Nanoparticle Distribution in Concentrated Transparent and Opaque Dispersions

Dietmar Lerche, LUM GmbH, Berlin, Germany

Highly concentrated dispersion of nanoparticles are increasingly getting practical importance (e.g. energy storage media, functionalized inks and coatings etc.). These products have to be analyzed during design, processing and in quality control.

Overmost analytical techniques need sample dilution, which change the dispersion behavior, like rheology, phase separation, flocculation etc.

A new technique is presented to analyse separation behavior, consolidation without dilution and to characterize sediment/ cake structures. the STEP®-Technology (Space and Time resolved Extinction Profiles) was developed, using high resolution photometric detection with X-ray source. Detection of nanoparticles in supernatant of suspension consisting of Quartz , and also Pigment (ZnO) segregation within opaque sun protection cream will be presented in the poster.