Two-dimensional hydration shells of alkali metal ions at a hydrophobic surface

Sheng Meng; D V Chakarov; B Kasemo; Shiwu Gao

doi:10.1063/1.1827215

Two-dimensional hydration shells of alkali metal ions at a hydrophobic surface

J Chem Phys. 2004 Dec 22;121(24):12572-6. doi: 10.1063/1.1827215.

Authors

Sheng Meng¹, D V Chakarov, B Kasemo, Shiwu Gao

Affiliation

¹ Department of Applied Physics, Chalmers University of Technology and Göteborg University, SE-412 96 Göteborg, Sweden.

PMID: 15606278
DOI: 10.1063/1.1827215

Abstract

We study the hydration shell formation of alkali metal ions at a graphite surface. Two-dimensional shell structures are found in the initial stage of hydration, in contrast to the three-dimensional structures in bulk water and clusters. Comparison of vibrational spectra with experiments identifies the shell structures and the thermally induced transition from the first to the second shell. We also found intriguing competition between hydration and ion-surface interaction, leading to different solvation dynamics between K and Na. Implications of these results in ionic processes at interfaces are elaborated.