The structure and terahertz dynamics of water confined in nanoscale pools in salt solutions

Turton, D.A., Corsaro, C., Candelaresi, M., Brownlie, A., Seddon, K.R., Mallamace, F. and Wynne, K. (2011) The structure and terahertz dynamics of water confined in nanoscale pools in salt solutions. Faraday Discussions, 150, pp. 493-504. (doi:10.1039/c0fd00005a)

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Publisher's URL: http://dx.doi.org/10.1039/c0fd00005a

Abstract

The behaviour of liquid water below its melting point is of great interest as it may hold clues to the properties of normal liquid water and of water in and on the surfaces of biomolecules. A second critical point, giving rise to a polyamorphic transition between high and low density water, may be hidden in the supercooled region but cannot be observed directly. Here it is shown that water can be locked up in nano-pools or worm-like structures using aqueous LiCl salt solutions and can be studied with terahertz spectroscopies. Very high dynamic range ultrafast femtosecond optical Kerr effect (OKE) spectroscopy is used to study the temperature-dependent behaviour of water in these nano-pools on timescales from 10 fs to 4 ns. These experiments are complemented by temperature-dependent nuclear magnetic resonance (NMR) diffusion measurements, concentration-dependent Fourier-transform infrared (FTIR) measurements, and temperature-dependent rheology. It is found that liquid water in the nanoscale pools undergoes a fragile-to-strong transition at about 220 K associated with a sharp increase in the inhomogeneity of translational dynamics.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Turton, Dr David and Wynne, Professor Klaas
Authors: Turton, D.A., Corsaro, C., Candelaresi, M., Brownlie, A., Seddon, K.R., Mallamace, F., and Wynne, K.
Subjects:Q Science > QD Chemistry
College/School:College of Science and Engineering > School of Chemistry
Journal Name:Faraday Discussions
Publisher:Royal Society of Chemistry
ISSN:1359-6640
ISSN (Online):1364-5498
Published Online:05 May 2011

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
559071Two-dimensional terahertz/IR spectroscopy: a unique probe of ultrafast hydrogen-bond dynamics of liquid water and model systems.Klaas WynneEngineering & Physical Sciences Research Council (EPSRC)EP/F06926X/1CHEM - CHEMISTRY
571341Liquid-liquid transitions in molecular liquids: from supramolecular structure to phase separationKlaas WynneEngineering & Physical Sciences Research Council (EPSRC)EP/J004790/1CHEM - CHEMISTRY
563561Terahertz spectroscopy of aqueous ionic solutions to understand the role of hydrogen-bond network breaking and strengthening in the HofmeisterKlaas WynneEngineering & Physical Sciences Research Council (EPSRC)EP/E046541/1CHEM - CHEMISTRY
582891The structure and dynamics of water confined in nanoscale pools: the dynamic crossoverKlaas WynneEngineering & Physical Sciences Research Council (EPSRC)EP/J009733/1CHEM - CHEMISTRY