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

Tutkimustuotos: Lehtiartikkelivertaisarvioitu

Tutkijat

  • Fumiaki Ito
  • Kei Kobayashi
  • Peter Spijker
  • Lidija Zivanovic
  • Kenichi Umeda
  • Tarmo Nurmi
  • Nico Holmberg
  • Kari Laasonen

  • Adam Foster

  • Hirofumi Yamada

Organisaatiot

  • Kyoto University
  • Kanazawa University

Kuvaus

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.

Yksityiskohdat

AlkuperäiskieliEnglanti
Sivut19714-19722
Sivumäärä9
JulkaisuJournal of Physical Chemistry C
Vuosikerta120
Numero35
TilaJulkaistu - 8 syyskuuta 2016
OKM-julkaisutyyppiA2 Arvio tiedejulkaisuussa (artikkeli)

ID: 7522680