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Title: Visualising the molecular alteration of the calcite (104) – water interface by sodium nitrate

Journal Article · · Scientific Reports
DOI:https://doi.org/10.1038/srep21576· OSTI ID:1239408
 [1];  [2];  [3];  [4];  [4]
  1. Karlsruhe Inst. of Technology, Eggenstein-Leopoldshafen (Germany)
  2. Durham Univ. (United Kingdom)
  3. Aalto Univ., Helsinki (Finland)
  4. Helmholtz Zentrum Dresden Rossendorf (HZDR), Dresden (Germany)

The reactivity of calcite, one of the most abundant minerals in the earth’s crust, is determined by the molecular details of its interface with the contacting solution. Recently, it has been found that trace concentrations of NaNO3 severely affect calcite’s (104) surface and its reactivity. Here we combine molecular dynamics (MD) simulations, X-ray reflectivity (XR) and in situ atomic force microscopy (AFM) to probe the calcite (104) – water interface in the presence of NaNO3. Simulations reveal density profiles of different ions near calcite’s surface, with NO3 able to reach closer to the surface than CO32– and in higher concentrations. Reflectivity measurements show a structural destabilisation of the (104) surfaces’ topmost atomic layers in NaNO3 bearing solution, with distorted rotation angles of the carbonate groups and substantial displacement of the lattice ions. Nanoscale AFM results confirm the alteration of crystallographic characteristics, and the ability of dissolved NaNO3 to modify the structure of interfacial water was observed by AFM force spectroscopy. Our experiments and simulations consistently evidence a dramatic deterioration of the crystals’ surface, with potentially important implications for geological and industrial processes.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
European Council; German Federal Ministry of Education and Research (BMBF)
Grant/Contract Number:
MC CIG 631186
OSTI ID:
1239408
Journal Information:
Scientific Reports, Vol. 6, Issue 1; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 37 works
Citation information provided by
Web of Science

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Cited By (3)

Recent Insights from Computational Materials Chemistry into Interfaces Relevant to Enhanced Oil Recovery journal February 2019
Thermally-nucleated self-assembly of water and alcohol into stable structures at hydrophobic interfaces journal October 2016
Atomic-resolution three-dimensional hydration structures on a heterogeneously charged surface journal December 2017

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