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Glass transition temperatures and crystallization kinetics of a synthetic, anhydrous, amorphous calcium-magnesium carbonate

We report the first calorimetric observations of glass transition temperatures and crystallization rates of anhydrous, amorphous calcium-magnesium carbonate using fast scanning differential scanning calorimetry. Hydrous amorphous Ca(0.95)Mg(0.05)CO(3) · 0.5H(2)O (ACMC) solid was precipitated from a...

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Autores principales: Hess, Kai-Uwe, Schawe, Jürgen E. K., Wilding, Martin, Purgstaller, Bettina, Goetschl, Katja E., Sturm, Sebastian, Müller-Caspary, Knut, Sturm, Elena V., Schmahl, Wolfgang, Griesshaber, Erika, Bissbort, Thilo, Weidendorfer, Daniel, Dietzel, Martin, Dingwell, Donald B.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10460641/
https://www.ncbi.nlm.nih.gov/pubmed/37634535
http://dx.doi.org/10.1098/rsta.2022.0356
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author Hess, Kai-Uwe
Schawe, Jürgen E. K.
Wilding, Martin
Purgstaller, Bettina
Goetschl, Katja E.
Sturm, Sebastian
Müller-Caspary, Knut
Sturm, Elena V.
Schmahl, Wolfgang
Griesshaber, Erika
Bissbort, Thilo
Weidendorfer, Daniel
Dietzel, Martin
Dingwell, Donald B.
author_facet Hess, Kai-Uwe
Schawe, Jürgen E. K.
Wilding, Martin
Purgstaller, Bettina
Goetschl, Katja E.
Sturm, Sebastian
Müller-Caspary, Knut
Sturm, Elena V.
Schmahl, Wolfgang
Griesshaber, Erika
Bissbort, Thilo
Weidendorfer, Daniel
Dietzel, Martin
Dingwell, Donald B.
author_sort Hess, Kai-Uwe
collection PubMed
description We report the first calorimetric observations of glass transition temperatures and crystallization rates of anhydrous, amorphous calcium-magnesium carbonate using fast scanning differential scanning calorimetry. Hydrous amorphous Ca(0.95)Mg(0.05)CO(3) · 0.5H(2)O (ACMC) solid was precipitated from a MgCl(2)–NaHCO(3) buffered solution, separated from the supernatant, and freeze-dried. An aliquot of the freeze-dried samples was additionally dried at 250°C for up to 6 h in a furnace and in a high-purity N(2) atmosphere to produce anhydrous ACMC. The glass transition temperature of the anhydrous Ca(0.95)Mg(0.05)CO(3) was determined by applying different heating rates (1000–6000 K s(−1)) and correcting for thermal lag to be 376°C and the relaxational heat capacity was determined to be Cp = 0.16 J/(g K). Additionally, the heating rate dependence of the temperature that is associated with the corrected crystallization peaks is used to determine the activation energy of crystallization to be 275 kJ mol(−1). A high-resolution transmission electron microscopy study on the hydrous and anhydrous samples provided further constraints on their compositional and structural states. This article is part of the theme issue 'Exploring the length scales, timescales and chemistry of challenging materials (Part 1)'.
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spelling pubmed-104606412023-08-28 Glass transition temperatures and crystallization kinetics of a synthetic, anhydrous, amorphous calcium-magnesium carbonate Hess, Kai-Uwe Schawe, Jürgen E. K. Wilding, Martin Purgstaller, Bettina Goetschl, Katja E. Sturm, Sebastian Müller-Caspary, Knut Sturm, Elena V. Schmahl, Wolfgang Griesshaber, Erika Bissbort, Thilo Weidendorfer, Daniel Dietzel, Martin Dingwell, Donald B. Philos Trans A Math Phys Eng Sci Articles We report the first calorimetric observations of glass transition temperatures and crystallization rates of anhydrous, amorphous calcium-magnesium carbonate using fast scanning differential scanning calorimetry. Hydrous amorphous Ca(0.95)Mg(0.05)CO(3) · 0.5H(2)O (ACMC) solid was precipitated from a MgCl(2)–NaHCO(3) buffered solution, separated from the supernatant, and freeze-dried. An aliquot of the freeze-dried samples was additionally dried at 250°C for up to 6 h in a furnace and in a high-purity N(2) atmosphere to produce anhydrous ACMC. The glass transition temperature of the anhydrous Ca(0.95)Mg(0.05)CO(3) was determined by applying different heating rates (1000–6000 K s(−1)) and correcting for thermal lag to be 376°C and the relaxational heat capacity was determined to be Cp = 0.16 J/(g K). Additionally, the heating rate dependence of the temperature that is associated with the corrected crystallization peaks is used to determine the activation energy of crystallization to be 275 kJ mol(−1). A high-resolution transmission electron microscopy study on the hydrous and anhydrous samples provided further constraints on their compositional and structural states. This article is part of the theme issue 'Exploring the length scales, timescales and chemistry of challenging materials (Part 1)'. The Royal Society 2023-10-16 2023-08-28 /pmc/articles/PMC10460641/ /pubmed/37634535 http://dx.doi.org/10.1098/rsta.2022.0356 Text en © 2023 The Authors. https://creativecommons.org/licenses/by/4.0/Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, provided the original author and source are credited.
spellingShingle Articles
Hess, Kai-Uwe
Schawe, Jürgen E. K.
Wilding, Martin
Purgstaller, Bettina
Goetschl, Katja E.
Sturm, Sebastian
Müller-Caspary, Knut
Sturm, Elena V.
Schmahl, Wolfgang
Griesshaber, Erika
Bissbort, Thilo
Weidendorfer, Daniel
Dietzel, Martin
Dingwell, Donald B.
Glass transition temperatures and crystallization kinetics of a synthetic, anhydrous, amorphous calcium-magnesium carbonate
title Glass transition temperatures and crystallization kinetics of a synthetic, anhydrous, amorphous calcium-magnesium carbonate
title_full Glass transition temperatures and crystallization kinetics of a synthetic, anhydrous, amorphous calcium-magnesium carbonate
title_fullStr Glass transition temperatures and crystallization kinetics of a synthetic, anhydrous, amorphous calcium-magnesium carbonate
title_full_unstemmed Glass transition temperatures and crystallization kinetics of a synthetic, anhydrous, amorphous calcium-magnesium carbonate
title_short Glass transition temperatures and crystallization kinetics of a synthetic, anhydrous, amorphous calcium-magnesium carbonate
title_sort glass transition temperatures and crystallization kinetics of a synthetic, anhydrous, amorphous calcium-magnesium carbonate
topic Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10460641/
https://www.ncbi.nlm.nih.gov/pubmed/37634535
http://dx.doi.org/10.1098/rsta.2022.0356
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