In a proof-of-concept study, silicon wafers were LbL-coated with synthetic polyelectrolytes in bilayers. Antibacterial effects were apparent and also antiviral activity against the H1N1 influenza virus. Although the coated material proved to be 100% bactericidal against waterborne bacteria, it demonstrated 60% virucidal activity against an H1N1 droplet after coating three layers of the polyelectrolyte. However, as the coating was increased to 7.5 bilayers, 100% virucidal activity was observed [126].