Water Mobility in the Interfacial Liquid Layer of Ice/Clay Nanocomposites

Autor(en)

Hailong Li, Julian Mars, Wiebke Lohstroh, Michael Marek Koza, Hans‐Jürgen Butt, Markus Mezger

Abstrakt

At solid/ice interfaces, a premelting layer is formed at temperatures below the melting point of bulk water. However, the structural and dynamic properties within the premelting layer have been a topic of intense debate. Herein, we determined the translational diffusion coefficient D-t of water in ice/clay nanocomposites serving as model systems for permafrost by quasi-elastic neutron scattering. Below the bulk melting point, a rapid decrease of D-t is found for charged hydrophilic vermiculite, uncharged hydrophilic kaolin, and more hydrophobic talc, reaching plateau values below -4 degrees C. At this temperature, D-t in the premelting layer is reduced up to a factor of two compared to supercooled bulk water. Adjacent to charged vermiculite the lowest water mobility was observed, followed by kaolin and the more hydrophobic talc. Results are explained by the intermolecular water interactions with different clay surfaces and interfacial segregation of the low-density liquid water (LDL) component.

Organisation(en)

Dynamik Kondensierter Systeme

Externe Organisation(en)

Max-Planck-Institut für Polymerforschung, Technische Universität München, Institut Laue-Langevin (ILL)

Journal

Angewandte Chemie International Edition

Band

60

Seiten

7697-7702

Anzahl der Seiten

6

DOI

https://doi.org/10.1002/anie.202013125

Publikationsdatum

03-2021

Peer-reviewed

Ja

ÖFOS 2012

103015 Kondensierte Materie, 103006 Chemische Physik

Schlagwörter

ASJC Scopus Sachgebiete

Allgemeine Chemie, Catalysis

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/396c0163-d392-4cb0-8fcb-522c7cd3b641