Analytical and empirical transfer functions of a simplified spectromètre de mobilité electrique circulaire (SMEC) for nano particles

Fißan, H.; Pöcher, Arndt; Neumann, Siegfried; Boulaud, D.; Pourprix, M.

doi:10.1016/s0021-8502(97)10014-3

Cited by 17 publications

(14 citation statements)

References 7 publications

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“…Therefore, a novel portable nanoparticle sizing and counting instrument (NanoScan SMPS TSI 3910; Tritscher et al 2013) was recently commercialized for real-time nanoparticle measurements within the range from 10 to 420 nm. This device incorporates a nonradioactive unipolar diffusion charger (corona jet type) (Medved et al 2000), a radial differential mobility analyzer (rDMA; Zhang et al 1995;Fissan et al 1998) and an isopropanol-based CPC. The main advantage of this instrument is its portability (<9 kg), battery operation without the need to use power supply, small size (LxWxH D 45 £ 23 £ 39 cm), and the use of a nonradioactive unipolar charger which makes it a suitable monitor for real-time workplace measurements without the transport and application restrictions currently affecting traditional SMPS instruments.…”

Section: Introductionmentioning

confidence: 99%

Intercomparison of a portable and two stationary mobility particle sizers for nanoscale aerosol measurements

Fonseca

Viana

Pérez

et al. 2016

Aerosol Science and Technology

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During occupational exposure studies, the use of conventional scanning mobility particle sizers (SMPS) provides high quality data but may convey transport and application limitations. New instruments aiming to overcome these limitations are being currently developed. The purpose of the present study was to compare the performance of the novel portable NanoScan SMPS TSI 3910 with that of two stationary SMPS instruments and one ultrafine condensation particle counter (UCPC) in a controlled atmosphere and for different particle types and concentrations.The results show that NanoScan tends to overestimate particle number concentrations with regard to the UCPC, particularly for agglomerated particles (ZnO, spark generated soot and diesel soot particles) with relative differences >20%. The best agreements between the internal reference values and measured number concentrations were obtained when measuring compact and spherical particles (NaCl and DEHS particles). With regard to particle diameter (modal size), results from NanoScan were comparable < [ § 20%] to those measured by SMPSs for most of the aerosols measured.The findings of this study show that mobility particle sizers using unipolar and bipolar charging may be affected differently by particle size, morphologies, particle composition and concentration. While the sizing accuracy of the NanoScan SMPS was mostly within §25%, it may miscount total particle number concentration by more than 50% (especially for agglomerated particles), thus making it unsuitable for occupational exposure assessments where high degree of accuracy is required (e.g., in tier 3). However, can be a useful instrument to obtain an estimate of the aerosol size distribution in indoor and workplace air, e.g., in tier 2.

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Section: Introductionmentioning

confidence: 99%

Intercomparison of a portable and two stationary mobility particle sizers for nanoscale aerosol measurements

Fonseca

Viana

Pérez

et al. 2016

Aerosol Science and Technology

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“…Until now, nano-DMAs (nDMA) were mainly characterized in a sequential setup [18][19][20][21][22], in which a first mobility analyser produced monodisperse aerosol particles from a polydisperse aerosol source, and a second mobility analyser scanned the size distribution produced by the first one. This setup enabled the comparison of the quality of the mobility analysis in terms of resolution and particle diffusion, but opens the field for interpretation of the collected results, because both DMAs have influence on the characteristics of the resulting size spectrum.…”

Section: Introductionmentioning

confidence: 99%

Comparison of various nano-differential mobility analysers (nDMAs) applying globular proteins

Laschober

Kaddis²,

Reischl

et al. 2007

Journal of Experimental Nanoscience

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The demand for analysis of nanosized particles and assemblies of biologic and inorganic origin has increased in the recent decade together with the growing development of biotechnology and nanotechnology. Recent developments of electrostatic differential mobility analysis (DMA) provide an excellent characterization tool in the nanometer size range. With an increasing number of available nano-DMA (nDMA) systems, the question of data comparability and implementation of possible calibration procedures arise. Here we present analysis of proteins in a range between 3 nm (5.7 kDa) and 15 nm (660 kDa) with five different nDMA systems. Results show differences in the obtained sizes up to 15% between different nDMA systems, which consequently leads to the conclusion that a calibration procedure for each nDMA is necessary when applying such systems for the analysis of nanoparticles with respect to size and molecular mass.

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“…It is evident from the experimental results that the DMAs with the smallest Peclet numbers, i.e., V (H ) long and V (S) long (Table 2), deviated the most from the ideal behavior (Tables 4 and 5), which indicates that particle diffusion may have in uenced the results. However, judging from the results by Fissan et al (1998), the deviation from the ideal transfer function is much too large for such an explanation. Hence the deviations most probably were caused by differences between the DMAs other than the length.…”

Section: Discussionmentioning

confidence: 95%

“…In order to minimize the in uence from diffusional broadening of the transfer function, the particle size was chosen based on the fact that the Peclet number should always be larger than approximately 10,000 (Fissan et al 1998). This was obtained for the particle diameter 0.1 ¹m for all DMAs investigated.…”

Section: Application To Measurementsmentioning

confidence: 99%

Methodology to Estimate the Transfer Function of Individual Differential Mobility Analyzers

Martinsson¹,

Karlsson²,

Frank³

2001

Aerosol Science and Technology

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A method to estimate the nonideal features of the transfer function of individual differential mobility analyzers (DMA) was developed and tested experimentally. This was up to now an unsolved problem, which is important for the precision in DMA measurements. The method involves three DMAs of unknown characteristics, which are used in three rounds of experiments with two DMAs according to a xed schedule. The width of the transfer functions of the three DMAs is obtained in a single tting procedure where one parameter is tted to each DMA transfer function and the particle losses in each DMA are calculated in direct relation to that parameter and parameters known from the experiment. It was shown that the proposed method could solve the apportioning problem and unambiguousl y estimate the transfer function width and the particle losses in each of the DMAs.

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Analytical and empirical transfer functions of a simplified spectromètre de mobilité electrique circulaire (SMEC) for nano particles

Cited by 17 publications

References 7 publications

Intercomparison of a portable and two stationary mobility particle sizers for nanoscale aerosol measurements

Intercomparison of a portable and two stationary mobility particle sizers for nanoscale aerosol measurements

Comparison of various nano-differential mobility analysers (nDMAs) applying globular proteins

Methodology to Estimate the Transfer Function of Individual Differential Mobility Analyzers

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