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Title: 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:
 [1];  [2];  [3];  [4];  [3];  [3]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
  2. Univ. of Illinois, Chicago, IL (United States)
  3. Argonne National Lab. (ANL), Argonne, IL (United States)
  4. Univ. of Delaware, Newark, DE (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (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 Volume: 349; Journal Issue: 6254; Journal ID: ISSN 0036-8075
Publisher:
AAAS
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; X-ray microscopy; mineral/aqueous interfaces

Citation Formats

Laanait, Nouamane, Callagon, Erika Blanca R., Zhang, Zhan, Sturchio, Neil C., Lee, Sang Soo, and Fenter, Paul. X-ray driven reaction front dynamics at calcite-water interfaces. United States: N. p., 2015. Web. doi:10.1126/science.aab3272.
Laanait, Nouamane, Callagon, Erika Blanca R., Zhang, Zhan, Sturchio, Neil C., Lee, Sang Soo, & Fenter, Paul. X-ray driven reaction front dynamics at calcite-water interfaces. United States. doi:10.1126/science.aab3272.
Laanait, Nouamane, Callagon, Erika Blanca R., Zhang, Zhan, Sturchio, Neil C., Lee, Sang Soo, and Fenter, Paul. Fri . "X-ray driven reaction front dynamics at calcite-water interfaces". United States. doi:10.1126/science.aab3272.
@article{osti_1355825,
title = {X-ray driven reaction front dynamics at calcite-water interfaces},
author = {Laanait, Nouamane and Callagon, Erika Blanca R. and Zhang, Zhan and Sturchio, Neil C. and Lee, Sang Soo and Fenter, Paul},
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 = {2015},
month = {9}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1126/science.aab3272

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Cited by: 14 works
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