Abstract
In view of the influence of particle size on the technological properties of pigments, several aspects of the determination of size distributions with the disc centrifuge have been investigated. A detailed analysis of photodensitometric measurements and their interpretation is given for two methods, one with all particles starting at the same line, the other with the particles initially being distributed uniformly. An empirical relation for fine pigments is pointed out, which can simplify the evaluation for the former. It is also shown that this method can be used for the determination of complex refractive indices of a pigment. It is further established that in both methods a density gradient is necessary to guarantee turbulence-free sedimentation. Finally an automatic data acquisition system is described.
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