T. Sobisch et D. Lerche, Application of a new separation analyzer for the characterization of dispersions stabilized with clay derivatives, COLLOID P S, 278(4), 2000, pp. 369-374
The performance of a newly developed separation analyzer is demonstrated by
characterization of the sedimentation kinetics and the swelling behavior o
f organoclays in binary solvent mixtures (toluene/cyclohexane) as well as b
y investigation of oil-in-water and water-in-oil emulsions stabilized by cl
ay 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 t
he new device a fast and reproducible characterization of settling behavior
and dispersion stability was possible. Moreover, the evaluation of the lon
g-term stability of samples with high separation stability as well as of th
e heterogenity of the separation process, the sample transparency and the e
lasticity of the sediment as a function of alternating centrifugal force co
uld be carried out.