fig3

From: 2D organic framework membranes: extending functions in natural ion channels to scalable nanofluidic applications

Figure 3. Ion transport mechanism in bionic nanofluidic channel. (A) Potential of mean force (PMF) and hydration number (N_c) for Na⁺ entering/exiting a nanochannel. (A) Ref.^[67] Copyright © 2020 American Chemical Society; (B) Structures of UiO-66-(OH)₂ and UiO-66-(OCH₃)₂; (C) Ionic conductance of UiO-66-(OH)₂ and UiO-66-(OCH₃)₂membranes in 100 mM electrolyte solutions; (D) Activation energies governing K⁺/Mg²⁺ transport across UiO-66-(OH)₂ and UiO-66-(OMe)₂ frameworks. (B-D) Ref.^[81] Copyright © 2024, The Author(s); Schematic Li⁺ migration along (E) parallel and vertical pathways with (F) corresponding energy barriers. (E and F) Ref.^[85] Copyright © 2025 Wiley-VCH GmbH; (G) Simulation of hydrated ions in 2D nanofluidic channels; (H) The simulation of D_channel/D_bulk with d_ion-wall for various ions and force fields. (G and H) Ref.^[93] Copyright © 2025, The Author(s). FF: Force fields; OPLS: optimized potentials for liquid simulations; AA: all-atom BN:boron nitride; D_channel/D_bulk: the ion self-diffusivity ratio of 2D nanochannels to bulk water; d_ion-wall: the distance of ion-wall.