In addition, the solubilization of OTPh monomers is insensitive to changes in the structure of the NaDC gel. These changes were induced with the increase of the ionic strength where the observed pyrene excimer emission is diagnostic of the changes. However, no excimer emission was observed for OTPh despite the lower emission intensities of the oligomer showing that the oligomer was present as a monomer (Figure ). Therefore, the condition for solubilization of oligomers and polymers in NaDC gels is that primary and secondary NaDC aggregates are formed, and a sufficient concentration of these aggregates is present. solubilization of the shorter P3HT polymer chains. This differential solubilization of the polymer has the drawback that not all the material was solubilized at the NaDC concentrations used.