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

David A. Turton; Carmelo Corsaro; Marco Candelaresi; Angela Brownlie; Ken R. Seddon; Francesco Mallamace; Klaas Wynne

doi:10.1039/C0FD00005A

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Faraday Discussions

Issue 0, 2011

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

David A. Turton,^a^b Carmelo Corsaro,^c Marco Candelaresi,^a Angela Brownlie,^d Ken R. Seddon,^d Francesco Mallamace^c^e and Klaas Wynne*^a^b

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School of Chemistry, WestCHEM, University of Glasgow, UK
E-mail: klaas.wynne@glasgow.ac.uk

Dept. of Physics, SUPA, University of Strathclyde, Glasgow, UK

Dipartimento di Fisica, Universita di Messina, Italy

School of Chemistry and Chemical Engineering, Queen's University Belfast, UK

Dept. of Nuclear Science and Engineering, Massachusetts Institute of Technology, Cambridge, USA

Faraday Discuss., 2011,150, 493-504

DOI: 10.1039/C0FD00005A
Received 26 Nov 2010, Accepted 11 Jan 2011
First published online 05 May 2011

This article is part of themed collection: Frontiers in Spectroscopy

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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.

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David A. Turton
Carmelo Corsaro
Marco Candelaresi
Angela Brownlie
Ken R. Seddon
Francesco Mallamace
Klaas Wynne

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