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Determination of highly resolved particle size distributions in the submicron range by ultracentrifugation
Author(s) -
Mächtle Walter
Publication year - 1992
Publication title -
makromolekulare chemie. macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 0258-0322
DOI - 10.1002/masy.19920610111
Subject(s) - range (aeronautics) , particle size , analytical ultracentrifugation , particle (ecology) , particle size distribution , materials science , ultracentrifuge , chromatography , chemistry , statistical physics , physics , composite material , geology , oceanography
Two methods, the H 2 O/D 2 O‐analysis and the Coupling‐Particle‐Size‐Distribution(PSD)‐Technique, to determine the distribution of the density and the sire of sub‐micron particles by means of an ultracentrifuge, are outlined. Either of them base only on Stokes' equations and on Mie's light scattering theory. Because of the possibility to measure seven samples simultaneously and to raise the rotor speed exponentially from 0 to 40,000 rpm, particle diameters from 10 to 3000 nm can be measured at high resolution. The H 2 O/D 2 O‐analysis supplies a density distribution and also a size distribution, provided the sample is chemically homogeneous. The Coupling‐PSD‐Technique allows to determine highly resolved size distributions of extremely broad distributed dispersions by only one single run. Several examples applying either method are given.