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

ABSTRACT: 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 °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

SUBMITTER: Li H 

PROVIDER: S-EPMC8048683 | biostudies-literature | 2021 Mar

REPOSITORIES: biostudies-literature