Séminaire LCMCP | Stephan Wolf ’Potent small molecular-weight antiscalants...’

Sorbonne Université - Campus Pierre et Marie Curie - UFR de chimie, tour 32-42, salle 101 - Sorbonne Université - Campus Pierre et Marie Curie - UFR de chimie, tour 32-42, salle 101 - Le LCMCP vous informe Stephan Wolf -  (Institute of Glass and Ceramics Friedrich-Alexander-Universität Erlangen-Nurnberg Germany) Will present a seminar entitled "Potent small molecular-weight antiscalants operate by specific - additive-cluster interactions beyond established mechanistic conception" Abstract: Transient amorphous calcium carbonate (ACC) is a crucial precursor in various mineralizing environments, and insight into its ultrastructure and formation is vital for understanding formation pathways and identifying molecular control mechanisms by additives. As of yet, small additives take an elusive role in biogenic, geologic, and industrial calcification processes as they can feature a disproportionately high impact on ACC formation. To corroborate the involvement of prenucleation clusters (PNCs). a highly debated solute species that form spontaneously in non-saturated calcium carbonate solutions we took a close look at small-molecular-weight additives that strongly differ in their impact on the formation of calcium carbonate and stabilization of ACC. We find that only those additives can effectively impede precipitation when actively triggering PNC formation. These additives fully immerse into PNCs, over-stoichiometrically enhancing calcium carbonate solubility, and co-precipitate with ACC and retarding ACC crystallization in dry and wet environments.