Measuring aerosol size distributions with the aerodynamic aerosol classifier

Johnson, Tyler J.; Irwin, M.; Symonds, Jonathan P. R.; Olfert, Jason S.; Boies, Adam M.

doi:10.1080/02786826.2018.1440063

Cited by 53 publications

(76 citation statements)

References 34 publications

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“…It is the diameter of a spherical particle with the same mobility or same aerodynamic drag under a known external force as the particle under consideration 62 . The particle concentration at each DMA or AAC setpoint was measured using a CPC and the size distribution was calculated from these raw measurements following Wang & Flagan 63 or Johnson et al 64 , respectively. Further details regarding the aerosol size distribution measurements are outlined in Supplementary Section S3.1.…”

Section: Methodsmentioning

confidence: 99%

Comprehensive characterization of mainstream marijuana and tobacco smoke

Graves

Johnson

Nishida

et al. 2020

Sci Rep

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Recent increases in marijuana use and legalization without adequate knowledge of the risks necessitate the characterization of the billions of nanoparticles contained in each puff of smoke. Tobacco smoke offers a benchmark given that it has been extensively studied. Tobacco and marijuana smoke particles are quantitatively similar in volatility, shape, density and number concentration, albeit with differences in size, total mass and chemical composition. Particles from marijuana smoke are on average 29% larger in mobility diameter than particles from tobacco smoke and contain 3.4× more total mass. New measurements of semi-volatile fractions determine over 97% of the mass and volume of the particles from either smoke source are comprised of semi-volatile compounds. For tobacco and marijuana smoke, respectively, 4350 and 2575 different compounds are detected, of which, 670 and 536 (231 in common) are tentatively identified, and of these, 173 and 110 different compounds (69 in common) are known to cause negative health effects through carcinogenic, mutagenic, teratogenic, or other toxic mechanisms. This study demonstrates striking similarities between marijuana and tobacco smoke in terms of their physical and chemical properties.

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Section: Methodsmentioning

confidence: 99%

Comprehensive characterization of mainstream marijuana and tobacco smoke

Graves

Johnson

Nishida

et al. 2020

Sci Rep

Self Cite

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“…The size distributions of sNPs are first characterized by a scanning mobility particle spectrometer (SMPS) ( Figure 1b). Owing to the nanoscale of the droplet jet, the nanoparticles (sNPs) formed after solvent removal are well constrained to < 8 nm with a mean diameter (d mean )~3.96 nm, which is much smaller than sNPs formed by a common atomizer (>10 nm) [8,9].…”

Section: Nanoparticle Production From Electrospray Methods With Precmentioning

confidence: 99%

Precise Catalyst Production for Carbon Nanotube Synthesis with Targeted Structure Enrichment

et al. 2020

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The direct growth of single-walled carbon nanotubes (SWCNTs) with a narrow distribution of diameter or chirality remains elusive despite significant benefits in properties and applications. Nanoparticle catalysts are vital for SWCNT synthesis, but how to precisely manipulate their chemistry, size, concentration, and deposition remains difficult, especially within a continuous production process from the gas phase. Here, we demonstrate the preparation of W6Co7 alloyed nanoparticle catalysts with precisely tunable stoichiometry using electrospray, which remain solid state during SWCNT growth. We also demonstrate continuous production of liquid iron nanoparticles with in-line size selection. With the precise size manipulation of catalysts in the range of 1–5 nm, and a nearly monodisperse distribution (σg < 1.2), an excellent size selection of SWCNTs can be achieved. All of the presented techniques show great potential to facilitate the realization of single-chirality SWCNTs production.

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“…formed after solvent removal is well constrained to < 8 nm with mean diameter (dmean) ~3.96 nm, which is much smaller than sNPs formed by a common atomizer (>10 nm) [8,9].…”

Section: Nanoparticle Production From Electrospray Methods With Precismentioning

confidence: 99%

Precise Catalyst Production for Carbon Nanotube Synthesis with Targeted Structure Enrichment

Zhang¹,

Ding²,

Graves³

et al. 2020

Preprint

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The direct growth of single-walled carbon nanotubes (SWCNTs) with a narrow distribution of diameter or chirality remains elusive despite significant benefits in properties and applications. Nanoparticle catalysts are vital for SWCNT synthesis, but how to precisely manipulate their chemistry, size, concentration, and deposition remains difficult, especially within a continuous production process from the gas-phase. Here, we demonstrate the preparation of W6Co7 alloyed nanoparticle catalysts with precisely tunable stoichiometry using electrospray, which remain solid state during SWCNT growth. We also demonstrate continuous production of liquid iron nanoparticles with in-line size selection. With the precise size manipulation of catalysts in the range of 1-5 nm, and a nearly monodisperse distribution (σg < 1.2), an excellent size selection of SWCNT can be achieved. All of the presented techniques show great potential to facilitate the realization of single-chirality SWCNT production.

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Measuring aerosol size distributions with the aerodynamic aerosol classifier

Cited by 53 publications

References 34 publications

Comprehensive characterization of mainstream marijuana and tobacco smoke

Comprehensive characterization of mainstream marijuana and tobacco smoke

Precise Catalyst Production for Carbon Nanotube Synthesis with Targeted Structure Enrichment

Precise Catalyst Production for Carbon Nanotube Synthesis with Targeted Structure Enrichment

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