Issue 29, 2022

Confinement induces stable calcium carbonate formation in silica nanopores

Abstract

Scalable efforts to remove anthropogenic CO2via the formation of durable carbonates require us to harness siliceous nanoporous geologic materials for carbon storage. While calcium carbonate formation has been extensively reported in bulk fluids, there is a limited understanding of the influence of nanoconfined fluids on the formation of specific stable and metastable polymorphs of calcium carbonates in siliceous materials that are abundant in subsurface environments. To address this challenge, silica nanochannels with diameters of 3.7 nm are architected and the formation of specific calcium carbonate phases is investigated using X-ray diffraction (XRD), and molecular dynamics (MD) simulations. The formation of stable calcium carbonate (or calcite) is noted in silica nanochannels. The presence of fewer water molecules in the first hydration shell of calcium ions in confinement compared to in bulk fluids contributes to stable calcium carbonate formation. These studies show that nanoporous siliceous environments favor the formation of stable calcium carbonate formation.

Graphical abstract: Confinement induces stable calcium carbonate formation in silica nanopores

Supplementary files

Article information

Article type
Paper
Submitted
02 Apr. 2022
Accepted
17 Jūn. 2022
First published
21 Jūn. 2022

Nanoscale, 2022,14, 10349-10359

Author version available

Confinement induces stable calcium carbonate formation in silica nanopores

H. Asgar, S. Mohammed and G. Gadikota, Nanoscale, 2022, 14, 10349 DOI: 10.1039/D2NR01834A

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