Extended Data Fig. 6: Schematic of the multiscale model used to calculate the effective diffusion coefficient.
From: Breakdown of the Nernst–Einstein relation in carbon nanotube porins
As discussed in the Methods section, the system is divided into 3 parts: (i) the bulk solution (highlighted in grey), (ii) the CNT entrance region (highlighted in purple), and (iii) the CNT interior (highlighted in yellow). The K+ ion diffusion in the CNT entrance and interior regions corresponds to anomalous subdiffusion, which is described using the generalized time-fractional diffusion equation with fractional diffusion coefficients and exponents.
