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Article Dans Une Revue Journal of Materials Chemistry Année : 2011

Synthesis of hollow vaterite CaCO3 microspheres in supercritical carbon dioxide medium

Résumé

We here describe a rapid method for synthesizing hollow core, porous crystalline calcium carbonate microspheres composed of vaterite using supercritical carbon dioxide in aqueous media, without surfactants. We show that the reaction in alkaline media rapidly conducts to the formation of microspheres with an average diameter of 5 µm. SEM, TEM and AFM observations reveal that the microspheres have a hollow core of around 0.7 µm width and are composed of nanograins with an average diameter of 40 nm. These nanograins are responsible for the high specific surface area of 16 m2 g−1 deduced from nitrogen absorption/desorption isotherms, which moreover confers an important porosity to the microspheres. We believe this work may pave the way for the elaboration of a biomaterial with a large potential for therapeutic as well as diagnostic applications.

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Chimie
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Dates et versions

hal-02004535 , version 1 (01-02-2019)

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Thomas Beuvier, Brice Calvignac, Gaëtan Jean-Robert Delcroix, My Kien Tran, Stéphanie Kodjikian, et al.. Synthesis of hollow vaterite CaCO3 microspheres in supercritical carbon dioxide medium. Journal of Materials Chemistry, 2011, 21 (26), pp.9757-9761. ⟨10.1039/C1JM10770D⟩. ⟨hal-02004535⟩
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