Size and Shape Distributions of Primary Crystallites in Titania Aggregates

Details

• Personal Author:
  Arakawa T ; Brown SC ; Burchett WW ; Chan C ; Colemen VA ; Grulke EA ; Hausler I ; Herrmann J ; Hodoroaba V-D ; Jamting AK ; Kim YH ; Kumagai K ; Lambert JW ; Ortel E ; Osterle W ; Schwegler-Berry D ; Song NW ; Stefaniak, Aleksandr B. ; Stromberg AJ ; Yamamoto K ; Yashiki K ; Zheng J
• Description:
  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. [Description provided by NIOSH]
• Subjects:
  Laboratories Occupational Health Particulate Matter Safety Titanium
• Keywords:
  Author Keywords: Measurement Uncertainty Electron Microscopy Laboratory Testing Particle Size Analysis Particulates Shape Distribution Size Distribution TEM Titania Titanium Dioxide
• ISSN:
  0921-8831
• Document Type:
  Text
• Genre:
  Journal Article
• Place as Subject:
  Delaware ; Kentucky ; Maryland ; OSHA Region 3 ; OSHA Region 4 ; West Virginia
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  RHD - Respiratory Health Division
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  28
• Issue:
  7
• NIOSHTIC Number:
  nn:20049798
• Citation:
  Adv Powder Technol 2017 Jul; 28(7):1647-1659
• Contact Point Address:
  E.A. Grulke, Chemical & Materials Engineering, University of Kentucky, Lexington, KY, USA
• Email:
  eric.grulke@uky.edu
• CAS Registry Number:
  Titania (CAS RN 13463-67-7)
• Federal Fiscal Year:
  2017
• Peer Reviewed:
  False
• Source Full Name:
  Advanced Powder Technology
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:7dad02b36000dfca0aac1375a666be93872cf27f3a7cb07124bed10559f40b04fc7f8f320a743daec1eb2962ade0f672b0079ded0db6c252753c4f09956b782f
• Download URL:
  https://stacks.cdc.gov/view/cdc/210424/cdc_210424_DS1.pdf
• File Type:
  [PDF - 1.86 MB ]