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Testing a new photocentrifuge for submicron particles with silica spheres
Author(s) -
Niemann Jochen,
Weichert Reiner
Publication year - 1995
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.19950120607
Subject(s) - mie scattering , spheres , extinction (optical mineralogy) , range (aeronautics) , particle (ecology) , centrifuge , particle size , wavelength , particle size distribution , materials science , optics , computation , physics , computational physics , light scattering , scattering , chemistry , mathematics , quantum mechanics , composite material , oceanography , algorithm , astronomy , geology
A theory has been developed for spectral photosedimentation in a centrifuge. The use of several wavelengths allows particle size analyses in the submicron range without a knowledge of the optical material properties and is not restricted to spherical particles. As a result of this theory the extinction efficiency and the particle size distribution of the analysed particles can be calculated even for non‐spherical particles from an experiment. A photocentrifuge has been built according to the developed theory. The theory has been verified by the measurement of spherical particles for which Mie theory is applicable. The experimentally obtained extinction efficiency agrees well with computations according to Mie theory. The accuracy of measured particle size distributions is comparable to those measured with other sedimentometers.