Chemistry

Materials science

Nanometre

Engineering

Composite material

Biochemistry

Polyamide

Nanotechnology

Polymer chemistry

Membrane

Nanopore

Nanofiltration

Monomer

Polymerization

Interfacial polymerization

Chemical engineering

Polymer

Nature Communications

Separating molecules or ions with sub-Angstrom scale precision is important but technically challenging. Achieving such a precise separation using membranes requires Angstrom scale pores with a high level of pore size uniformity. Herein, we demonstrate that precise solute-solute separation can be achieved using polyamide membranes formed via surfactant-assembly regulated interfacial polymerization (SARIP). The dynamic, self-assembled network of surfactants facilitates faster and more homogeneous diffusion of amine monomers across the water/hexane interface during interfacial polymerization, thereby forming a polyamide active layer with more uniform sub-nanometre pores compared to those formed via conventional interfacial polymerization. The polyamide membrane formed by SARIP exhibits highly size-dependent sieving of solutes, yielding a step-wise transition from low rejection to near-perfect rejection over a solute size range smaller than half Angstrom. SARIP represents an approach for the scalable fabrication of ultra-selective membranes with uniform nanopores for precise separation of ions and small solutes.

Polyamide nanofiltration membrane with highly uniform sub-nanometre pores for sub-1 Å precision separation