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Enhancing the detection efficiency of condensation particle counters for sub-2 nm particles. / Barmpounis, K.; Ranjithkumar, A.; Schmidt-Ott, A.; Attoui, M; Biskos, G.

In: Journal of Aerosol Science, Vol. 117, 01.03.2018, p. 44-53.

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Barmpounis, K. ; Ranjithkumar, A. ; Schmidt-Ott, A. ; Attoui, M ; Biskos, G. / Enhancing the detection efficiency of condensation particle counters for sub-2 nm particles. In: Journal of Aerosol Science. 2018 ; Vol. 117. pp. 44-53.

BibTeX

@article{68bc8fef19004727a323151b39d284d3,
title = "Enhancing the detection efficiency of condensation particle counters for sub-2 nm particles",
abstract = "The detection efficiency of Condensation Particle Counters (CPCs) reduces drastically as particle size becomes smaller than 2 nm. Increasing the supersaturation in order to enhance the detection efficiency, has limited applicability because the onset supersaturation value of droplet formation by homogeneous nucleation is very close to the heterogeneous onset supersaturation for sub-2 nm particles. In this work we introduce a new method for increasing the detection efficiency of CPCs for sub-2 nm particles, which relies mainly on controlling the spatial distribution of the supersaturation profile by simply modifying the operating temperatures of the CPC. We evaluated the new method by generating monodisperse particles in the size range of 0.98–4.50 nm and used them to characterize a TSI 3025 CPC. We achieved significant increase of the detection efficiency for sub-2 nm particles. Furthermore, we calculated the supersaturation field developed in the condenser tube with a finite element model and used it to determine the detection efficiency according to heterogeneous nucleation theory. These calculations reveal that the observed increase of the detection efficiency can be explained by the manipulation of the spatial distribution of the supersaturation field. The method introduced here can greatly improve the detection efficiency of CPCs and in the meantime further extend their use for particle sizing purposes in the sub-2-nm range.",
author = "K. Barmpounis and A. Ranjithkumar and A. Schmidt-Ott and M Attoui and G. Biskos",
year = "2018",
month = "3",
day = "1",
doi = "10.1016/j.jaerosci.2017.12.005",
language = "English",
volume = "117",
pages = "44--53",
journal = "Journal of Aerosol Science",
issn = "0021-8502",
publisher = "Elsevier",

}

RIS

TY - JOUR

T1 - Enhancing the detection efficiency of condensation particle counters for sub-2 nm particles

AU - Barmpounis, K.

AU - Ranjithkumar, A.

AU - Schmidt-Ott, A.

AU - Attoui, M

AU - Biskos, G.

PY - 2018/3/1

Y1 - 2018/3/1

N2 - The detection efficiency of Condensation Particle Counters (CPCs) reduces drastically as particle size becomes smaller than 2 nm. Increasing the supersaturation in order to enhance the detection efficiency, has limited applicability because the onset supersaturation value of droplet formation by homogeneous nucleation is very close to the heterogeneous onset supersaturation for sub-2 nm particles. In this work we introduce a new method for increasing the detection efficiency of CPCs for sub-2 nm particles, which relies mainly on controlling the spatial distribution of the supersaturation profile by simply modifying the operating temperatures of the CPC. We evaluated the new method by generating monodisperse particles in the size range of 0.98–4.50 nm and used them to characterize a TSI 3025 CPC. We achieved significant increase of the detection efficiency for sub-2 nm particles. Furthermore, we calculated the supersaturation field developed in the condenser tube with a finite element model and used it to determine the detection efficiency according to heterogeneous nucleation theory. These calculations reveal that the observed increase of the detection efficiency can be explained by the manipulation of the spatial distribution of the supersaturation field. The method introduced here can greatly improve the detection efficiency of CPCs and in the meantime further extend their use for particle sizing purposes in the sub-2-nm range.

AB - The detection efficiency of Condensation Particle Counters (CPCs) reduces drastically as particle size becomes smaller than 2 nm. Increasing the supersaturation in order to enhance the detection efficiency, has limited applicability because the onset supersaturation value of droplet formation by homogeneous nucleation is very close to the heterogeneous onset supersaturation for sub-2 nm particles. In this work we introduce a new method for increasing the detection efficiency of CPCs for sub-2 nm particles, which relies mainly on controlling the spatial distribution of the supersaturation profile by simply modifying the operating temperatures of the CPC. We evaluated the new method by generating monodisperse particles in the size range of 0.98–4.50 nm and used them to characterize a TSI 3025 CPC. We achieved significant increase of the detection efficiency for sub-2 nm particles. Furthermore, we calculated the supersaturation field developed in the condenser tube with a finite element model and used it to determine the detection efficiency according to heterogeneous nucleation theory. These calculations reveal that the observed increase of the detection efficiency can be explained by the manipulation of the spatial distribution of the supersaturation field. The method introduced here can greatly improve the detection efficiency of CPCs and in the meantime further extend their use for particle sizing purposes in the sub-2-nm range.

UR - http://www.scopus.com/inward/record.url?scp=85039843574&partnerID=8YFLogxK

U2 - 10.1016/j.jaerosci.2017.12.005

DO - 10.1016/j.jaerosci.2017.12.005

M3 - Article

VL - 117

SP - 44

EP - 53

JO - Journal of Aerosol Science

T2 - Journal of Aerosol Science

JF - Journal of Aerosol Science

SN - 0021-8502

ER -

ID: 37385013