A Low-Temperature Crossover in Water Dynamics in an Aqeous LiCl Solution: Diffusion Probed by Neutron Spin-Echo and Nuclear Magnetic Resonance
Antonio Faraone, E. W. Hagaman, K. S. Han, Emiliano Fratini
Aqueous solutions of lithium chloride are an excellent model system for studying the dynamics of water molecules down to low temperatures without freezing. The apparent dynamic crossover observed in an aqueous solution of LiCl at about 220 K - 225 K [Mamontov, JPCB 2009, 113,14073] is located practically at the same temperature as the crossover found for pure water confined in small hydrophilic pores. This finding suggests a strong similarity of water behavior in these two types of systems. At the same time, the latter allows more effective explorations of the long-range diffusion dynamics, because the water molecules are not confined inside an impenetrable matrix. In contrast to the earlier incoherent quasielastic neutron scattering (QENS) results obtained for the scattering momentum transfers of 0.3 Å-1
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A Low-Temperature Crossover in Water Dynamics in an Aqeous LiCl Solution: Diffusion Probed by Neutron Spin-Echo and Nuclear Magnetic Resonance, Journal of Physical Chemistry, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=906774
(Accessed December 2, 2023)