After silver (Ag) has been Nano-sized, it becomes positively charged Nano-particles (Ag+). When it comes into contact with negatively charged cells of the micro organisms, they attract each other. The Ag+ penetrates through the cell surface and changes the inner composition, thus lowering generation capacity. This prevents the cells from metabolizing and reproducing, thus leading to eventual death of the germs.
Ag+ also strongly attracts the -SH.-NH2.-COOH and other groups of the enzyme protein and reacts with them. This prevents the formation of protein (which is the source of energy), destroys the cell membrane of the germs and results in their eventual death.
Final line of defense against germs.