Samples Mean size Zeta potential stock solution 19.2 ± 0.3 nm -58.02 ± 4.21 mV tap 90 ± 3.8 nm 0.00 ± 0.00 mV green 40.1 ± 1.2 nm -4.62 ± 2.58 mV brown 34.6 ± 2.1 nm -0.09 ± 0.01 mV

Table 2 : Mean size and Zeta potential of AgNPs in the three types of water. Theseresults were observed with a DLS after a filtration throughout a membrane of 0.45um in order to eliminate large aggregates in the solution and measure the meansize of the particle.