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. Author manuscript; available in PMC: 2012 Nov 2.
Published in final edited form as: J Am Chem Soc. 2011 Oct 7;133(43):17513–17518. doi: 10.1021/ja208456k

Figure 1.

Figure 1

Optical images of the hydrogels of 1T (pH 7.0), 2T (pH 8.5), 2C (pH 7.5), 1A (pH 5.0), 2A (pH 5.0), 1G (pH 4.0) and 2G (pH 4.0) and the solution of 1C (pH 7.0). All are at 3.0 wt%.