Fig. 1: Schematic illustration of the Tröger’s Base (TB) microporous polymer membrane for ion separations. | Nature Communications

Fig. 1: Schematic illustration of the Tröger’s Base (TB) microporous polymer membrane for ion separations.

From: Microporous membrane with ionized sub-nanochannels enabling highly selective monovalent and divalent anion separation

Fig. 1

Ionized sub-nanochannels were engineered through the strategic integration of angstrom-porous quaternized TB units with ion adsorption sites. The randomly twisted V-shaped structure of TB provides regulated membrane pores with a pore window size of 5.89–6.54 Å, positioned between the anion hydration diameter and their Stokes diameter. Additionally, the incorporation of functional groups (quaternary ammonium groups) promoted channel-ion interactions and improved the monovalent ion flux.

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