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Pressure dependence of diffusion constant of beads. (A) Two-dimensional mean-square displacements (MSD) at 0.1 and 200 MPa (n = 100). Plots were fitted with equation, MSD(t) = 4Dx–yt, with Dx–y = 0.48 and 0.42 μm2 s−1 at 0.1 and 200 MPa, respectively. (B) Pressure dependence of diffusion constant of 1-μm bead. Plots are diffusion constants of 1-μm bead at each pressure. Solid curve represents theoretical values, as obtained from Stokes-Einstein relationship (41).
