GRIMM Messgeräte weltweit in Publikationen vertreten

Nanoparticle Measurement Systems

Title: Transfer Functions and Penetrations of Five Differential Mobility Analyzers for Sub-2 nm Particle Classification
Author: Jingkun Jiang, Michel Attoui, Michael Heim, Nicholas Brunelli, Peter McMurry, Gerhard Kasper, Richard Flagan, Konstantinos Giapis, and Guillaume Mouret
Date of Publication: 2011
Hyperlink: Link
Product: 55100



The transfer functions and penetrations of five differential mobility analyzers (DMAs) for sub-2 nm particle classification were evaluated in this study. These DMAs include the TSI nanoDMA, the Caltech radial DMA (RDMA) and nanoRDMA, the Grimm nanoDMA, and the Karlsruhe-Vienna DMA. Measurements were done using tetra-alkyl ammonium ion standards with mobility diameters of 1.16, 1.47, and 1.70 nm. These monomobile ions were generated by electrospray followed by high resolution mobility classification. Measurements were focused at a aerosol-to-sheath flow ratio of 0.1. A data inversion routine was developed to obtain the true transfer function for each test DMA, and these measured transfer functions were compared with theory. DMA penetration efficiencies were also measured. An approximate model for diffusional deposition, based on the modified Gormley and Kennedy equation using an effective length, is given for each test DMA. These results quantitatively characterize the performance of the test DMAs in classifying sub-2 nm particles and can be readily used for DMA data inversion.

Title: Characterization of the counting efficiency of Condensation Particle Counters
Author: Dipl.-Ing. Stephan Rennecke / Prof. Dr. rer. nat. A. Weber
Date of Publication: 2014
Product: Condensation Particle Counter „CPC“, Model 5414 and Model 5416

In the present report the counting efficiency of Condensation Particle Counters (CPCs) of the company Grimm Aerosol Technology is determined. The measurements have been carried out for the models 5.414 and 5.416 in their possible operating modes. To account for a possible influence of particle material or morphology, the counting efficiencies have been measured using sodium chloride (NaCl), silver (Ag) and tungsten oxide particles in different morphologies (single particles, agglomerates and aggregates). The experiments have been carried out according to the future norm ISO 27891, if possible.

Title: Comprehensive Measurement of atmospheric Aerosols with a Wide Range Aerosol Spectrometer
Author: SpeielvogelJ., Keck L. Guo X. Pesch M.
Date of Publication: 2010
Hyperlink: Link
Product: WRAS

In this Paper, the measuring principle of a wide range aerosol spectromete (WRAS) with more than 70 size channels from 5.5 nm to 32 micrometer is introduced. Comprehensive measurements of atmospheric aerosols were performed with Grimm WRAS system at the Atmosphere Wathc (GAW) Statioon in Hohenpeissenberg in Germany. These wide range data were combined with simultaneous concentrations obtained from aerosol size distributions measured with the WRAS system were compared to TSI CPC counts and TEOM results, showing a good correlation. The correlation between these data aööows the source apportionment of particles, the investigaion of aerosol transport, transformation and mixing processes, as well as the research on the effect of atmospheric aerosols on the human health and climate.

Title: Transfer Functions and Penetrations of Five Differential Mobility Analyzers for Sub-2 nm Particle Classification
Author: Michael Heim, Jingkun Jiang, Michel Attoui, Nicholas Brunelli, Peter McMurry, Gerhard Kasper, Richard Flagan, Konstantinos Giapis, and Guillaume Mouret
Date of Publication: 2010
Hyperlink:
Product: 55100

The transfer functions and penetrations of five differential mobility analyzers (DMAs) for sub-2 nm particle classification were evaluated in this study. These DMAs include the TSI nanoDMA, the Caltech radial DMA (RDMA) and nanoRDMA, the Grimm nanoDMA, and the Karlsruhe-Vienna DMA. Measurements were done using tetra-alkyl ammonium ion standards with mobility diameters of 1.16, 1.47, and 1.70 nm. These monomobile ions were generated by electrospray followed by high resolution mobility classification. Measurements were focused at a aerosol-to-sheath flow ratio of 0.1. A data inversion routine was developed to obtain the true transfer function for each test DMA, and these measured transfer functions were compared with theory. DMA penetration efficiencies were also measured. An approximate model for diffusional deposition, based on the modified Gormley and Kennedy equation using an effective length, is given for each test DMA. These results quantitatively characterize the performance of the test DMAs in classifying sub-2 nm particles and can be readily used for DMA data inversion.

Title: Comment on: Penetration of Ultrafine Particles and Ion Clusters Through Wire Screens by Ichitsubo et al.
Author: M. Heim a; B. J. Mullins a; G. Kasper
Date of Publication: 2008
Hyperlink: Link
Product: 55100

Arecent paper by the authors (Heim et al. 2005) examined the filtration efficiency of nanoparticles in the 2.5–20 nm size range, in an attempt to determine if thermal bounce occurs. The work included a critical review of previous work, including the work of Ichitsubo et al. (1996), which was the only paper found by the authors which appeared to detect actual “thermal rebound.” Further investigation of the results and methods used by Ichitsubo et al. (1996), have allowed us to conclude with a high degree of certainty, that the results shown can be attributed to the poor sizing performance of the DMA used rather than actual particle thermal bounce effects.

Title: Performance of Vienna Type Differential Mobility Analyzer at 1.2-20 Nanometer
Author: G. P. Reischl a; J. M. Mäkelä b; J. Necid a
Date of Publication: 1997
Hyperlink: Link
Product: 55-U

The transfer functions of the so called "Vienna type" differential mobility analyzer (DMA) were studied experimentally at the size range of 1.2-20 nm following the procedure suggested by Stolzenburg (1988) Ph.D. Thesis. For the study, two identical DMAs were used as a tandem DMA (TDMA) arrangement to measure nanoparticles from a hot wire WO, generator. The approximate analytical formulae by Stolzenburg describing diffusion broadening of the DMA transfer function were observed to be valid with high accuracy from 20 nm down to - 2 nm. In the size range of 1.2-2 nm nominal mobility equivalent diameter small deviations of the shape of the TDMA output signal predicted by Stolzenburg were found. AEROSOSLC IENCEA ND TECHNOLO2G7:6Y5 1-672 (1997) 0 1997 American Association for Aerosol Research

Title: Ultrafine particles over Eastern Australia: an airborne survey
Author: WOLFGANG JUNKERMANN, and JORG M. HACKER2, 1Karlsruhe Institute of Technology, IMK-IFU, Garmisch-Partenkirchen, Germany; 2School of the Environment, Flinders University, Adelaide, Australia
Date of Publication: 2015
Hyperlink: Link

Ultrafine particles (UFP) in the atmosphere may have significant impacts on the regional water and radiation budgets through secondary effects on cloud microphysics. Yet, as these particles are invisible for current remote sensing techniques, knowledge about their three-dimensional distribution, source strengths and budgets is limited. Building on a 40-yr-old Australia-wide airborne survey which provides a reference case study of aerosol sources and budgets, this study presents results from a new airborne survey over Eastern Australia, northern New South Wales and Queensland. Observations identified apparent changes in the number and distribution of major anthropogenic aerosol sources since the early 1970s, which might relate to the simultaneously observed changes in rainfall patterns over eastern Queensland. Coal-fired power stations in the inland areas between Brisbane and Rockhampton were clearly identified as the major sources for ultrafine particulate matter. Sugar mills, smelters and shipping along the coast close to the Ports of Townsville and Rockhampton were comparable minor sources. Airborne Lagrangian plume studies were applied to investigate source strength and ageing properties within power station plumes. Significant changes observed, compared to the measurements in the 1970s, included a significant increase in the number concentration of UFP related to coal-fired power station emissions in the sparsely populated Queensland hinterland coincident with the area with the most pronounced reduction in rainfall.

Keywords: power station, emission, coal, aerosol, precipitation, regional climate impact


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