TY - JOUR
T1 - The role of pH and Mg on the stability and crystallization of amorphous calcium carbonate
AU - Rodriguez-Blanco, J. D.
AU - Shaw, S.
AU - Bots, P.
AU - Roncal-Herrero, T.
AU - Benning, L. G.
N1 - cited By (since 1996) 1
PY - 2012/9/25
Y1 - 2012/9/25
N2 - The effects of pH and Mg on the crystallization of amorphous calcium carbonate (ACC) to vaterite and/or calcite were studied using a combination of in situ time resolved synchrotron-based techniques and electron microscopy. The experiments showed that Mg increased the stability of ACC and favoured the formation of calcite over vaterite. A neutral (∼7) starting pH during mixing promoted the transformation of ACC into calcite via a dissolution/ reprecipitation mechanism. Conversely, when ACC formed in a solution that started with a high initial pH (∼11.5), the transformation to calcite occurred via metastable vaterite, which formed via a spherulitic growth mechanism. In a second stage this vaterite transformed to calcite via a surface-controlled dissolution and recrystallization mechanism. These crystallization pathways can be explained as a consequence of the pH-dependent composition, local structure, stability and dissolution rates of ACC. © 2011 Elsevier B.V. All rights reserved.
AB - The effects of pH and Mg on the crystallization of amorphous calcium carbonate (ACC) to vaterite and/or calcite were studied using a combination of in situ time resolved synchrotron-based techniques and electron microscopy. The experiments showed that Mg increased the stability of ACC and favoured the formation of calcite over vaterite. A neutral (∼7) starting pH during mixing promoted the transformation of ACC into calcite via a dissolution/ reprecipitation mechanism. Conversely, when ACC formed in a solution that started with a high initial pH (∼11.5), the transformation to calcite occurred via metastable vaterite, which formed via a spherulitic growth mechanism. In a second stage this vaterite transformed to calcite via a surface-controlled dissolution and recrystallization mechanism. These crystallization pathways can be explained as a consequence of the pH-dependent composition, local structure, stability and dissolution rates of ACC. © 2011 Elsevier B.V. All rights reserved.
KW - Amorphous materials
KW - Crystal growth
KW - Nanostructured materials
KW - Synchrotron radiation
UR - https://www.scopus.com/pages/publications/84863471391
U2 - 10.1016/j.jallcom.2011.11.057
DO - 10.1016/j.jallcom.2011.11.057
M3 - Article
VL - 536
SP - S477-S479
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
IS - 1
ER -