X-Ray Reflectivity Analysis of SiO2 Nanochannels Filled with Water and Ions: A New Method for the Determination of the Spatial Distribution of Ions Inside Confined Media

Abstract : Chemical reactions occurring at the material–aqueous solution interface are controlled by an interfacial layer of a few nm where conceptual models such as the Electrical Double or Triple Layer models can be applied. These models describing the spatial distribution of ions in term of perpendicular distance from the planar surface and ignoring topography or structure parallel to the surface are not validated in confined media. In order to investigate the critical dimensions of these models, our first approach was to use a model system consisting of two parallel plane surfaces of SiO 2 spaced of 5 nm (nanochannels) filled with salt solutions XCl 2 (X = Ca 2+ , Mg 2+ , Ba 2+). These filled nanochannels were characterized using hard X-Ray reflectivity for the determination of electron density profiles perpendicular to the surface. From these results, the surface densities of adsorbed ions at SiO 2 surface were calculated and the solution density inside the nanochannels was determined. This method opens new perspectives to a better understanding of water and ion distribution inside nanoconfined media.
Document type :
Journal articles
Complete list of metadatas

Cited literature [5 references]  Display  Hide  Download

https://hal-insu.archives-ouvertes.fr/insu-01440178
Contributor : Nathalie Pothier <>
Submitted on : Thursday, January 19, 2017 - 8:32:01 AM
Last modification on : Tuesday, October 15, 2019 - 4:42:01 PM
Long-term archiving on : Thursday, April 20, 2017 - 12:46:18 PM

File

Baum-Procedia-2017.pdf
Publisher files allowed on an open archive

Identifiers

Citation

F Baum, Diane Rébiscoul, S Tardif, N Tas, Lionel Mercury, et al.. X-Ray Reflectivity Analysis of SiO2 Nanochannels Filled with Water and Ions: A New Method for the Determination of the Spatial Distribution of Ions Inside Confined Media. Procedia Earth and Planetary Science, Elsevier, 2017, 15th Water-Rock Interaction International Symposium, WRI-15, 17, pp.682 - 685. ⟨10.1016/j.proeps.2016.12.146⟩. ⟨insu-01440178⟩

Share

Metrics

Record views

600

Files downloads

171