Molecular simulation of water confined in nanoporous Ca-silica

Patrick A. Bonnaud, Benoît Coasne, Roland J.M. Pellenq

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This paper reports on a molecular simulation study of the thermodynamics, structure and dynamics of water confined at ambient temperature in charged silica nanopores of a width H = 10 and 20 Å. The adsorption isotherms for water resemble those observed for experimental samples; the adsorbed amount increases continuously in the multilayer adsorption regime until a jump occurs due to capillary condensation of the fluid within the pore. Strong layering of water in the vicinity of the silica surfaces is observed as marked density oscillations are seen up to 8 Å from the surface in the density profiles for confined water. Our results also indicate that the Ca2+ counterions remain in a space close to the silica surface whatever the pore width and the adsorbed amount of water. For all pore sizes and adsorbed amounts, the self-diffusivity of confined water is lower than the bulk due to the strong hydrophilic nature of the pore surface. Our results also suggest that the self-diffusivity of confined water is sensitive to the adsorbed amount of water molecules.

Original languageEnglish
Title of host publicationMultiscale Dynamics in Confining Systems
PublisherMaterials Research Society
Pages7-18
Number of pages12
ISBN (Print)9781617387586
Publication statusPublished - 2010 Jan 1

Publication series

NameMaterials Research Society Symposium Proceedings
Volume1227
ISSN (Print)0272-9172

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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