Regensburg 2019 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 77: Organic Molecules on Inorganic Substrates V: Solid-Liquid Interfaces, Self-Organization, Ordering
O 77.4: Vortrag
Donnerstag, 4. April 2019, 11:15–11:30, H9
Specific Interactions of Organic Solvents on Hydrophobic Surfaces — •Annemarie Pfnür1, Johannes Will2, Florian Bertram3, Milena Lippmann3, and Tobias Unruh1 — 1Institute of Crystallography and Structural Physics, Friedrich-Alexander-Universität Erlangen- Nürnberg (FAU), Staudtstr. 3, 91058 Erlangen, Germany — 2Department of Materials Science and Engineering, Chair of Micro- and Nanostructure Research, Friedrich-Alexander-Universität Erlangen- Nürnberg (FAU), Cauerstr. 6, 91058 Erlangen, Germany — 3DESY Photon Science, Notkestr. 85, 22607 Hamburg, Germany
The stabilization mechanism of organic nanoparticles in aqueous dispersion produced by liquid antisolvent precipitation without additional stabilizers is under discussion. It is assumed that the solvent used in the production process forms a stabilizing layer at the interface of the nanoparticles.
In order to study this stabilizing layer, we developed a well defined planar model system for the liquid/solid interface. In a liquid cell, the interface of the sample to various solvents and solvent-water mixtures was studied by in-situ X-ray reflectometry (XRR).
A comprehensive analysis with a uniform model for all measurement curves demonstrated the existence of a solvent layer, with a thickness increasing systematically with the solvent concentration of the solvent-water mixture. The layer formation is correlated to the molecular size, the molar volume, as well as the polar and the hydrogen bond fraction of the Hansen solubility parameters.