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Updated: Apr 2, 2026

Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes

Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes

Published on: August 16, 2018

Nanoporous membranes with electrochemically switchable, chemically stabilized ionic selectivity.

Leo J Small¹, David R Wheeler, Erik D Spoerke

¹Sandia National Laboratories, PO Box 5800, MS 1411, Albuquerque, NM, USA 87185. ljsmall@sandia.gov.

|September 29, 2015

Summary

This summary is machine-generated.

Researchers developed novel electrochemically switchable chemistries for nanoporous membranes. These stable, tunable systems allow real-time control over ion transport by manipulating surface charge and pore geometry.

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Fine-tuning the Size and Minimizing the Noise of Solid-state Nanopores

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Published on: October 31, 2013

Area of Science:

Materials Science
Electrochemistry
Nanotechnology

Background:

Nanopore characteristics like size, shape, and surface charge are critical for regulating ion transport.
In situ control over these parameters is essential for developing real-time tunable ion transport systems.

Purpose of the Study:

To present a novel strategy for manipulating surface charge and controlling ionic selectivity in nanoporous membranes using electrochemically switchable chemistries.
To investigate the effects of different surface functionalizations and nanopore geometries on ion transport.

Main Methods:

Utilized diazonium-mediated surface functionalization on gold-plated nanopores in polycarbonate membranes.
Employed three distinct electrochemically switchable chemistries: nitrophenyl, quinone, and trimethyl lock.
Characterized ion transport in sodium chloride solutions, varying pore geometry (cylindrical to conical).

Main Results:

Demonstrated irreversible switching from cation to anion selectivity with nitrophenyl chemistry.
Achieved reversible switching between no selectivity and slight cation selectivity using quinone chemistry.
Showcased reversible switching of ionic selectivity by a factor of 8 with trimethyl lock chemistry.
Showed that varying pore shape imparts controllable directionality to ionic selectivity.

Conclusions:

Developed chemically stabilized, electrochemically switchable chemistries for stable and tunable ionic selectivity in nanoporous membranes.
Combined control of nanopore geometry and switchable surface chemistry enables superior, real-time control over molecular transport.
This approach facilitates the creation of advanced, tunable ion transport systems.