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. Author manuscript; available in PMC: 2009 Mar 26.
Published in final edited form as: J Am Chem Soc. 2008 Mar 4;130(12):3892–3899. doi: 10.1021/ja076553s

Figure 1.

Figure 1

Linear PA samples from left to right: (1) PA solution without irradiation, (2) gelled PA without irradiation, (3) PA solution with irradiation, and (4) gelled PA with irradiation. Samples were irradiated for 2 min in this image. Nonirradiated samples occasionally appeared tinted blue due to polymerization either from stray UV light exposure or thermal excitation.