Size Determination of Latex Particles by Electron Microscopy

Yamada, Yuji; Miyamoto, Katsuhiro; Koizumi, Akira

doi:10.1080/02786828508959050

Cited by 23 publications

(13 citation statements)

References 13 publications

(14 reference statements)

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“…Aqueous suspensions of PSL's are often used to validate an A-CRDS system because they have certified tolerances obtained by direct comparison to National Institute of Standards and Technology Standard Reference Materials (Yamada et al 1985). The monodisperse distribution (geometric standard deviation, σ g , ∼1.01) of aerosolized PSL's is attractive as it can be narrower than the output of a DMA.…”

Section: Calibrating With Size-selected Particlesmentioning

confidence: 99%

A Calibration Technique for Improving Refractive Index Retrieval from Aerosol Cavity Ring-Down Spectroscopy

Toole¹,

Renbaum-Wolff

Smith³

2013

Aerosol Science and Technology

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Cavity ring-down spectroscopy (CRDS) is a technique that is commonly used to measure the extinction of light by aerosol particles in situ. This extinction, when normalized to particle concentration, yields the extinction cross section, a measure of a single particle's ability to scatter and absorb light. The complex index of refraction can then be retrieved by comparison of the extinction cross sections at several particle diameters with those predicted by Mie theory. This approach requires accurate determination of particle diameter and concentration as well as the length of the extinction region in the cavity, but it is often difficult to quantify the systematic errors in the measurements of these quantities. Here, we introduce a calibration technique using particles of a reference compound to account for these systematic errors. The two calibration parameters are: C f , which scales the measured extinction cross sections, and d, which shifts the particle diameters. It is found that C f correlates strongly with the condensation particle counter (CPC) used to measure particle concentration and that d is associated with the differential mobility analyzer (DMA) used to select particle diameters. Calibration is shown to reduce errors of subsequently-measured extinction cross sections of a test aerosol from 11% to <2% with a concomitant improvement in the accuracy of the retrieved complex index of refraction and corresponding atmospheric radiative forcing estimates.

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Section: Calibrating With Size-selected Particlesmentioning

confidence: 99%

A Calibration Technique for Improving Refractive Index Retrieval from Aerosol Cavity Ring-Down Spectroscopy

Toole¹,

Renbaum-Wolff

Smith³

2013

Aerosol Science and Technology

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“…Their nominal sizes are 0.109, 0.176, 0.210, 0.312, and 0.330 pm in diameter. The size properties of these samples had already been examined by electron microscopy and had been shown in our previous study (Yamada et al, 1985). Test particles were prepared by nebulizing dilute aqueous suspensions of PSL particles.…”

Section: Methodsmentioning

confidence: 99%

“…Differences in standard deviations were also found (Yamada et al, 1985). Secondly, we measured sizes of these PSL particles with a laser particle counter.…”

Section: Size Measurements Of Latex Particles By Laser Aerosol Spectrmentioning

confidence: 99%

“…Indeed, the nominal diameter might not be always correct, and Porstendorfer's diameter cannot be available for all PSL samples either. In our previous study we found some differences among sizes of samples with the same nominal diameter (Yamada et al, 1985). The size of the PSL sample used in this study had been measured as 0.167 pm by electron microscopy.…”

Section: Size Distribution Of Psl Particlesmentioning

confidence: 99%

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Size Measurements of Latex Particles by Laser Aerosol Spectrometer

Yamada¹,

Miyamoto²,

Koizumi³

1986

Aerosol Science and Technology

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Size measurements of PSL (polystyrene latex) particles in a s u e range from 0.109 to 0.330 pm were made by laser aerosol spectrometer (PMS, LAS-X). The results were compared with those by electron microscopy. For example, the geometric standard deviation, o, , of nominally 0.176-pm PSL particles was measured as 1.05, assuming that their sues distribute log-normally. The value of 1.05 was very close to 1.02 measured by electron microscopy. It was found that the spectrometer had very high size resolution, although the size resolution of the light scattering type spectrometer has been said to be poor. For some samples of PSL particles, however, there were large differences between particle sizes measured by LAS-X and those by electron microscopy. It was also found that LAS-X had a problem in calibration of size response curve.

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“…Latex particles were chosen because they can be manufactured with extremely uniform sizes [19]. In addition, their shape can be uniquely described by their diameter which can be measured accurately using either SEM [20] or light scattering [21, 221. Experiments were performed to determine particle removal as a function of particle size and concentration, filter media thickness, filtration velocity, filter loading and feed particle size distribution. A model was developed to predict filter performance as a function of these variables.…”

Section: Introductionmentioning

confidence: 99%

Sieving Capture of Liquidborne Particles by microporous membrane filtration media

Grant

Liu

1991

Part & Part Syst Charact

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Test methodology has been developed to measure the particle removal efficiency of microporous membrane filtration media under conditions in which sieving is the dominant particle capture mechanism. The methodology was used to determine the particle capture efficiency of a 0.45 pm membrane filter for removal of submicrometer sized particles from DI water. Particle capture was found to be a strong function of particle diameter, filter media thickness, and filter loading. Particle removal efficiency increased with increasing particle diameter and media thickness. It decreased with increased filter loading when the filters were challenged with the smaller particles used in this study. Removal efficiency initially decreased then subsequently increased during loading with larger particles. Capture was independent of filtration velocity and particle concentration. A sieving model was developed to predict particle capture by the filter media as a function of particle diameter, filter thickness and filter loading. The model was found to accurately predict breakthrough of monodisperse particle suspensions through the media. Particle breakthrough occurred more slowly than predicted when the filters were challenged with a polydisperse particle suspension.

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Size Determination of Latex Particles by Electron Microscopy

Cited by 23 publications

References 13 publications

A Calibration Technique for Improving Refractive Index Retrieval from Aerosol Cavity Ring-Down Spectroscopy

A Calibration Technique for Improving Refractive Index Retrieval from Aerosol Cavity Ring-Down Spectroscopy

Size Measurements of Latex Particles by Laser Aerosol Spectrometer

Sieving Capture of Liquidborne Particles by microporous membrane filtration media

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