Performance study of various Condensation Particle Counters (CPCs): development of a methodology based on steady-state airborne DEHS particles and application to a series of handheld and stationary CPCs

Bau, Sébastien; Toussaint, A.; Payet, Raphaël; Witschger, Olivier

doi:10.1088/1742-6596/838/1/012002

Cited by 6 publications

(4 citation statements)

References 27 publications

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“…To minimize instrumental or model differences, post-data correction equations were proposed by Lee et al (2013) to adjust the data from TSI water-based CPC using exponential models. Bau et al (2017Bau et al ( , 2019 show that w&b-CPC studied were found to be within ± 25 % of the reference, except for a w-CPC (TSI model 3787) known to be highly sensitive to particle hydrophobicity. It is important to note that such parameter will have a minor effect in our study due to the sample nature.…”

Section: Experimental Setup and Smps Typesmentioning

confidence: 87%

An intercomparison exercise of good laboratory practices for nano-aerosol size measurements by mobility spectrometers

et al. 2020

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An intercomparison exercise of good laboratory practices for nanoaerosols size measurements by mobility spectrometersAn intercomparison campaign on nanoparticle size measurement was organized in the frame of the French nanoMetrology club. The aim of this study is to make an inventory of the metrological capabilities of all measurement techniques in France involved in the "nano" size range, including the SMPS (Scanning Mobility Particle Sizer) concerning aerosol metrology. For this study, four samples have been proposed, namely (1) -a SiO 2 colloidal suspension (FD304) consisting of a monomodal population, (2)two samples consisting of two nanoparticle populations of SiO 2 having proportions to be determined and(3) -a TiO 2 colloidal suspension. Ten SMPS associated to five participants around a common experimental setup were performed in link with a control SMPS to have simultaneous measurement s with a same instrument in each laboratory in parallel with the SMPS used by each partner. This article presents SMPS results of this study associated with the description of the experimental set -up and the sample preparation protocol with an identified schedule and comparison with SEM measurements. The present paper does not focus on the actual capability of the tested mobility spectrometers, but aims to highlight s the good laboratory practices using their own but common resources in terms of aerosol generation and measurement set-ups.

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Section: Experimental Setup and Smps Typesmentioning

confidence: 87%

An intercomparison exercise of good laboratory practices for nano-aerosol size measurements by mobility spectrometers

et al. 2020

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“…However, higher concentrations were not tested. Others have tested the transition from single counting mode to photometric mode and noticed differences for a Grimm 5.401 CPC [35], a TSI 3022A [36] and a water CPC [37]. The only study with high concentrations, up to 10 7 #/cm 3 [15], compared many instruments with various polydisperse materials.…”

Section: Discussionmentioning

confidence: 99%

Assessment of two condensation particle counters (CPCs) in photometric mode for high concentration exhaust emission measurements

Giechaskiel¹,

Melas²,

Mamakos³

2023

Combustion Engines

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Condensation particle counters (CPCs) use light scattering to count particles after they have grown to micron size in a supersaturated environment. In single counting mode each particle is counted depending on whether the scattered light exceeds a threshold value or not. In photometric mode the total scattered light is converted in particle number concentration. While for laboratory grade particle number systems, CPCs are allowed to operate only in single counting mode, there is no such requirements for portable emissions measurements systems (PEMS) for real-driving emissions (RDE) testing or for instruments for periodic technical inspection (PTI) of vehicles. In this study two CPCs of the same model were assessed in single counting and photometric modes with silver and graphite particles with sizes ranging from 10 nm to 100 nm. The results showed that the concentration was measured accurately enough for particles in the 25 nm to 50 nm size range, but was underestimated and overestimated for smaller and larger particles, respectively. The key message is that the photometric mode should be avoided or calibrated in function of concentration and particle size.

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“…The Continuously Stirred Tank Aerosol Reactor offers a simple framework for examining the formation and evolution of aerosol particles from vapor phase and has been investigated extensively (Bau et al 2017;McGraw 1997;Pratsinis, Friedlander, and Pearlstein 1986) for specific cases. The condensation process is central to this system as it introduces a fascinating feedback mechanism inducing oscillatory growth (McGraw and Saunders 1984).…”

Section: Discussionmentioning

confidence: 99%

Evolution dynamics of fractal aggregates in continuously stirred tank aerosol reactors using generalized condensation exponents

Krishan

Anand

Mayya

et al. 2020

Aerosol Science and Technology

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Understanding the evolution of aerosol metrics in Continuously Stirred Aerosol Reactors (CSTAR) is of considerable importance for the generation and synthesis of aerosol particles with controlled size and morphological properties. Generally, the dynamic equations governing the depletion of precursor monomer species as well as the evolution of aerosol metrics are solved by method of moments. These provide a simpler, alternative system of ordinary differential equations in place of the complicated integro-partial differential system of general dynamics equation for the entire size distribution function. A fundamental question pertains to the existence of closure of the moment equations, consistent with aerosol processes. In this article, we derive constraints on the values of condensation exponent in the pre-coagulation regime of CSTAR, which lead to a system of closed moment equations. The relevant condensation processes on fractal aggregates corresponding to some of these exponents are also identified. Stability analysis for these systems is carried out by formulating and solving their characteristic equations. The solutions are examined by numerically integrating the moment equations, which show interesting non-monotonic behavior with respect to ventilation rate (reciprocal of residence time). The study not only highlights the general features of the aerosol evolution equation, but also demonstrates its usefulness for optimizing the yield of particles across a range of growth exponents.

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Performance study of various Condensation Particle Counters (CPCs): development of a methodology based on steady-state airborne DEHS particles and application to a series of handheld and stationary CPCs

Cited by 6 publications

References 27 publications

An intercomparison exercise of good laboratory practices for nano-aerosol size measurements by mobility spectrometers

An intercomparison exercise of good laboratory practices for nano-aerosol size measurements by mobility spectrometers

Assessment of two condensation particle counters (CPCs) in photometric mode for high concentration exhaust emission measurements

Evolution dynamics of fractal aggregates in continuously stirred tank aerosol reactors using generalized condensation exponents

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