Self-transformation of solid CaCO3 microspheres into core-shell and hollow hierarchical structures revealed by coherent X-ray diffraction imaging - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue International Union of Crystallography journal Année : 2022

Self-transformation of solid CaCO3 microspheres into core-shell and hollow hierarchical structures revealed by coherent X-ray diffraction imaging

Résumé

The self-transformation of solid microspheres into complex core-shell and hollow architectures cannot be explained by classical Ostwald ripening alone. Here, coherent X-ray diffraction imaging and 3D X-ray fluorescence were used to visualize in 3D the formation of hollow microparticles of calcium carbonate in the presence of polystyrene sulfonate (PSS). During the dissolution of the core made from 10-25 nm crystals, the shell developed a global spheroidal shape composed of an innermost layer of 30 nm particles containing high PSS content on which oriented vaterite crystals grew with their c axis mainly oriented along the meridians. The stabilizing role of PSS and the minimization of the intercrystal dipolar energy can explain in combination with Ostwald ripening the formation of these sophisticated structures as encountered in many systems such as
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hal-03751616 , version 1 (15-08-2022)

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Thomas Beuvier, Yuriy Chushkin, Federico Zontone, Alain Gibaud, Oxana Cherkas, et al.. Self-transformation of solid CaCO3 microspheres into core-shell and hollow hierarchical structures revealed by coherent X-ray diffraction imaging. International Union of Crystallography journal, 2022, 9 (5), pp.580-593. ⟨10.1107/s2052252522006108⟩. ⟨hal-03751616⟩
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