Chapter 4 Making measurements - a tutorial
Page 4-20 MAN 0384
Materials and dispersants listed may have a small icon beside their entry in the lists:
A red star – these items cannot be deleted or modified. They have special sig-
nificance either because they are commonly used, such as water, or they have
been generated in a special way, such as the Fraunhofer particle type.
A small Malvern logo – these items can be deleted or modified but a warning is
displayed first. Items marked in this way have been added by Malvern Instru-
ments and are thought to have universal application. Examples are Polystyrene
latex and Propan-2-ol.
The initial installation of the Mastersizer 2000 software includes other particle
materials and dispersants not marked with the icons described above. These are
examples used at Malvern Instruments; delete these if they are not appropriate.
Result calculation
The process of result calculation can be configured in a number of ways, depending
on what is known about the sample. Clicking on the Models button enables selec-
tion of one of three models, General purpose (default), Multiple narrow
modes or Single mode.
Clicking on the Advanced button allows the selection of reduced ranges or spe-
cific result transformations. Click on the relevant Advice button for advice.
Note (Mastersizer 2000 only)
The Mastersizer 2000 uses red and blue light to measure samples. For cer-
tain materials (most notably certain inks and pigments) the sample has
substantially different refractive indices in red and blue light. This is nor-
mally due to the material being highly absorbing in one of the two wave
lengths. In these cases it is necessary to enter both refractive indices.
For most materials, there is no need to enter a blue refractive
index. If a blue refractive index is not given, the Mastersizer assumes that
it has the same value as the red refractive index. Blue refractive indices can
be found from papers and textbooks in the same way as red refractive index
information. When no information is available, determine the most appro-
priate choice of refractive index by looking at the fit and residual reports
and comparing the results obtained with other observations, e.g. micro-
scope images.
MAN0384-1.0 Mastersizer 2000.book Page 20 Tuesday, March 20, 2007 8:56 AM
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