Their size ranges from 10 to 50 nm, increasing with higher Mg 2+ concentration and the acidity of the precipitation solution. The final time point, where the synthesis was complete, was fitted using a Monte Carlo simulation-based approach using a polydisperse sphere model, which was post-modeling fitted with a Gaussian size distribution, as shown in Figure . We obtain the mean particle size and relative size distribution (RSD), from the full width at half maximum (FWHM) of the Gaussian distribution