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Particle size distributions by transmission electron microscopy: an interlaboratory comparison case study.

Authors
Rice-SB; Chan-C; Brown-SC; Eschbach-P; Han-L; Ensor-DS; Stefaniak-AB; Bonevich-J; Vladar-AE; Walker-ARH; Zheng-J; Starnes-C; Stromberg-A; Ye-J; Grulke-EA
Source
Metrologia 2013 Dec; 50(6):663-678
NIOSHTIC No.
20043484
Abstract
This paper reports an interlaboratory comparison that evaluated a protocol for measuring and analysing the particle size distribution of discrete, metallic, spheroidal nanoparticles using transmission electron microscopy (TEM). The study was focused on automated image capture and automated particle analysis. NIST RM8012 gold nanoparticles (30 nm nominal diameter) were measured for area-equivalent diameter distributions by eight laboratories. Statistical analysis was used to (1) assess the data quality without using size distribution reference models, (2) determine reference model parameters for different size distribution reference models and non-linear regression fitting methods and (3) assess the measurement uncertainty of a size distribution parameter by using its coefficient of variation. The interlaboratory area-equivalent diameter mean, 27.6 nm +/- 2.4 nm (computed based on a normal distribution), was quite similar to the area-equivalent diameter, 27.6 nm, assigned to NIST RM8012. The lognormal reference model was the preferred choice for these particle size distributions as, for all laboratories, its parameters had lower relative standard errors (RSEs) than the other size distribution reference models tested (normal, Weibull and Rosin-Rammler-Bennett). The RSEs for the fitted standard deviations were two orders of magnitude higher than those for the fitted means, suggesting that most of the parameter estimate errors were associated with estimating the breadth of the distributions. The coefficients of variation for the interlaboratory statistics also confirmed the lognormal reference model as the preferred choice. From quasi-linear plots, the typical range for good fits between the model and cumulative number-based distributions was 1.9 fitted standard deviations less than the mean to 2.3 fitted standard deviations above the mean. Automated image capture, automated particle analysis and statistical evaluation of the data and fitting coefficients provide a framework for assessing nanoparticle size distributions using TEM for image acquisition.
Keywords
Nanotechnology; Analytical-processes; Particulates; Metal-dusts; Metallic-dusts; Statistical-analysis; Models
Contact
Eric A Grulke, Chemical and Materials Engineering, University of Kentucky, Lexington, KY 40506
CODEN
MTRGAU
Publication Date
20131201
Document Type
Journal Article
Email Address
eric.grulke@uky.edu
Fiscal Year
2014
NTIS Accession No.
NTIS Price
Identifying No.
M122013
Issue of Publication
6
ISSN
0026-1394
NIOSH Division
DRDS
Priority Area
Manufacturing
Source Name
Metrologia
State
MA; DE; OR; NC; WV; MD; KY
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