Abstract
Resistance to heating above the boiling point of water of the molecular structure of a single-charged sodium cation hydration shell growing under the conditions of a model planar nanopore with a width of 5 Å is studied by computer simulation. Monte Carlo calculations of spatial correlation functions are performed in a detailed model with regard to many-body interactions between the ion and water molecules. The system demonstrates an increased resistance to thermal fluctuations along the pore plane and a decreased one in the transverse direction. The heating is accompanied by an enhanced coating effect of molecules around the ion and a diminished effect of extruding the ion out of its own hydration shell. The orientational molecular order due to strong spatial anisotropy inside the nanopore is much more stable than the hydrogen bonds between the molecules.
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Shevkunov, S.V. Structure of a Na+ cation hydration shell on heating in a planar nanopore. J Struct Chem 58, 1368–1376 (2017). https://doi.org/10.1134/S0022476617070137
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DOI: https://doi.org/10.1134/S0022476617070137