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Real-Time Observation of CaCO₃ Mineralization in Highly Supersaturated Graphene Liquid Cells.

ABSTRACT: The mineralization dynamics of calcium carbonate is investigated under highly supersaturated conditions using graphene liquid cell transmission electron microscopy. We demonstrate that the mineralization process has three steps: nucleation, diffusion-limited growth, and Ostwald ripening/coalescence. In addition, we show that the polymorphs precipitate in a specific order, from metastable aragonite to stable calcite, thus proving Ostwald's rule of stages. In highly supersaturated solutions, the aragonite phase crystallizes in a stable manner, in addition to the calcite phase.

SUBMITTER: Dae KS

PROVIDER: S-EPMC7315570 | biostudies-literature | 2020 Jun

REPOSITORIES: biostudies-literature

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Real-Time Observation of CaCO<sub>3</sub> Mineralization in Highly Supersaturated Graphene Liquid Cells.

Dae Kyun Seong KS Chang Joon Ha JH Koo Kunmo K Park Jungjae J Kim Jae Sung JS Yuk Jong Min JM

ACS omega 20200610 24

The mineralization dynamics of calcium carbonate is investigated under highly supersaturated conditions using graphene liquid cell transmission electron microscopy. We demonstrate that the mineralization process has three steps: nucleation, diffusion-limited growth, and Ostwald ripening/coalescence. In addition, we show that the polymorphs precipitate in a specific order, from metastable aragonite to stable calcite, thus proving Ostwald's rule of stages. In highly supersaturated solutions, the a ...[more]

PMID: 32596599

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Project description:The spontaneous crystal surface reconstruction of M-plane α-Al2O3 is employed for nanopatterning and nanofabrication in various fields of research including, among others, magnetism, superconductivity, and optoelectronics. In this reconstruction process the crystalline surface transforms from a planar morphology to one with a nanoscale ripple patterning. However, the high sample temperature required to induce surface reconstruction made in situ studies of the process seem unfeasible. The kinetics of ripple pattern formation therefore remained uncertain, and thus production of templates for nanofabrication could not advance beyond a trial-and-error stage. We present an approach combining in situ real-time grazing incidence small-angle X-ray scattering experiments (GISAXS) with model-based analysis and with ex situ atomic force microscopy (AFM) to observe this morphological transition in great detail. Our approach provides time-resolved information about all relevant morphological parameters required to trace the surface topography on the nanometer scale during reconstruction, i.e., the time dependence of the pattern wavelength, the ripple length, width, and height, and thus their facet angles. It offers a comprehensive picture of this process exemplified by a M-plane α-Al2O3 surface annealed at 1325 °C for 930 min. Fitting the model parameters to the experimental GISAXS data revealed a Johnson-Mehl-Avrami-Kolmogorov type of behavior for the pattern wavelength and a predominantly linear time dependence of the other parameters. In this case the reconstruction resulted in a crystalline surface fully patterned with asymmetric ripple-shaped nanostructures of 75 nm periodicity, 15 nm in height, and 630 nm in length. By elucidating the time dependence of these morphological parameters, this study shows a powerful way to significantly advance the predictability of annealing outcome and thus to efficiently customize nanopatterned α-Al2O3 templates for improved nanofabrication routines.

Dataset Information

Real-Time Observation of CaCO₃ Mineralization in Highly Supersaturated Graphene Liquid Cells.

Publications

Real-Time Observation of CaCO<sub>3</sub> Mineralization in Highly Supersaturated Graphene Liquid Cells.

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Dataset Information

Real-Time Observation of CaCO3 Mineralization in Highly Supersaturated Graphene Liquid Cells.

Publications

Real-Time Observation of CaCO<sub>3</sub> Mineralization in Highly Supersaturated Graphene Liquid Cells.

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure

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Real-Time Observation of CaCO₃ Mineralization in Highly Supersaturated Graphene Liquid Cells.