Designing membranes with specific binding sites for selective ion separations Violet, Camille; Ball, Akash; Heiranian, Mohammad; Villalobos, Luis Francisco; Zhang, Junwei; Uralcan, Betul; Kulik, Heather; Haji-Akbari, Amir; Elimelech, Menachem A new class of membranes that can separate ions of similar size and charge is highly desired for resource recovery, water reuse and energy storage technologies. These separations require membrane nanochannels with simultaneous ångström-scale confinement and