Berlin 2018 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 79: Wetting, Microfluidics and Confined Liquids II
CPP 79.2: Vortrag
Freitag, 16. März 2018, 09:45–10:00, PC 203
Dynamic activity of water confined in hydrophobic and hydrophilic pores probed by neutron spectroscopy — •Margarita Russina1, Veronika Grzimek1, Moritz-Casper Schlegel1,2, and Anita Petrova1,3 — 1Helmholtz Zentrum Berlin für Materialied und Energie, Hahn-Meitner Platz 1, 14109 Berlin — 2BAM Federal Institute for Materials Research and Testing, Unter den Eichen 87, 12205 Berlin , Germany — 3Saint-Petersburg State University , Faculty of Physics, Petrodvorets, Ulyanovskaya str., 1, Saint-Petersburg, Russia, 198504
The understanding of hydrogen bonds formation in various environment and criteria governing the molecular mobility at nanoscale is of high importance to various fields of applications. Using neutron spectroscopy as a powerful nanoscope we have investigated molecular dynamics of water in hydrophobic and hydrophilic nanoconfinement in a very broad temperature range of 20-300 K. By an aimed selection of the confining systems we were able to follow the molecular behavior in pores of various sizes and in environments with variable degrees of water - host interactions. Changing the amount of confined water allowed us an additional systematic insight. Thus, in hydrophobic zeolite AlPO4-5 we have found pronounced adsorption induced structural contraction as a result of guest-host interactions. Furthermore, with the evolution of the growing water network and increasing guest-guest interactions we observe non-linear changes of the mean square displacement, experimentally determined on the picosecond time scale.