Chapter 6 Understanding the views
Page 6-12 MAN 0384
Consider a cylindrical particle of diameter 20 microns and length 60 microns. The
volume of the cylinder is:
ill 7973
The sphere of equivalent volume would have a diameter centred on:
with a spread from 20 to 60mm.
It is interesting to compare this with other techniques. Sieving would pass the par-
ticles through a 20mm aperture and classify them as 20mm. Sedimentation would
give a result related to the total surface area, in this case reporting a diameter of
around 40mm.
If there’s a need to correlate laser diffraction results with values from some other
technique, consider applying a shape correction using the Result Modification
procedure built into the Malvern software.
V π 10µm()
2
60µm()=
6V
π
-------
3
33µm=
MAN0384-1.0 Mastersizer 2000.book Page 12 Tuesday, March 20, 2007 8:56 AM
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