation of test particles to homogenous nucleation of working uid: dibutylphthlate (DBP). Supersaturation was controlled by changing the DBP vapor pressure in the nozzle ow by saturating only a predetermined part of the ow, while the total ow and temperature remain constant. This approach allows for the changing of the initial DBP vapor pressure, while keeping the ow structure and temperature eld unchanged. The DBP concentration in the outlet of the vapor generator was measured experimentally for different ratios of saturated and bypass ows and found to be close to estimated values. Experimental results for transitions from heterogeneous nucleation to homogeneous nucleation are presented for NaCl and WO x particles at various DBP vapor pressures. With an increasing of the DBP vapor pressure, the concentration of enlarged particles increases until it reaches a plateau. At higher initial values of DBP pressure, homogeneous nucleation prevails, and the number concentration of particles follows a curve typical for homogeneous nucleation recorded in the absence of nuclei. Nuclei with different mobility diameters were activated at different values of vapor pressure. There are signi cant differences in the slopes of particle activation curves for NaCl and WO x particles. The reasons for such differences are a subject for continuing research.

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Section: Basics Of Heterogeneous Nucleationmentioning

confidence: 99%

A Transition from Heterogeneous to Homogeneous Nucleation in the Turbulent Mixing CNC

Mavliev¹,

Hopke²,

Wang³

et al. 2001

Aerosol Science and Technology

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show abstract

“…Scheibel and Porstendörfer [13,14] in a theoretical and experimental studies used insoluble (hydrophobic) particles of silver and hydrophilic particles of NaCl to measure the detection efficiency of the General Electric water expansion CPC down to 2 nm. The particles were produced by evaporation-condensation material in the well-known Scheibel and Porstendörfer generator [15].…”

Section: Introductionmentioning

confidence: 99%

Activation of sub 2 nm Water Soluble and Insoluble Standard Ions with Saturated Vapors of Butanol in a Boosted TSI ultrafine CPC

Attoui

Kangasluoma

2019

Atmosphere

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Tetraheptylammonium bromide (THABr), tetrabutylammonium bromide (TBABr) and tetraethylammonium bromide (TEABr) dissolved in methanol or water methanol mixtures (~ 1mM) produce via positive electrospray atomization and high resolution classification electrical classification standard clean ions (monomer and dimer) which are singly charged. THABr is hydrophobic and insoluble in water, TBABr and TEABr are hygroscopic and water soluble (0.6 and 2.8 kg/l respectively). These ions are used to study the effect of hygroscopicity on the activation of aerosol particles in the sub 2 nm range via the detection efficiency measurement of a boosted ultrafine TSI condensation particle counter (3025A). Water solubility of particles seems to play a role in the activation and growth with butanol vapor in the CPC (condensation particle counter) independently of the size.

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Condensation Particle Counters

Cheng¹

2011

Aerosol Measurement

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Counting efficiency and detection limit of condensation nuclei counters for submicrometer aerosols

Cited by 14 publications

References 32 publications

A Transition from Heterogeneous to Homogeneous Nucleation in the Turbulent Mixing CNC

A Transition from Heterogeneous to Homogeneous Nucleation in the Turbulent Mixing CNC

Activation of sub 2 nm Water Soluble and Insoluble Standard Ions with Saturated Vapors of Butanol in a Boosted TSI ultrafine CPC

Condensation Particle Counters

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