Application of a new separation analyzer for the characterization of dispersions stabilized with clay derivatives
ABSTRACT The performance of a newly developed separation analyzer is demonstrated by characterization of the sedimentation kinetics
and the swelling behavior of organoclays in binary solvent mixtures (toluene/cyclohexane) as well as by investigation of oil-in-water
and water-in-oil emulsions stabilized by clay derivatives. The automatic measuring system – LUMiFuge 114 – is based on a special
centrifuge with an integrated optoelectronic sensor system which allows the measuring of spatial and temporal changes of light
transmission during the rotation in a variable centrifugal field (12–1200g). By using the new device a fast and reproducible characterization of settling behavior and dispersion stability was possible.
Moreover, the evaluation of the long-term stability of samples with high separation stability as well as of the heterogenity
of the separation process, the sample transparency and the elasticity of the sediment as a function of alternating centrifugal
force could be carried out.