Berlin 2018 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 3: Complex Fluids and Colloids I (joint session CPP/DY)
DY 3.12: Vortrag
Montag, 12. März 2018, 12:30–12:45, C 264
Control of physico-chemical properties of Pickering emulsions for catalysis — •Dmitrij Stehl1, Tobias Pogrzeba2, Lena Hohl3, Yuri Lvov4, Matthias Kraume3, Reinhard Schomäcker2, and Regine von Klitzing1 — 1Festkörperphysik, TU Darmstadt, Darmstadt, Deutschland — 2Institut für Chemie, TU Berlin, Berlin, Deutschland — 3Prozess- und Verfahrenstechnik, TU Berlin, Berlin, Deutschland — 4Institute for Micromanufacturing, Lousiana Tech University, Lousiana, USA
Pickering-emulsions (PEs) are particle-stabilized emulsions. Different solid nanoparticles stabilize emulsion droplets against coalescence. Halloysite nanotubes (HNT) can be used as emulsifier. These particles are multiwall, inorganic tubes with negative charges at the outer surface and positive charges at the inner surface. The length of the HNTs in this study is 800 +- 200 nm and the outer diameter is 50 nm. HNTs adsorb laterally at the water/oil interface and the energy of detachment is several 10.000 kT. Due to the anisotropy of the HNT, the behavior of the nanotubes at the interface is different from spherical particles and the stability of the respective PE is higher which is studied in detail. The effect of different parameters on the structure of the PEs is studied, like HNT surface modification and energy input by the PE-fabrication, effect of HNT concentration, salt (NaCl) concentration and pH. In this study, the hydroformylation of long chain olefins (1-Dodecene) in PEs was used as a model system. The water phase contains the homogeneous Rh-catalyst and the oil phase (1-Dodecene) is simultaneous the reactant.