Synthesis of aragonite CaCO3 nanocrystals by reactive crystallization in a high shear mixer. Issue 5 (21st April 2017)

• Record Type: Journal Article
• Authors: Yang, Chao; Zhang, Jinli; Li, Wei; Shang, Shanshan; Guo, Cuili
• Is Part Of: Crystal research and technology. Volume 52:Issue 5(2017)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2017-04-21
• Subjects: Calcium carbonate -- high shear mixer -- aragonite -- reactive crystallization; Crystallography -- Periodicals; 548
• DOI: 10.1002/crat.201700002
• Languages: English
• ISSNs: 0232-1300

Abstract

Abstract : Aragonite CaCO3 nanoparticles were prepared in an in‐line high shear mixer (HSM)‐aided crystallizer, involving the gas‐liquid‐solid multiphase reactive crystallization between the CO2 gas and the aqueous slurry of Ca(OH)2 . High crystalline purity aragonite CaCO3 with the average width of 50 nm was prepared. Such an HSM‐aided crystallizer is superior in adjusting the micro‐mixing environment in the multiphase reactive crystallization, which is beneficial to the formation of the metastable CaCO3 crystal. Abstract : Aragonite CaCO3 nanoparticles were prepared in an in‐line high shear mixer (HSM)‐aided crystallizer involving the gas‐liquid‐solid (G‐L‐S) multiphase reactive crystallization between CO2 gas and the aqueous slurry of Ca(OH)2 . High crystalline purity aragonite CaCO3 with the average width of 50 nm and the length/width ratio of 10 were prepared in the HSM‐aided crystallizer. Major factors including temperature, CO2 flow rate and high shear rates had been studied to adjust the polymorph and the morphology of CaCO3 nanoparticles. The results indicate that the high rotor rates of HSM generate sufficient micro‐mixing level in the reactive crystallization, beneficial to the formation of metastable crystal CaCO3 . Such HSM‐aided crystallizer is superior to adjust the micro‐mixing environment in the multiphase reactive crystallization, providing a facile pathway to modulate the morphology and crystal growth of metastable crystals.