Molecular Resolution of the Water Interface at an Alkali Halide with Terraces and Steps

No Thumbnail Available
Journal Title
Journal ISSN
Volume Title
A2 Katsausartikkeli tieteellisessä aikakauslehdessä
This publication is imported from Aalto University research portal.
View publication in the Research portal

Other link related to publication
Degree programme
Journal of Physical Chemistry C, Volume 120, issue 35
Hydration structures at crystal surfaces play important roles in crystal growth or dissolution processes in liquid environments. Recently developed two-dimensional (2D) and three-dimensional (3D) force mapping techniques using frequency-modulation atomic force microscopy (FM-AFM) allow us to visualize the hydration structures at the solid-liquid interfaces at angstrom-scale resolution in real space. Up to now, the experimental and theoretical studies on local hydration structures have mainly focused on those on the terrace, but little work has looked at step edges, usually the key areas in dissolution and growth. In this study, we measured local hydration structures on water-soluble alkali halide crystal surfaces by 2D force mapping FM-AFM. The atomic-scale hydration structures observed on the terraces agree well with molecular-dynamics (MD) simulations. We also measured the hydration structures at the step edge of the NaCl(001) surface, which was constantly dissolving and growing, leading to the clear observation of atomic fluctuations. We found, with the support of MD simulations, that the hydration structures measured by FM-AFM at a time scale of a minute can be interpreted as the time-average of the hydration structures on the upper terrace and those on the lower terrace.
| openaire: EC/FP7/610446/EU//PAMS
Other note
Ito , F , Kobayashi , K , Spijker , P , Zivanovic , L , Umeda , K , Nurmi , T , Holmberg , N , Laasonen , K , Foster , A S & Yamada , H 2016 , ' Molecular Resolution of the Water Interface at an Alkali Halide with Terraces and Steps ' , Journal of Physical Chemistry C , vol. 120 , no. 35 , pp. 19714-19722 .