Lan, Z. R. Retention mechanisms of sub-pore-size molecules in semipermeable membranes. Polym. Bull. (in Chinese), 2026, 39(5), 793–798. DOI: 10.14028/j.cnki.1003-3726.2026.25.360.
Retention Mechanisms of Sub-Pore-Size Molecules in Semipermeable Membranes
This study systematically investigated the anomalous retention of small-molecule solutes during semipermeable membrane filtration. Experimental results confirm the widespread occurrence of this phenomenon
even when the hydrodynamic diameters of the solutes are smaller than the nominal membrane pore sizes. Two underlying mechanisms have been proposed and validated: (1) molecular agglomeration
via
intermolecular interactions (
e.g
.
hydrogen bonding)
which forms larger clusters that hinder permeation
and (2) dynamic pore blockage caused by the adsorption and stacking of long-chain compounds within the pores. Both mechanisms were identified as key contributors to unexpected solute retention. These findings directly link the fundamental filtration behavior to practical membrane fouling
offering important insights into the understanding and design of membrane separation processes.
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