Morphological characterization of carbon nanofiber aerosol using tandem mobility and aerodynamic size measurements

Deye, Gregory J.; Kulkarni, Pramod; Ku, Bon Ki

doi:10.1007/s11051-012-1112-1

Cited by 5 publications

(2 citation statements)

References 21 publications

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“…The aerodynamic diameter of fibers is typically governed by their width, while their electric mobility is also influenced by their length 46 . Therefore a significant difference was expected between PSD of electric mobility diameter (SMPS) compared to aerodynamic diameter (ELPI) 49 .…”

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confidence: 99%

Complex Aerosol Characterization by Scanning Electron Microscopy Coupled with Energy Dispersive X-ray Spectroscopy

Brostrøm

Kling

Hougaard

et al. 2020

Sci Rep

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Particulate matter (PM) air pollution is a central concern for public health. Current legislation relies on a mass concentration basis, despite broad acceptance that mass alone is insufficient to capture the complexity and toxicity of airborne PM, calling for additional and more comprehensive measurement techniques. We study to what extent scanning electron microscopy coupled with energy dispersive X-ray spectroscopy (SEM/EDS) can be applied for physicochemical characterization of complex aerosols, and investigate its potential for separating particle properties on a single particle basis, even for nanosized particles. SEM/EDS analysis is performed on impactor samples of laboratory generated aerosols, consisting of either NaCl, Halloysite fibers, soot-like Printex90 agglomerates, or their combination. The analysis is automated and performed as EDS maps, covering a statistically relevant number of particles, with analysis times of approximately one hour/sample. Derived size distributions are compared to scanning mobility particle sizer (SMPS) and electric low-pressure impactor (ELPI) results. A method is presented to estimate airborne number concentrations and size distributions directly from SEM results, within a factor 10 of SMPS and ELPI outcomes. A classification scheme is developed based on elemental composition, providing class-specific information with individual particle statistics on shape, size, and mixing state. This can identify primary particles for source apportionment and enables easy distinction between fibrous and dense particle classes, e.g. for targeted risk assessments. Overall, the SEM/EDS analysis provides a more detailed physicochemical characterization of PM than online measurements, e.g. SMPS and ELPI. The method has the potential to improve assessments of PM exposure and risk, and facilitates source identification, even without prior knowledge at sampling.

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confidence: 99%

Complex Aerosol Characterization by Scanning Electron Microscopy Coupled with Energy Dispersive X-ray Spectroscopy

Brostrøm

Kling

Hougaard

et al. 2020

Sci Rep

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show abstract

“…However, the lack of understanding about the physical and chemical properties of these particles tremendously limits our ability to understand, predict, and control their applications and impacts in the system. Therefore, characterization of these particles is important in many scientific and engineering applications [8].…”

Section: Introductionmentioning

confidence: 99%

Contact-free microparticle characterization via Raman spectroscopy and digital holography

Subedi

Adhikari

Berg

et al. 2018

J. Opt.

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This work develops an integrated system combining digital holography with confocal Raman spectroscopy using a single monochromatic laser source. One unique, and useful, aspect of the approach is that it utilizes backward scattered light permitting operation without contacting the sample, i.e. as a short-range ‘standoff’ sensor. Chemical composition analysis of microparticles is available through the Raman component while particle imaging is achieved with the holographic component. Demonstrations of the characterization capability are presented for non-spherical microparticles in the ∼10–200 μm size range. These include sugar and microbial-pigment particles and demonstrate that the integrated system may have potential for applications in biomedical research for species-specific sensing. The results also suggest that the characterization capability could be applied to airborne respirable-sized particles in free-flowing aerosol form.

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A review of measurement techniques for aerosol effective density

Peng

Zhang

et al. 2021

Science of The Total Environment

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Morphological characterization of carbon nanofiber aerosol using tandem mobility and aerodynamic size measurements

Cited by 5 publications

References 21 publications

Complex Aerosol Characterization by Scanning Electron Microscopy Coupled with Energy Dispersive X-ray Spectroscopy

Complex Aerosol Characterization by Scanning Electron Microscopy Coupled with Energy Dispersive X-ray Spectroscopy

Contact-free microparticle characterization via Raman spectroscopy and digital holography

A review of measurement techniques for aerosol effective density

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