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. 2016 Aug 23;11:372. doi: 10.1186/s11671-016-1585-4

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© The Author(s). 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 2 — Schematic representation of the polyelectrolyte layer-by-layer deposition procedure. a NAA pores with positively charged walls after APTES treatment. b PSS deposition by immersing the APTES treated surface. c PAH deposition by immersing the PSS covered substrate. d DOX loading in the swollen PEM film at pH 2.0. e DOX confinement due to the PEM layer contraction at pH 8.0. f DOX releases at different pH media