Figure 4From: pH-responsive drug delivery system based on hollow silicon dioxide micropillars coated with polyelectrolyte multilayersFluorescence confocal images of PEM-coated and DOX-loaded micropillars. Fluorescence confocal micrograph of the micropillar arrays in top view after PEM coating (eight bilayers) and DOX loading (A); detached hollow micropillars with uniform size distribution (B); and single detached micropillar with PEM and DOX all along the walls (C).Back to article page