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Title: Nucleation of metastable aragonite CaCO 3 in seawater

Abstract

Predicting the conditions in which a compound adopts a metastable structure when it crystallizes out of solution is an unsolved and fundamental problem in materials synthesis, and one which, if understood and harnessed, could enable the rational design of synthesis pathways toward or away from metastable structures. Crystallization of metastable phases is particularly accessible via low-temperature solution-based routes, such as chimie douce and hydrothermal synthesis, but although the chemistry of the solution plays a crucial role in governing which polymorph forms, how it does so is poorly understood. Here, we demonstrate an ab initio technique to quantify thermodynamic parameters of surfaces and bulks in equilibrium with an aqueous environment, enabling the calculation of nucleation barriers of competing polymorphs as a function of solution chemistry, thereby predicting the solution conditions governing polymorph selection. We apply this approach to resolve the long-standing "calcite-aragonite problem" - the observation that calcium carbonate precipitates as the metastable aragonite polymorph in marine environments, rather than the stable phase calcite - which is of tremendous relevance to biomineralization, carbon sequestration, paleogeochemistry, and the vulnerability of marine life to ocean acidification. We identify a direct relationship between the calcite surface energy and solution Mg-Ca ion concentrations, showing thatmore » the calcite nucleation barrier surpasses that of metastable aragonite in solutions with Mg:Ca ratios consistent with modern seawater, allowing aragonite to dominate the kinetics of nucleation. Our ability to quantify how solution parameters distinguish between polymorphs marks an important step toward the ab initio prediction of materials synthesis pathways in solution.« less

Authors:
; ; ; ;
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1235156
Alternate Identifier(s):
OSTI ID: 1221824; OSTI ID: 1221825; OSTI ID: 1512178
Grant/Contract Number:  
FG02-96ER45571; AC02-98CH10886; AC02-05CH11231; EDCBEE
Resource Type:
Published Article
Journal Name:
Proceedings of the National Academy of Sciences of the United States of America
Additional Journal Information:
Journal Name: Proceedings of the National Academy of Sciences of the United States of America Journal Volume: 112 Journal Issue: 11; Journal ID: ISSN 0027-8424
Publisher:
National Academy of Sciences, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY; nucleation; calcium carbonate; polymorphism; surface energy; solid solution–aqueous solution equilibria; 36 MATERIALS SCIENCE

Citation Formats

Sun, Wenhao, Jayaraman, Saivenkataraman, Chen, Wei, Persson, Kristin A., and Ceder, Gerbrand. Nucleation of metastable aragonite CaCO 3 in seawater. United States: N. p., 2015. Web. doi:10.1073/pnas.1423898112.
Sun, Wenhao, Jayaraman, Saivenkataraman, Chen, Wei, Persson, Kristin A., & Ceder, Gerbrand. Nucleation of metastable aragonite CaCO 3 in seawater. United States. https://doi.org/10.1073/pnas.1423898112
Sun, Wenhao, Jayaraman, Saivenkataraman, Chen, Wei, Persson, Kristin A., and Ceder, Gerbrand. Wed . "Nucleation of metastable aragonite CaCO 3 in seawater". United States. https://doi.org/10.1073/pnas.1423898112.
@article{osti_1235156,
title = {Nucleation of metastable aragonite CaCO 3 in seawater},
author = {Sun, Wenhao and Jayaraman, Saivenkataraman and Chen, Wei and Persson, Kristin A. and Ceder, Gerbrand},
abstractNote = {Predicting the conditions in which a compound adopts a metastable structure when it crystallizes out of solution is an unsolved and fundamental problem in materials synthesis, and one which, if understood and harnessed, could enable the rational design of synthesis pathways toward or away from metastable structures. Crystallization of metastable phases is particularly accessible via low-temperature solution-based routes, such as chimie douce and hydrothermal synthesis, but although the chemistry of the solution plays a crucial role in governing which polymorph forms, how it does so is poorly understood. Here, we demonstrate an ab initio technique to quantify thermodynamic parameters of surfaces and bulks in equilibrium with an aqueous environment, enabling the calculation of nucleation barriers of competing polymorphs as a function of solution chemistry, thereby predicting the solution conditions governing polymorph selection. We apply this approach to resolve the long-standing "calcite-aragonite problem" - the observation that calcium carbonate precipitates as the metastable aragonite polymorph in marine environments, rather than the stable phase calcite - which is of tremendous relevance to biomineralization, carbon sequestration, paleogeochemistry, and the vulnerability of marine life to ocean acidification. We identify a direct relationship between the calcite surface energy and solution Mg-Ca ion concentrations, showing that the calcite nucleation barrier surpasses that of metastable aragonite in solutions with Mg:Ca ratios consistent with modern seawater, allowing aragonite to dominate the kinetics of nucleation. Our ability to quantify how solution parameters distinguish between polymorphs marks an important step toward the ab initio prediction of materials synthesis pathways in solution.},
doi = {10.1073/pnas.1423898112},
journal = {Proceedings of the National Academy of Sciences of the United States of America},
number = 11,
volume = 112,
place = {United States},
year = {Wed Mar 04 00:00:00 EST 2015},
month = {Wed Mar 04 00:00:00 EST 2015}
}

Journal Article:
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https://doi.org/10.1073/pnas.1423898112

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