Network‐Nanostructured ZIF‐8 to Enable Percolation for Enhanced Gas Transport

Abstract Membrane‐based separations offer energy‐efficient solutions for various applications, but commercial polymer membranes show limited performance and stability. Mixed‐matrix (MMMs), incorporating nanoporous inorganic materials in matrices, have been of great interest to circumvent these polymer‐specific issues. However, reaching the percolation threshold is crucial leverage high‐performing phases fully, yet traditional sphere‐like nanofillers require high loadings that easily result agglomerations non‐selective defects. Here, a branch‐shaped zeolitic imidazole framework‐8 (ZIF‐8) nanoparticle synthesized where its unique morphology automatically interconnects, readily forming percolated networks within matrix at as low 20 wt.%. Because surface‐area‐to‐volume ratios branched ZIF‐8 (BZ), strong polymer–particle interactions suppress chain dynamics rotation ligand. This interphase confinement results enhanced membrane stability smaller diffusion cut‐off than ZIF‐8. With pre‐connected pathways confined ZIF pores, BZ MMMs significantly outperformed with H 2 ‐based separations. Overall, findings provide novel approach enhance filler effects even without any alignment, which can enable development advanced fields desired, including separations, sensors, conductors, batteries.