Jump to main content
Jump to site search

Issue 26, 2013
Previous Article Next Article

Slow dynamics of water molecules in an aqueous solution of lithium chloride probed by neutron spin-echo

Author affiliations

Abstract

Aqueous solutions of lithium chloride are uniquely similar to pure water in the parameters such as glass transition temperature, Tg, yet they could be supercooled without freezing down to below 200 K even in the bulk state. This provides advantageous opportunity to study low-temperature dynamics of water molecules in water-like environment in the bulk rather than nano-confined state. Using high-resolution neutron spin-echo data, we argue that the critical temperature, Tc, which is also common between lithium chloride aqueous solutions and pure water, is associated with the split of a secondary relaxation from the main structural relaxation on cooling down. Our results do not allow distinguishing between a well-defined separate secondary relaxation process and the “excess wing” scenario, in which the temperature dependence of the secondary relaxation follows the main relaxation. Importantly, however, in either of these scenarios the secondary relaxation is associated with density–density fluctuations, measurable in a neutron scattering experiment. Neutron scattering could be the only experimental technique with the capability of providing information on the spatial characteristics of the secondary relaxation through the dependence of the signal on the scattering momentum transfer. We propose a simple method for such analysis.

Graphical abstract: Slow dynamics of water molecules in an aqueous solution of lithium chloride probed by neutron spin-echo

Back to tab navigation
Please wait while Download options loads

Publication details

The article was received on 30 Mar 2013, accepted on 13 May 2013 and first published on 14 May 2013


Article type: Paper
DOI: 10.1039/C3CP51355F
Citation: Phys. Chem. Chem. Phys., 2013,15, 10732-10739
  •   Request permissions

    Slow dynamics of water molecules in an aqueous solution of lithium chloride probed by neutron spin-echo

    E. Mamontov and M. Ohl, Phys. Chem. Chem. Phys., 2013, 15, 10732
    DOI: 10.1039/C3CP51355F

Search articles by author