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The BI-DCP uses light extinction as the basis
for quantifying particles of different sizes following
separation by centrifugal sedimentation. This
means that it is applicable to any kind of particle
or droplet whether organic or inorganic. Even
particles whose density is less than that of their
suspending medium – and which therefore "cream"
rather than sedimenting during the analysis -
oil in water emulsions, for example, can be analysed
just as easily.
The progress of the analysis
can be monitored in real time throughout the measurement,
not only on the screen but also by direct visual
observation of the sample during the centrifugation
process. The Windows software provides a variety
of graphical and tabular outputs including differential
and cumulative distributions of particle sizes
weighted by volume, surface area and number on
linear or logarithmic scales. Plots can be overlaid
for visual comparison. SPC (Statistical Process
Control) charts can easily be built up using measurements
selected from the database of results, quickly
highlighting trends in manufacturing processes
and identifying out of specification materials.
The Brookhaven BI-DCP can be operated in "line-start"
or "homogeneous" modes further extending
its versatility. Brookhaven has pioneered special
techniques which enable even very small, low density
particles to be analysed quickly and reproducibly.
Among the wide range of applications of the DCP
are polymer colloids (latex), carbon black, abrasives,
o/w and w/o emulsions, adhesives, pigments, pharmaceuticals,
cosmetics, paints, inks and many more.
For particles which absorb x-rays (generally
inorganics such as titanium dioxide), Brookhaven
also offer the BI-XDC
X-Ray Disc Centrifuge Particle Size Analyser.
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