Grinding products, Oxides, Salts
The method of choice for the characterization of micronisation (such as grinding, breaking, etc.) and granulation processes is first and foremost laser diffraction. If one ventures into the sub-micrometer range during grinding processes in wet dispersions, acoustic spectrometry becomes a highly viable method, as it is working especially well in the nanometer region and at high concentration while not being subject to the limitations of laser diffraction with regards to particle size and concentration. In conjunction with electro acoustics, the online analysis of both particle size and zeta potential in micro- and nanometer ranges of concentrated dispersions becomes possible. This strategy is also possible for products which do not derive from a grinding method, such as oxides (e.g. alumina oxide, silica oxide) in the form of powders and granules as well as salts. BET-surface area, density and particle size analysis play an important role for these materials as well.