In situ probing calcium carbonate formation by combining fast controlled precipitation method and small-angle X-ray scattering.

Yanjia Chao (1) , Olivier Horner (2) , Philippe Vallée (3) , Florian Meneau (4) , Olga Alos-Ramos (1) , Franck Hui (5) , Mireille Turmine (5) , Hubert Perrot (5) , Jean Lédion (6)

1 EDF R&D LNHE - Laboratoire National d’Hydraulique et Environnement
2 (EPF) - Ecole Polytechnique Féminine
3 Biophysics-Solutions
4 SSOLEIL - Synchrotron SOLEIL
5 LISE - Laboratoire Interfaces et Systèmes Electrochimiques
6 ARTS

The initial stage of calcium carbonate nucleation and growth, found usually in "natural" precipitation conditions, is still not well understood. The calcium carbonate formation for moderate supersaturation level could be achieved by an original method called the fast controlled precipitation (FCP) method. FCP was coupled with SAXS (small-angle X-ray scattering) measurements to get insight into the nucleation and growth mechanisms of calcium carbonate particles in Ca(HCO3)2 aqueous solutions. Two size distributions of particles were observed. The particle size evolutions of these two distributions were obtained by analyzing the SAXS data. A nice agreement was obtained between the total volume fractions of CaCO3 obtained by SAXS analysis and by pH-resistivity curve modeling (from FCP tests).

Domaines: Autre

Yanjia Chao, Olivier Horner, Philippe Vallée, Florian Meneau, Olga Alos-Ramos, et al.. In situ probing calcium carbonate formation by combining fast controlled precipitation method and small-angle X-ray scattering.. Langmuir, 2014, 30 (12), pp.3303-3309. ⟨10.1021/la500202g⟩. ⟨hal-01024660⟩