Premium
Characterization of Pyrogenic Powders with Conventional Particle Sizing Technique: I. Prediction of Measured Size Distributions
Author(s) -
Babick Frank,
Schießl Karin,
Stintz Michael
Publication year - 2012
Publication title -
particle and particle systems characterization
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.877
H-Index - 56
eISSN - 1521-4117
pISSN - 0934-0866
DOI - 10.1002/ppsc.201000024
Subject(s) - sizing , aggregate (composite) , particle size , particle size distribution , dynamic light scattering , characterization (materials science) , materials science , light scattering , particle (ecology) , fractal , biological system , mineralogy , scattering , chemical engineering , optics , nanotechnology , chemistry , mathematics , physics , nanoparticle , geology , oceanography , organic chemistry , engineering , biology , mathematical analysis
Pyrogenic powders consist of fractal like aggregates with nanosized primary particles. The formation of such aggregates, their hydrodynamic behavior and their optical properties are in principle well understood. Even so, there is only little experience in interpreting results from particle sizing of such materials. Dramatic differences in size distribution obtained from different measurement techniques give frequently rise to confusion on the “true” aggregate size. However, such differences can be attributed to the different particle properties used for size measurement and to the different types of quantities, by which the frequency of the individual size fractions are weighted. For two conventional sizing techniques, Dynamic Light Scattering and Optical Centrifugation Analysis, the influence of the structural properties on the relevant optical and hydrodynamic aggregate properties is discussed on the basis of virtual aggregates as well as of empirical data for pyrogenic powders. Finally measurable size distributions are predicted in a case study.