Size and shape distributions of primary crystallites in titania aggregates

作者：Grulke Eric A; Yamamoto Kazuhiro; Kumagai Kazuhiro; Haeusler Ines; Oesterle Werner; Ortel Erik; Hodoroaba Vasile Dan; Brown Scott C; Chan Christopher; Zheng Jiwen; Yamamoto Kenji; Yashiki Kouji; Song Nam Woong; Kim Young Heon; Stefaniak Aleksandr B; Schwegler Berry D; Coleman Victoria A; Jamting Asa K; Herrmann Jan; Arakawa Toru; Burchett Woodrow W; Lambert Joshua W; Stromberg Arnold J

来源：Advanced Powder Technology, 2017, 28(7): 1647-1659.

DOI：10.1016/j.apt.2017.03.027

• Measurement uncertainty
• Size distribution
• Shape distribution
• TEM
• Titania

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.

• 出版日期2017-7
• 单位国家安全生产监督管理总局信息研究院