Cold densification and sintering of nanovaterite by pressing with water

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HAUG, Matthias, Florian BOUVILLE, Cristina RUIZ AGUDO, Jonathan AVARO, Denis GEBAUER, André R. STUDART, 2020. Cold densification and sintering of nanovaterite by pressing with water. In: Journal of the European Ceramic Society. Elsevier. 40(3), pp. 893-900. ISSN 0955-2219. eISSN 1873-619X. Available under: doi: 10.1016/j.jeurceramsoc.2019.10.034

@article{Haug2020-03densi-48700, title={Cold densification and sintering of nanovaterite by pressing with water}, year={2020}, doi={10.1016/j.jeurceramsoc.2019.10.034}, number={3}, volume={40}, issn={0955-2219}, journal={Journal of the European Ceramic Society}, pages={893--900}, author={Haug, Matthias and Bouville, Florian and Ruiz Agudo, Cristina and Avaro, Jonathan and Gebauer, Denis and Studart, André R.} }

Haug, Matthias Gebauer, Denis Studart, André R. eng Gebauer, Denis Avaro, Jonathan 2020-02-18T14:27:34Z 2020-02-18T14:27:34Z Cold densification and sintering of nanovaterite by pressing with water 2020-03 Studart, André R. Ruiz Agudo, Cristina Haug, Matthias Avaro, Jonathan Bouville, Florian While dissolution-precipitation, plastic deformation and fracture have been proposed to explain the compaction of carbonates in geological formations, the role of these mechanisms on the densification process of calcium carbonate nanoparticles in synthetic systems remains poorly understood. Here, we systematically investigate the effect of pH of the aqueous phase (1 ≤ pH ≤ 7), temperature (10 ≤ T ≤ 90 °C), and pressure (10 ≤ P ≤ 800 MPa) on the cold compaction of nanovaterite powder with water to shed light on the mechanisms underlying this unique densification. Compaction experiments reveal that the applied pressure plays a major role on the densification of vaterite nanopowder with water. Our experimental data thus suggest that plastic deformation or subcritical crack growth might be important densification mechanisms for vaterite nanoparticles. These findings provide a new perspective into the cold compaction of nanopowders with water and may open promising routes for the manufacturing of CO<sub>2</sub>-based structural materials at mild processing conditions. Bouville, Florian Ruiz Agudo, Cristina

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