FIGURE 6.

Intensity of the diffracted grazing x-rays, I/I₀, as a function of the in-plane vector, q_xy. For GIXD experiments, the DPPC monolayer was compressed under a helium atmosphere to reduce x-ray scattering. When compressed at 20 mN m⁻¹, the DPPC monolayer shows the two Bragg peaks characteristic of the tilted LC phase of DPPC at 1.42 and 1.51 Å⁻¹ (curve a). When the He atmosphere is saturated with gPFOB (curve b), the peaks disappear rapidly, establishing the dissolution of the crystalline LC domains and the rapid uniform respreading of the DPPC molecules.