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Dialysis

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Dialysis is a diffusion-based purification process that separates analyte molecules from a complex matrix. This is accomplished by allowing molecules in the solution to pass through a semipermeable membrane into a liquid on the other side. The membrane is usually made of cellulose acetate or cellulose nitrate, and the second liquid must be miscible with the solution. Ions (e.g., chloride or sodium) or organic molecules (e.g., glucose) can pass through the membrane pores, which generally have...

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Related Experiment Video

Updated: Sep 15, 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

Bijel Membranes with Tunable Porosity for pH-responsive Microfiltration.

Henrik Siegel¹, Martin F Haase¹

¹Van't Hoff Laboratory of Physical and Colloid Chemistry, Debye Institute for Nanomaterials Science, Department of Chemistry, Utrecht University, Utrecht, 3584 CH, The Netherlands.

Small (Weinheim an Der Bergstrasse, Germany)

|July 16, 2025

Summary

We developed scalable, pH-responsive microfiltration membranes using symmetric bicontinuous interfacially jammed emulsion gel (bijel) sheets. These adaptable soft bijel membranes offer tunable permeability for advanced separation applications.

Keywords:

bijels composites hydrogel nanoparticles separation membranes wetting

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Last Updated: Sep 15, 2025

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Published on: February 13, 2016

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Published on: March 13, 2016

Area of Science:

Materials Science
Chemical Engineering
Nanotechnology

Background:

Bicontinuous interfacially jammed emulsion gels (bijels) are nanoparticle-stabilized materials with promise for membrane separations.
Existing bijel membranes often use rigid scaffolds, leading to brittleness and limited adaptability.

Purpose of the Study:

To fabricate symmetric bijel sheets for scalable production of microfiltration membranes.
To engineer pH-responsive bijel membranes using stimuli-responsive polymers.
To analyze the influence of precursor properties on membrane structure and performance.

Main Methods:

Roll-to-roll solvent transfer induced phase separation (R2R-STrIPS) for bijel sheet fabrication.
Tuning pore size by adjusting surfactant concentration in the precursor solution.
Incorporation of stimuli-responsive polymers for dynamic membrane properties.

Main Results:

Demonstrated fabrication of symmetric bijel sheets with tunable pore sizes.
Developed pH-responsive bijel membranes exhibiting dynamic permeability control.
Showcased adaptability and robustness compared to traditional bijel membranes.

Conclusions:

Symmetric bijel sheets offer a scalable and robust alternative for membrane production.
pH-responsive bijel membranes provide tunable separation performance.
These adaptable membranes have potential applications in drug delivery, controlled release, and soft robotics.