Double charge flips of polyamide membrane by ionic liquid-decoupled bulk and interfacial diffusion for on-demand nanofiltration

Abstract Fine design of surface charge properties of polyamide membranes is crucial for selective ionic and molecular sieving. Traditional membranes face limitations due to their inherent negative charge and limited charge modification range. Herein, we report a facile ionic liquid-decoupled bulk/interfacial diffusion strategy to elaborate the double charge flips of polyamide membranes, enabling on-demand transformation from inherently negative to highly positive and near-neutral charges. The key to these flips lies in the meticulous utilization of ionic liquid that decouples intertwined bulk/interfacial diffusion, enhancing interfacial while inhibiting bulk diffusion. These charge-tunable polyamide membranes…

• NN
  National Natural Science Foundation of China

  Awards: Grant no. 22135006, 22135006
• ZU
  Zhejiang University
• FR
  Fundamental Research Funds for the Central Universities

  Award: 226-2023-00057
• NS
  Natural Science Foundation of Zhejiang Province

  Awards: Grant no. LD22E030001, LD22E030001