Calcium-silicate-hydrates are known to form nanometer-large platelets if they are precipitated from a homogeneous solution . Therefore, SEM imaging is unsuitable for characterizing the C-S-H precipitates' morphology. Hence, 5 µL samples were removed from the titration experiment at the local maximum of the measured calcium concentration using a piston pipette, directly deposited on a TEM grid (carbon-coated copper), blotted using a filter paper, and subjected to TEM analysis.