Berlin 2018 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 70: Crystallization, Nucleation and Self-Assembly II
CPP 70.7: Vortrag
Donnerstag, 15. März 2018, 17:00–17:15, C 230
In situ Formation and Growth Characterization of Iron Oxide Nanoparticles by Synchrotron X-Ray Scattering Techniques — •Robert Wendt1,2, Eike Gericke1,2, Anna Lang2, Dragomir Tatchev3, Giorgia Greco1, Markus Wollgarten4, Armin Hoell1, Klaus Rademann2, and Simone Raoux1,5 — 1Helmholtz-Zentrum Berlin für Materialien und Energie, Institute for Nanospectroscopy, DE — 2Humboldt-Universität zu Berlin, Department of Chemistry, DE — 3Bulgarian Academy of Sciences, Institute of Physical Chemistry, Sofia, BG — 4Helmholtz-Zentrum Berlin für Materialien und Energie, Department of Nanoscale Structures and Microscopic Analysis, DE — 5Humboldt-Universität zu Berlin, Department of Physics, DE
This work includes an innovative measurement setup for microwave-assisted nanoparticle syntheses which facilitates in situ investigations of pressurized colloidal solutions by allowing exact addition of precursor solution into the sealed vessel reactor and withdrawal of colloid solution at any time. Thereby, we are able to investigate and characterize the early stages from molecule to nanoparticle in a time-range of milliseconds by coupling in situ UV-Vis spectroscopy, synchrotron based Wide-Angle and Small-Angle X-ray Scattering. These in situ studies are combined with complementary ex situ methods, Transmission Electron Microscopy, Electron Energy Loss Spectroscopy and X-ray Absorption Spectroscopy. By combining these results, we provide concepts for formation and growth mechanisms of iron oxide nanoparticles which were synthesized by microwave-assisted solvothermal routes.