Characterization of liquid nanoparticle dispersions by multisample analytical centrifugation
Titus Sobisch¹, Dietmar Lerche¹, PARTEC (2007)
Abstract: Reducing particle dimensions to nanoscale leads to qualitatively new properties. This holds for liquid dispersions, which are the most often used form of application of nanoparticles. For characterization of nanoparticle dispersions techniques are preferable, which avoid dilution, thus don't modify dispersion properties. To this end multisample analytical centrifugation proved an efficient tool. The new multisample approach uses the STEP-technology. Space and time resolved extinction profiles quantify the alteration of particle concentrations but also packing behavior and phase separation during centrifugation. Examples are presented for examination of colloidal crystallization and of microgels. The effect of initial volume concentration and sediment pressure on the speed and extent of the crystallization process was studies. Further, the behavior of microgels was characterized as a function of centrifugal acceleration, temperature, and concentration.
Key words: Particle size analysis • Nanoparticles • Phase separation • Packing behavior • Crystallization • Microgels • Analytical centrifugation • STEP technology
¹ LUM GmbH, Rudower Chaussee 29; 12489 Berlin, GermanyContact us
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