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. 2017 Jun 10;3(2):23. doi: 10.3390/gels3020023

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© 2017 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 (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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(a) TEM image of HCl-C12GA hydrogel (Pt-shadowing) formed in aqueous acidic medium (HCl vapors); (b–d) SEM images of H₃PO₄-C12GA hydrogel in aqueous NaH₂PO₄ medium (lyophilized xerogel). The inset in (d) shows a representative EDX spectrum of the NaH₂PO₄-containing C12GA xerogel (average P/Na molar ratio = 1.19 ± 0.07).