“…[4] Similar enthalpograms have been reported in the literature and were explained in terms of modifications of the membrane curvature as a function of temperature. [25,26] However, one cannot determine the temperature of phase transition from a gel to a fluid state as in "common" lipid mixtures, [27] but there is clearly a transition from tubes to another supramolecular assembly that was not previously observed for other counterions. [4,24] We captured cryo-TEM images after a long period of resting at room temperature ( Figure 1).…”