Before the heat-cool cycle, the 2NapFF-TBA samples are visibly much more viscous compared to 2NapFF-Na (Figure ). Without heat-cool, Gʹ is greater than Gʺ for 2NapFF-TBA concentrations of 15 mg/mL and higher (Figure , Figure ). When 2NapFF-TBA samples are heated and cooled for 2 hours, Gʹ and Gʺ increase significantly (Gʹ is larger than Gʺ for 2NapFF-TBA concentrations of 15 mg/mL and greater), but again are not true gels with tand>0.2 for all concentrations. Example frequency data for both 2NapFF-Na and 2NapFF-TBA are shown in Figures and. The 2NapFF-TBA samples were less stable to inversion after a heat-cool cycle than the 2NapFF-Na samples (Figure and).