Figure 6: Electrostatic potential energy (in arbitrary units) between agar and gelatin molecules at intermolecular distance ds = 55nm. The zeta-potential plot of agar-gelatin intermolecular complexes and a titration plot is included for qualitative comparison of transition pHs. Notice that at pHC and pHφ the potential energy undergoes abrupt change. Solid lines are guide to eye. Reproduced with permission from American Chemical Society [12].