X-ray-driven reaction front dynamics at calcite-water interfaces
Abstract
The interface of minerals with aqueous solutions is central to geochemical reactivity, hosting processes that span multiple spatiotemporal scales. Understanding such processes requires spatially and temporally resolved observations, and experimental controls that precisely manipulate the interfacial thermodynamic state. Using the intense radiation fields of a focused synchrotron X-ray beam, we drove dissolution at the calcite-aqueous interface and simultaneously probed the dynamics of the propagating reaction fronts using surface X-ray microscopy. Evolving surface structures are controlled by the time-dependent solution composition as characterized by a kinetic reaction model. At extreme disequilibria, the onset of reaction front instabilities was observed with velocities of >30 nanometers per second. As a result, these instabilities are identified as a signature of transport-limited dissolution of calcite under extreme disequilibrium.
- Authors:
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1355825
- Alternate Identifier(s):
- OSTI ID: 1234334
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Published Article
- Journal Name:
- Science
- Additional Journal Information:
- Journal Name: Science Journal Volume: 349 Journal Issue: 6254; Journal ID: ISSN 0036-8075
- Publisher:
- American Association for the Advancement of Science (AAAS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; X-ray microscopy; mineral/aqueous interfaces
Citation Formats
Laanait, N., Callagon, E. B. R., Zhang, Z., Sturchio, N. C., Lee, S. S., and Fenter, P. X-ray-driven reaction front dynamics at calcite-water interfaces. United States: N. p., 2015.
Web. doi:10.1126/science.aab3272.
Laanait, N., Callagon, E. B. R., Zhang, Z., Sturchio, N. C., Lee, S. S., & Fenter, P. X-ray-driven reaction front dynamics at calcite-water interfaces. United States. https://doi.org/10.1126/science.aab3272
Laanait, N., Callagon, E. B. R., Zhang, Z., Sturchio, N. C., Lee, S. S., and Fenter, P. Thu .
"X-ray-driven reaction front dynamics at calcite-water interfaces". United States. https://doi.org/10.1126/science.aab3272.
@article{osti_1355825,
title = {X-ray-driven reaction front dynamics at calcite-water interfaces},
author = {Laanait, N. and Callagon, E. B. R. and Zhang, Z. and Sturchio, N. C. and Lee, S. S. and Fenter, P.},
abstractNote = {The interface of minerals with aqueous solutions is central to geochemical reactivity, hosting processes that span multiple spatiotemporal scales. Understanding such processes requires spatially and temporally resolved observations, and experimental controls that precisely manipulate the interfacial thermodynamic state. Using the intense radiation fields of a focused synchrotron X-ray beam, we drove dissolution at the calcite-aqueous interface and simultaneously probed the dynamics of the propagating reaction fronts using surface X-ray microscopy. Evolving surface structures are controlled by the time-dependent solution composition as characterized by a kinetic reaction model. At extreme disequilibria, the onset of reaction front instabilities was observed with velocities of >30 nanometers per second. As a result, these instabilities are identified as a signature of transport-limited dissolution of calcite under extreme disequilibrium.},
doi = {10.1126/science.aab3272},
journal = {Science},
number = 6254,
volume = 349,
place = {United States},
year = {Thu Sep 17 00:00:00 EDT 2015},
month = {Thu Sep 17 00:00:00 EDT 2015}
}
https://doi.org/10.1126/science.aab3272
Web of Science
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