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Title: Anomalously low activation energy of nanoconfined MgCO3 precipitation

Abstract

Nucleation and growth of bulk magnesite (MgCO3) is well known to be kinetically inhibited at room temperature due to strong hydration of Mg2+. In operando X-ray diffraction was used to follow the temperature dependence of forsterite carbonation to magnesite within the nanoconfined space of adsorbed H2O films ~2 nm thick (~10 monolayers) and determine an apparent activation energy of only 36±6 kJ/mol. This anomalously low value suggests that Mg2+ under nanoconfinement may adopt a hydration configuration that mimics that of aqueous Ca2+, at least energetically, if not also specifically in hydration structure.

Authors:
 [1];  [2]; ORCiD logo [1];  [1];  [1]; ORCiD logo [1]
  1. BATTELLE (PACIFIC NW LAB)
  2. University of Wyoming
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1544785
Report Number(s):
PNNL-SA-141004
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Chemical Communications
Additional Journal Information:
Journal Volume: 55; Journal Issue: 48
Country of Publication:
United States
Language:
English

Citation Formats

Miller, Quin RS, Kaszuba, John, Schaef, Herbert T., Bowden, Mark E., McGrail, Bernard P., and Rosso, Kevin M. Anomalously low activation energy of nanoconfined MgCO3 precipitation. United States: N. p., 2019. Web. doi:10.1039/c9cc01337g.
Miller, Quin RS, Kaszuba, John, Schaef, Herbert T., Bowden, Mark E., McGrail, Bernard P., & Rosso, Kevin M. Anomalously low activation energy of nanoconfined MgCO3 precipitation. United States. doi:10.1039/c9cc01337g.
Miller, Quin RS, Kaszuba, John, Schaef, Herbert T., Bowden, Mark E., McGrail, Bernard P., and Rosso, Kevin M. Tue . "Anomalously low activation energy of nanoconfined MgCO3 precipitation". United States. doi:10.1039/c9cc01337g.
@article{osti_1544785,
title = {Anomalously low activation energy of nanoconfined MgCO3 precipitation},
author = {Miller, Quin RS and Kaszuba, John and Schaef, Herbert T. and Bowden, Mark E. and McGrail, Bernard P. and Rosso, Kevin M.},
abstractNote = {Nucleation and growth of bulk magnesite (MgCO3) is well known to be kinetically inhibited at room temperature due to strong hydration of Mg2+. In operando X-ray diffraction was used to follow the temperature dependence of forsterite carbonation to magnesite within the nanoconfined space of adsorbed H2O films ~2 nm thick (~10 monolayers) and determine an apparent activation energy of only 36±6 kJ/mol. This anomalously low value suggests that Mg2+ under nanoconfinement may adopt a hydration configuration that mimics that of aqueous Ca2+, at least energetically, if not also specifically in hydration structure.},
doi = {10.1039/c9cc01337g},
journal = {Chemical Communications},
number = 48,
volume = 55,
place = {United States},
year = {2019},
month = {6}
}