As mentioned earlier, the bactericidal efficacy of silver nanoparticles
over a range of 5–100 nm is significantly enhanced as
the size of nanoparticles is reduced below 10 nm. Therefore, a
size-dependent antibacterial efficacy was tested against three
bacterial strains where the nanoparticles taken were of size 5, 7
and 10 nm, designated as Ag(5), Ag(7), and Ag(10), respectively