Role of CaCO3° Neutral Pair in Calcium Carbonate Crystallization

Role of CaCO3° Neutral Pair in Calcium Carbonate Crystallization

The molecular structure of the units that get incorporated into the nuclei of the crystalline phase and sustain their growth is a fundamental issue in the pathway from a supersaturated solution to the formation of crystals. Using a fluorescent dye we have recorded the variation of the pH value in ti...

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Veröffentlicht in:Crystal growth & design 2016-08, Vol.16 (8), p.4173-4177
Hauptverfasser: Genovese, Damiano, Montalti, Marco, Otálora, Fermín, Gómez-Morales, Jaime, Sancho-Tomás, María, Falini, Giuseppe, García-Ruiz, Juan Manuel
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container_end_page 4177
container_issue 8
container_start_page 4173
container_title Crystal growth & design
container_volume 16
creator Genovese, Damiano
Montalti, Marco
Otálora, Fermín
Gómez-Morales, Jaime
Sancho-Tomás, María
Falini, Giuseppe
García-Ruiz, Juan Manuel
description The molecular structure of the units that get incorporated into the nuclei of the crystalline phase and sustain their growth is a fundamental issue in the pathway from a supersaturated solution to the formation of crystals. Using a fluorescent dye we have recorded the variation of the pH value in time along a gel where CaCl2 and NaHCO3 counter-diffuse to crystallize CaCO3. The same pH–space–time distribution maps were also computationally obtained using a chemical speciation code (phreeqc). Using data arising from this model we investigated the space-time evolution of the activity of the single species (ions and ion pairs) involved in the crystallization process. Our combined results suggest that, whatever the pathway from solution to crystals, the neutral pair CaCO3° is a key species in the CaCO3 precipitation system.
doi_str_mv 10.1021/acs.cgd.6b00276
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title Role of CaCO3° Neutral Pair in Calcium Carbonate Crystallization
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