Regensburg 2016 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 28: Poster - Complex Fluids, Granular Matter, Glasses

DY 28.15: Poster

Dienstag, 8. März 2016, 18:15–21:00, Poster C

Confinement effects on binary mixtures of water and glycerol investigated by 1H and 2H NMR — •Max Schaefer, Edda Klotz, and Wida Kohshekan — Institut für Festkörperphysik, Tu Darmstadt, 64289 Darmstadt, Hochschulstraße 6, Germany

Dynamics in binary mixtures of water and glycerol with various concentrations was investigated by NMR. Applying different NMR technics the dynamics was studied in a broad temperature range down to very low temperatures. As a confinement effect the freezing point of water can be suppressed. Using 2H spin-lattice relaxation and stimulated-echo experiments we determined the rotational correlation function. By 1H diffusion measurements in an ultra high static field gradient the confinement effect on the translational motion caused by geometric restrictions as well as by surface interactions was studied. The dynamical properties were investigated within different types of confinement having various solidities. By comparison to the dynamics of their bulk systems, the influence of "soft confinement" (proteins) and "hard confinements" (MCM 41 with various pore diameters) was ascertained. A possible microphase separation of glycerol and water initiated by the confinement, is also of great interest.