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. 2009 Jun 3;96(11):4598–4609. doi: 10.1016/j.bpj.2009.01.063

Figure 4.

Figure 4

(Left) Pressure-area isotherms of DMPC at 20°C and 22°C, and of DPPC at 20°C (all recorded until monolayer collapse). (Right) Compressibility κT versus surface pressure Π. The DMPC compressibility curve at 22°C is incomplete due to monolayer instabilities/collapse observed at temperatures close to the critical temperature Tc (cf. left panel). The profile for compressibility of DPPC shows a narrow peak centered at Π = 8 mN/m, which is more than 10 times higher in magnitude than for DMPC.