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Ion Exchange

Ion Exchange

Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...

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Related Experiment Video

Updated: Nov 26, 2025

Three-Dimensionally Printed Microfluidic Cross-flow System for Ultrafiltration/Nanofiltration Membrane Performance Testing

Three-Dimensionally Printed Microfluidic Cross-flow System for Ultrafiltration/Nanofiltration Membrane Performance Testing

Published on: February 13, 2016

Next-Generation Ultrafiltration Membranes Enabled by Block Polymers.

Nicholas Hampu¹, Jay R Werber², Wui Yarn Chan²

¹Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, United States.

|December 14, 2020

Summary

This summary is machine-generated.

Block polymers offer a promising solution for creating uniform pore sizes in ultrafiltration (UF) membranes, improving water purification. This review analyzes methods for producing these advanced membranes to overcome current limitations in size selectivity.

Keywords:

SNIPS antifouling block polymers isoporous membranes permeability−selectivity self-assembly ultrafiltration water filtration

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Last Updated: Nov 26, 2025

Three-Dimensionally Printed Microfluidic Cross-flow System for Ultrafiltration/Nanofiltration Membrane Performance Testing

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Published on: February 13, 2016

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

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Published on: August 16, 2018

Area of Science:

Materials Science
Chemical Engineering
Environmental Science

Background:

Safe drinking water access is a global challenge, with membrane separations being a key purification strategy.
Existing ultrafiltration (UF) membranes have limited size selectivity due to broad pore size distributions.
Block polymers self-assemble into uniform domains, offering potential for precise pore size control in membranes.

Purpose of the Study:

To review and analyze methods for producing porous ultrafiltration (UF) membranes using block polymers.
To focus on the self-assembly mechanisms of block polymers and their role in pore formation.
To critically assess structure-property-performance metrics of block polymer UF membranes.

Main Methods:

Analysis of various strategies for integrating block polymers into UF membranes.
Examination of chemistries and processing techniques for block polymer membrane fabrication.
Evaluation of fundamental mechanisms of block polymer self-assembly and pore generation.

Main Results:

Block polymers enable the creation of well-defined, uniform pore sizes in UF membranes.
Different integration strategies present unique material and processing requirements for pore formation.
Block polymer UF membranes show potential for enhanced size selectivity compared to conventional membranes.

Conclusions:

Block polymer self-assembly is crucial for achieving uniform pore structures in UF membranes.
Further research into materials, processing, and structure-property relationships is needed to advance block polymer UF technology.
Optimizing block polymer UF membranes can lead to more efficient and precise water purification solutions.