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 journalArticlepeer-review


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 languageEnglish (US)
Article number26001
Issue number2
StatePublished - Jul 2012
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy


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