The Ca(OH) 2 nucleation experiments yield turbid suspensions of precipitated Ca(OH) 2 . The solid calcium hydroxide was isolated at the end of each experiment, i.e., immediately after the titration experiments were stopped (last point of each curve in figure ) from the suspension by vacuum filtration over a 0.22 µm polystyrene filter disc. The solid was washed two times using small amounts of isopropanol, dried under a constant flow of nitrogen overnight, and stored under a nitrogen atmosphere until further analysis. A small sample amount was mounted on a specimen holder for SEM analysis.