Dresden 2014 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 54: Poster Session 3

CPP 54.14: Poster

Thursday, April 3, 2014, 15:00–19:00, P2

Modular fluidic System for Agglomeration Experiments — •Dominik Gerstner and Tobias Kraus — Leibniz-Institut für Neue Materialien (INM), Campus D2 2, D-66123 Saarbrücken

Nanoparticles (NP) are used in research and in an increasing number of applications. Agglomeration of their dispersion can occur in every processing step and is often regarded a nuisance. We exploit agglomeration to tune structure and properties of particle-containing nanocomposites [1]. To understand the structure-directing mechanisms, we systematically study the agglomeration of NP having different cores and surfaces. Here, we present a steady-state approach to NP agglomeration studies that uses fluidics and online analysis to improve precision, comparability and throughput. The setup lets us investigate shear effects in nanoparticle processing, too. We combine UV/Vis Spectroscopy and Small Angle X-ray scattering techniques to characterize agglomerates. We discuss experimental challenges that have to be overcome for such flow-based experiments. Proper reagent mixing is crucial, but limited by the laminar flows, and requires careful tuning of flow rates. Agglomerating particles tend to adsorb on the inner walls of the system. We develop strategies to avoid excessive fouling. This contribution shows first results on the tuning of agglomeration states under steady state conditions.

[1] P. Born and T. Kraus. Phys. Rev. E 87 (2013), 062313.