Fig. 2. Normalized diffusion coefficients of particles inside finite-length open channels as a function of the radius ratio λ (= a/R). Data points are from the previous works by Dettmer et al.17 (▽) and Pagliara et al.22 (△) (2a = 505 μm, L = 5 μm), and our measurements in this work (2a = 356, 505 nm, L = 5 μm) (○). The solid line is the analytical expression for a concentric sphere in an infinitely long channel obtained by Bungay and Brenner.23.
