Berlin 2015 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
CPP: Fachverband Chemische Physik und Polymerphysik
CPP 46: P11: Wetting, Micro and Nano Fluidics
CPP 46.19: Poster
Mittwoch, 18. März 2015, 10:00–13:00, Poster A
Pickering-emulsion for catalytic reactions — •Dmitrij Stehl1, Adrian Carl1, Kornelia Gawlitza1, Regine von Klitzing1, Tina Skale2, Anja Drews2, Lena Hohl3 und Matthias Kraume3 — 1Physikalische Chemie, TU Berlin, Straße des 17. Juni 124, 10623 Berlin — 2Verfahrenstechnik in Life Sci. Eng., FB 2, HTW Berlin, Wilhelminenhofstr. 75 A, 12459 Berlin — 3Verfahrenstechnik, TU Berlin, Frauenhoferstr. 33-36, 10587 Berlin
A Pickering-emulsion (PE) was reported by RAMSDEN in 1903 for the first time. S. U. PICKERING studied this type of solids-stabilized emulsions systematically. PEs can be used in medicine for drug delivery or for catalytic reactions, for example for the hydroformylation of long chained olefins (1-Dodecene) in a water in oil (w/o-) emulsion. In this study, the water droplets (water phase) which are surrounded by SiO2-nanoparticles as stabilizer, contain [HRh(CO)(TPPTS)3] (TPPTS = 3,3',3''-Phosphanetriyltris (benzenesulfonic acid) trisodium salt) as homogeneous catalyst. The solids-stabilized water droplets are emulsified in 1-Dodecene (oil phase). After the hydroformylation, the water droplets with the catalyst can be easily separated from the product by membrane filtration and used again for the next reactions. Preliminary experiments showed that an increase in amount of SiO2-nanoparticles led to an augmentation of the product yield (Tridecanal) and decrease the droplet size from 0,02 to 0,005 mm. An addition of surfactant (Triton X-100) at low concentration (< cmc) increases the product yield as well but has no effect on the droplet size, which is surprising.