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. 2014 Jul 18;7(7):5225–5253. doi: 10.3390/ma7075225

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© 2014 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).

PMC Copyright notice

NAA with different pore radii obtained by different pore widening times. Adapted with permission from [50]. Copyright 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.