Volume 99, Number 2, July 2012
|Number of page(s)||5|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||19 July 2012|
Density profile of water in nanoslit
1 Paul Scherrer Institut - 5232 Villigen PSI, Switzerland
2 Université Fribourg - 1700 Fribourg, Switzerland
3 ETH Zürich - 8093 Zürich, Switzerland
4 EMPA - 9014 St. Gallen, Switzerland
Received: 13 February 2012
Accepted: 20 June 2012
Confined water is abundant in the narrow pores of soil, clay, rock and biological systems. The water molecules are expected to assume layered structures between the confining surfaces, but details on the ordering behavior are lacking. In this letter we report density profiles of water across a narrow gap (1.7–1.9 nm) between cleaved mica surfaces studied using X-ray reflectivity. The profiles show pronounced electron density modulations within the gap. These indicate a partial hydration of cations (K+) on the mica surfaces and full hydration of desorbed cations within the gap. The average density of the confined water is close to that of bulk water.
PACS: 61.25.Em – Molecular liquids / 68.08.-p – Liquid-solid interfaces / 61.05.cf – X-ray scattering (including small-angle scattering)
© EPLA, 2012
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