Regensburg 2019 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 15: Topical session (Symposium MM): Correlative and in-situ Microscopy in Materials Research
MM 15.2: Topical Talk
Tuesday, April 2, 2019, 10:45–11:15, H44
Experimental observations of molecular ordering in slitconfined non-polar fluids — •Oliver H. Seeck, Milena Lippmann, Anita Ehnes, and Florian Bertram — Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, 22607 Hamburg, Germany
The molecular order of non–polar liquids constrained in slit–geometry of a few molecular diameters exhibits distinct features which cannot be found in bulk liquids. A well–known example is the formation of molecular layering along the surface normal of the confining substrates. Another aspect is the observation that the shear modulus and the viscosity of confined liquids are similar to those observed in the solid bulk phase. The latter phenomenon is known as confinement–induced solidification. Imaging the confined liquid films with Å–resolution in all tree dimenions is a greate challenge. We have developed a setup for film thicknesses down to 30 Å and which is compatible with X–ray scattering methods such as reflectivity, grazing incidence diffraction and Bragg-scattering. At confined CCl4–films we have proven the co–existance of a layered phase and a crystalline phase. In the future we will investigate the response of the molecular order to shear forces being applied to the confined films with a new setup.