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. 2014 Jul 30;4(3):583–598. doi: 10.3390/nano4030583

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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/).

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N₂ physisorption isotherms of samples 5–8.