Original title: How a polymer filling enhances the rate and selectivity of colloid permeation across mesopores
Mikhail Y. Laktionov, Frans A. M. Leermakers, Ralf P. Richter, Leonid I. Klushin +1 · August 2026
Tiny channels called mesopores can sort and deliver small particles known as colloids. You might expect filling a pore with tangled chain-like molecules, called polymers, would clog the opening and slow transport down. Living cells prove otherwise. Their nuclear pores use polymer fillings to stop small particles while quickly letting certain larger ones through. Researchers wanted to explain this puzzling transport. They showed that polymers can actually speed up permeation compared to an empty pore. The polymer filling must attract the colloids and reach outside the opening to catch as many particles as possible. By tuning this setup, filled mesopores can selectively gate colloids using their size and surface features. This insight helps explain cell biology and guides better molecular filters.
You stand at a window trying to catch moths with a jar. If you cover the jar's mouth with a sticky cobweb that also hangs outside the rim, you'd guess it would block moths. But moths that are attracted to the web get snagged from farther away, and then slide through the jar opening faster than if the jar had no web. In this paper, the polymer coating is that sticky web, the pore is the jar mouth, and the moths are the tiny particles being sorted.
This explains how living cells, like those in your body, use polymer-filled pores to precisely control which molecules enter the nucleus. It also provides a blueprint for designing smart membranes that can filter particles by size and surface chemistry—useful for drug delivery, water purification, and chemical sensing.
The abstract does not specify whether the findings come from experiment or modeling, so the practical feasibility for real-world applications is not established. It does not address how different polymer types or pore geometries affect performance, nor does it discuss long-term stability, fouling, or manufacturing of such coatings.
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How a polymer filling enhances the rate and selectivity of colloid permeation across mesopores — Mikhail Y. Laktionov, Frans A. M. Leermakers, Ralf P. Richter et al.
Abstract licence: CC0
Explanation generated by Synthesis from the abstract — it is not the original paper. This is a preprint, so it hasn't necessarily been peer reviewed.