Density profile of water in nanoslit

S. Chodankar; E. Perret; K. Nygård; O. Bunk; D. K. Satapathy; R. M. Espinosa Marzal; T. E. Balmer; M. Heuberger; J. F. Van Der Veen

doi:10.1209/0295-5075/99/26001

Density profile of water in nanoslit

S. Chodankar, E. Perret, K. Nygård, O. Bunk, D. K. Satapathy, R. M. Espinosa Marzal, T. E. Balmer, M. Heuberger, J. F. Van Der Veen

Research output: Contribution to journal › Article › peer-review

Abstract

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 (1.7-1.9nm) 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.

Original language	English (US)
Article number	26001
Journal	EPL
Volume	99
Issue number	2
DOIs	https://doi.org/10.1209/0295-5075/99/26001
State	Published - Jul 2012
Externally published	Yes

ASJC Scopus subject areas

General Physics and Astronomy

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10.1209/0295-5075/99/26001

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AU - Chodankar, S.

AU - Perret, E.

AU - Nygård, K.

AU - Bunk, O.

AU - Satapathy, D. K.

AU - Espinosa Marzal, R. M.

AU - Balmer, T. E.

AU - Heuberger, M.

AU - Van Der Veen, J. F.

PY - 2012/7

Y1 - 2012/7

N2 - 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 (1.7-1.9nm) 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.

AB - 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 (1.7-1.9nm) 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.

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Density profile of water in nanoslit

Abstract

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