Extended Data Fig. 5: Water self-diffusion.
From: Selective ion transport through hydrated micropores in polymer membranes
a, Localized (Dloc) and long-range (Dlr) water self-diffusion. b, The ratio of Dloc/Dlr as an indication of the degree of water cluster percolation. QENS data were acquired at 298 K on a picosecond timescale, and PFG-NMR data were obtained at 302.5 K with an observation time of 30 ms. c, Number of isolated water clusters in simulated boxes, derived from Extended Data Fig. 4. Pore size, however, may also influence the Dloc/Dlr ratio. To elucidate this factor, we compared Dloc among cPIMs, as it directly reflects the degree of pore confinement. The variation in Dloc among the membranes is relatively small compared to the differences in the Dloc/Dlr. For instance, Dloc in cPIM-BP is only 39% lower than in cPIM-Et, yet the Dloc/Dlr in cPIM-BP is nearly 10 times greater than that of cPIM-Et. This comparison confirms the direct correlation between Dloc/Dlr ratio and water cluster interconnectivity.
