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(A) Frictional losses of different fluid monolayers (G′ = 0) upon oscillatory shear flow performed at increasing frequency in the linear regime (1% strain) (□, POPC; ○, POPC + 30% cholesterol; △, E. coli lipids). (B) Lubrication flow of a composite medium made of small objects in a less mobile matrix (see main text). (C) Experimental fluidity coefficient (F = η-1 = ω/G′′) measured in a shear flow at different characteristic times (τ = 2π/ω).
