Figure 7 contains the PSD obtained by DLS for the
pure colloidal silver dispersion and for the AgNP
released by the NRL–AgNp membranes. The released
nanoparticles have mean size similar to that of the pure
colloidal silver dispersion. Thus, the AgNPs do not
agglomerate after insertion in the NRL membranes. As
a result, the NRL can be successfully used to stabilize
and accommodate AgNP. The red shift of the plasmon
absorption band from 390 nm, in the case of pure
AgNP solution, to 405 nm, in the case of AgNP
released by the NRL seems to be a consequence of
changing the surrounding medium from water to water
plus NRL-delivered molecules, respectively, and not
due to particle agglomeration.