Investigation of the Degree of Functionalization and Colloidal Stability of Shell-by-Shell Functionalized TiO<sub>2</sub> Nanoparticles as a Function of Different Phosphonic Acid Chain Lengths.

[ 29 ] By calculating the grafting densities from the average weight losses of both measurements, which were performed for reproducibility reasons for all six systems functionalized with the same PA concentration of 6.25 mM (see Figure 1a ), an interesting trend was observed, as presented in Figure 1b .

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