Darkins, Robert;
Kim, Yi-Yeoun;
Green, David C;
Broad, Alexander;
Duffy, Dorothy M;
Meldrum, Fiona C;
Ford, Ian J;
(2022)
Calcite Kinetics for Spiral Growth and Two-Dimensional Nucleation.
Crystal Growth & Design
10.1021/acs.cgd.2c00378.
(In press).
Preview |
Text
acs.cgd.2c00378.pdf - Published Version Download (2MB) | Preview |
Abstract
Calcite crystals grow by means of molecular steps that develop on {10.4} faces. These steps can arise stochastically via two-dimensional (2D) nucleation or emerge steadily from dislocations to form spiral hillocks. Here, we determine the kinetics of these two growth mechanisms as a function of supersaturation. We show that calcite crystals larger than ∼1 μm favor spiral growth over 2D nucleation, irrespective of the supersaturation. Spirals prevail beyond this length scale because slow boundary layer diffusion creates a low surface supersaturation that favors the spiral mechanism. Sub-micron crystals favor 2D nucleation at high supersaturations, although diffusion can still limit the growth of nanoscopic crystals. Additives can change the dominant mechanism by impeding spiral growth or by directly promoting 2D nucleation.
| Type: | Article |
|---|---|
| Title: | Calcite Kinetics for Spiral Growth and Two-Dimensional Nucleation |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1021/acs.cgd.2c00378 |
| Publisher version: | https://doi.org/10.1021/acs.cgd.2c00378 |
| Language: | English |
| Additional information: | Copyright © 2022 The Authors. Published by American Chemical Society. This is an Open Access article published under a Creative Commons Attribution 4.0 International (CC BY 4.0) Licence (https://creativecommons.org/licenses/by/4.0/). |
| Keywords: | Calcite, Crystallization, Crystals, Nucleation, Supersaturation |
| UCL classification: | UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology UCL > Provost and Vice Provost Offices > UCL BEAMS UCL UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10149934 |
Archive Staff Only
 |
View Item |
