Figure 3. shows the process of apply external dc electric field to the gold nanoparticles colloidal

From

Effect of the Electric Field on the Antibacterial Activity of Au Nanoparticles on Some Gram-positive and Gram-negative Bacteria

Thamir Jumaa, Maysaa Chasib, Mazin K. Hamid, Raad Al-Haddad

Nanoscience and Nanotechnology Research. 2014, 2(1), 1-7 doi:10.12691/nnr-2-1-1