Figure 6From: pH-responsive drug delivery system based on hollow silicon dioxide micropillars coated with polyelectrolyte multilayersEffect of the bilayer number in the DOX release. (A) Release profiles of DOX from PEM coated with different layer numbers (pH 7.4); (B) DOX released after 24 h and (C) time to reach the 80% of the total release as a function of the number of layers.Back to article page