Abstract
The primary crystallite size of titania powder relates to its properties in a number of applications. Transmission electron microscopy was used in this interlaboratory comparison (ILC) to measure primary crystallite size and shape distributions for a commercial aggregated titania powder. Data of four size descriptors and two shape descriptors were evaluated across nine laboratories. Data repeatability and reproducibility was evaluated by analysis of variance. One-third of the laboratory pairs had similar size descriptor data, but 83% of the pairs had similar aspect ratio data. Scale descriptor distributions were generally unimodal and were well-described by lognormal reference models. Shape descriptor distributions were multi-modal but data visualization plots demonstrated that the Weibull distribution was preferred to the normal distribution. For the equivalent circular diameter size descriptor, measurement uncertainties of the lognormal distribution scale and width parameters were 9.5% and 22%, respectively. For the aspect ratio shape descriptor, the measurement uncertainties of the Weibull distribution scale and width parameters were 7.0% and 26%, respectively. Both measurement uncertainty estimates and data visualizations should be used to analyze size and shape distributions of particles on the nanoscale.
Original language | English |
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Pages (from-to) | 1647-1659 |
Number of pages | 13 |
Journal | Advanced Powder Technology |
Volume | 28 |
Issue number | 7 |
DOIs | |
State | Published - Jul 2017 |
Bibliographical note
Publisher Copyright:© 2017
Funding
The authors thank Toshiyuki Fujimoto and Naoyuki Taketoshi of AIST for their advice and counsel with respect to ISO/TC229 needs and requirements of this study. The authors also thank the following researchers at NIST for their useful critiques regarding this ILC: Angela Hight Walker, Jeff Fagan, Vince Hackley, and John Bonevich. The work by AIST was part of the research program of “strategic international standardization acceleration projects” supported by the Ministry of Economy, Trade, and Industry (METI) of Japan. The work by BAM on this project was supported by the SETNanoMetro Seventh Framework Programme project (project number 604577; call identifier FP7-NMP-2013_LARGE-7). The work by KRISS was part of the project, “Nano Material technology Development Program (2014M3A7B6020163) of MSIP/NRF. The findings and conclusions in this report are those of the authors and do not necessarily represent the views of the National Institute for Occupational Safety and Health.
Funders | Funder number |
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John Bonevich | |
SETNanoMetro Seventh Framework Programme | 604577, FP7-NMP-2013_LARGE-7 |
Toshiyuki Fujimoto and Naoyuki Taketoshi of AIST | |
National Institute of Standards and Technology | |
Ministry of Economy, Trade and Industry | |
Ministry of Science, ICT and Future Planning | |
Korea Research Institute of Standards and Science | 2014M3A7B6020163 |
Korea Research Institute of Standards and Science | |
National Research Foundation of Korea |
Keywords
- Measurement uncertainty
- Shape distribution
- Size distribution
- TEM
- Titania
ASJC Scopus subject areas
- General Chemical Engineering
- Mechanics of Materials