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. Author manuscript; available in PMC: 2013 Sep 18.
Published in final edited form as: Langmuir. 2012 Sep 4;28(37):13512–13517. doi: 10.1021/la302583a

Figure 1.

Figure 1

Optical images of the hydrogels of (A) 2 (1.0 wt%, pH 7.0); (B) 3 (1.5 wt%, pH 7.0); (C) 4 (1.5 wt%, pH 7.0); (D) 5 (3.0 wt%, pH 4.0); (E) 6 (3.0 wt%, pH 4.0); and (F) 7 (3.0 wt%, pH 4.0).