FIGURE 6.

Collapse of films after rapid compression below π_e. POPC monolayers were compressed at 54 ± 6 min⁻¹ from 5.2 ± 0.1 mN/m to 42.5 ± 3.1 mN/m. The films were then held at constant surface pressure for roughly 6 min, comparable to the standard manipulation of films compressed to high surface pressures (Fig. 1), before undergoing further compression at 0.024 ± 0.002 min⁻¹. Area is expressed relative to the initial area of the spread film before compression. Curves are representative of four experiments. Symbols indicate mean ± SD at selected points, with error bars less than the size of the symbols in some instances. (A) Variation of surface pressure and surface area with time. (B) The same data expressed as surface pressure versus surface area.