Concentration dependence of ω0, the characteristic exchange frequency of LysoPC between the subphase and interface for the large (squares, 150 μm radius) and small capillaries (star, 50 μm radius). Below the 0.006 mM CMC of LysoPC, ω0 is constant. Above the CMC, ω0 increases as a power law, ω0 ∝ bCβ with β = 1.1. ω0 is independent of the bubble size and only depends on LysoPC concentration.