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Effect of metal ions with different concentrations (a) 30 mM, (b) 60 mM, and (c) 120 mM on the storage modulus of the WPI solution heated at 90 °C, pH 2 for 24 h. All the PNF/PNF-metal ion solutions were first evaluated after 24 h of incubation in order to ensure that all metal ions hydrolysis had reached equilibrium.
