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Membrane Transport Processes Analyzed by a Highly Parallel Nanopore Chip System at Single Protein Resolution

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Intercrystalline Channels at Subnanometer Scale for Precise Molecular Nanofiltration.

Dongchen Shi¹, He Li¹, Xin Yu¹

¹Department of Chemical and Biomolecular Engineering, National University of Singapore, Singapore 117585, Singapore.

Journal of the American Chemical Society

|July 12, 2023

Summary

Researchers developed sub-1 nm channels in aluminum formate membranes by controlling crystal formation. These tunable, scalable membranes offer precise separation for various nanoscale mass transport applications.

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Area of Science:

Materials Science
Nanotechnology
Chemical Engineering

Background:

Membrane technology offers cost-effective and energy-efficient separations.
Developing materials with uniform, tunable subnanometer channels is crucial for advanced separations.
Existing membranes often lack the required uniformity, tunability, or scalability.

Purpose of the Study:

To construct sub-1 nm intercrystalline channels with tunable size and high performance.
To elucidate the transport properties of these novel nanoscale channels.
To provide a scalable platform for nanoscale mass transport applications.

Main Methods:

Utilizing the amorphous-to-crystalline transformation of 3D aluminum formate.
Controlling transformation time to tune channel size from macroscopic to nanometer scales.
Characterizing membrane selectivity, permeance, and transport behavior.

Main Results:

Successfully constructed sub-1 nm intercrystalline channels in aluminum formate membranes.
Achieved tunable molecular weight cutoffs (300-650 Da) and high ethanol permeance (0.8-22.0 L m⁻² h⁻¹ bar⁻¹).
Observed a transition from continuum to subcontinuum flow, described by a modified Hagen-Poiseuille model.

Conclusions:

A scalable method for creating tunable sub-1 nm channels using aluminum formate crystals was developed.
The resulting membranes demonstrate tailored selectivity and permeance for precise molecular separations.
This approach offers a new platform for diverse applications relying on nanoscale mass transport.