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DY: Fachverband Dynamik und Statistische Physik

DY 62: Glasses and Glass transition (joint session DY/CPP)

DY 62.6: Vortrag

Freitag, 5. April 2019, 11:15–11:30, H19

Local and translational dynamics of water in various confinements investigated via ¹H and ²H NMR — •Simon Schoner, Max Weigler, and Michael Vogel — TU Darmstadt, Institut für Festkörperphysik, Hochschulstr. 6, 64289, Darmstadt, Germany

Confined water is interesting for several reasons. On the one hand the topic is highly relevant in biology or geology where water is often found in soft or hard confinements, water around proteins or in rods being prime examples. On the other hand confined water allows one to investigate liquid water at low temperatures, where normally crystallization would occur, and, in this way, to obtain insights into the heavily debated glass transition of water. We investigate the dynamics of water confined in various rigid matrices using ¹H and ²H NMR experiments. One goal is to obtain information on the influence of different kinds of confinements and pore sizes on the self diffusion and the structural relaxation of water. Especially, we address the question whether translational diffusion and local reorientation are affected by confinement in a comparable way. First measurements with D₂O and H₂O indicate similar correlation times and diffusion coefficients for both MCM-48 and MCM-41 confinements with comparable pore sizes between 2 and 3 nm.