Influence of different stress types on the mechanochemical CaCO3-synthesis

  • Mechanochemistry is considered a green alternative to conventional wet-chemistry. Several reactions have been reported to be feasible via the mechanochemical route, while detailed insight in the mechanistic background of mechanochemical reactions is still elusive. Certain is a significant role of the mechanical stress applied, but the influence of the stress type is rarely addressed. This study uses different simple setups to apply isolated impact, compressive and shear stress to the reactants of the mechanochemical CaCO3-synthesis. Measuring of the energy inputs and modelling of the stressing conditions allowed correlation of the specific energies in the setups with the chemical conversion of the inorganic model reaction. For the same specific energy, impact stressing was found to be most successful in yielding product and the stress intensity could be identified to play a crucial role. A lower stress intensity was beneficial during initiation of the reaction, whereas a progressed reaction state could take advantage of higher stressMechanochemistry is considered a green alternative to conventional wet-chemistry. Several reactions have been reported to be feasible via the mechanochemical route, while detailed insight in the mechanistic background of mechanochemical reactions is still elusive. Certain is a significant role of the mechanical stress applied, but the influence of the stress type is rarely addressed. This study uses different simple setups to apply isolated impact, compressive and shear stress to the reactants of the mechanochemical CaCO3-synthesis. Measuring of the energy inputs and modelling of the stressing conditions allowed correlation of the specific energies in the setups with the chemical conversion of the inorganic model reaction. For the same specific energy, impact stressing was found to be most successful in yielding product and the stress intensity could be identified to play a crucial role. A lower stress intensity was beneficial during initiation of the reaction, whereas a progressed reaction state could take advantage of higher stress intensities. This change is ascribed to the energy utilisation, which is limited in the beginning, but rises in an advanced reaction state due to the formation of product layers and an increased local temperature. Based on the results, a hypothesis on the influencing factors and procedure of the mechanochemical CaCO3-synthesis was formulated.show moreshow less

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Metadaten
Author:Sandra Breitung-FaesORCiD, Victor Oldhues, Desislava Dobreva, Lars Borchardt, Arno Kwade
DOI:https://doi.org/10.1016/j.powtec.2025.121449
Parent Title (English):Powder Technology
Publisher:Elsevier
Editor:Sandra Breitung-FaesORCiD
Document Type:Article
Language:English
Date of first Publication:2025/07/21
Reviewed:Begutachtet/Reviewed
Release Date:2025/09/29
Tag:Mechanical stress types; Mechanochemistry Mechanical stress types Stress intensity Reaction kinetics; Reaction kinetics; Stress intensity
Volume:466
Article Number:121449
institutes:Partikeltechnologien, Rohstoffinnovationen und Ressourceneffizienz
Research Themes:Materialien & Produktionstechnik
Licence (German):Creative Commons - CC BY - Namensnennung 4.0 International
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