Fig. 4From: Sustained, Controlled and Stimuli-Responsive Drug Release Systems Based on Nanoporous Anodic Alumina with Layer-by-Layer PolyelectrolyteEnvironmental scanning electron microscope images of the top views a without polyelectrolyte coat, b with two polyelectrolyte bilayers, and c with eight polyelectrolyte bilayers. Circles about 124 and 136 are drawn in the images. The EDX measurements for cross section samples without polyelectrolyte coating (d) and with polyelectrolyte coating (e)Back to article page