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Functionalizing a Polyelectrolyte Complex with Chitosan Derivatives to Tailor Membrane Surface Properties.

Yechan Won¹, Kazi Sadman², Gabrielle Stein³

¹Department of Civil and Environmental Engineering, Northwestern University, Evanston, Illinois 60208, United States.

Langmuir : the ACS Journal of Surfaces and Colloids

|October 23, 2020

Summary

This summary is machine-generated.

Polyelectrolyte complex (PEC) membranes functionalized with chitosan derivatives show tunable properties for separations and fouling control. These modified PEC materials offer enhanced stability, selective repulsion, and antibacterial action, improving membrane performance.

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Area of Science:

Materials Science
Membrane Technology
Biomaterials

Background:

Polyelectrolyte complexes (PECs) are promising for tunable membranes in separations and fouling control.
Chitosan derivatives offer functionalization potential for tailoring surface properties and efficacy.

Purpose of the Study:

To develop and characterize carboxymethyl chitosan (CMC-) and quaternized chitosan (QC+) functionalized PECs.
To evaluate the stability, adsorption resistance, and antibacterial efficacy of these functionalized PECs.
To assess their performance in filtration experiments for fouling control.

Main Methods:

Preparation and characterization of CMC- and QC+ using FT-IR and 1H NMR.
Evaluation of PEC stability, adsorption, and antibacterial activity against Pseudomonas putida.
Filtration experiments to assess organic fouling and flux recovery.

Main Results:

Functionalized PECs showed no chitosan derivative release and selective repulsion of substances.
PEC surfaces exhibited lower bacterial attachment and significant antimicrobial properties.
CMC-/PEC and unmodified PEC demonstrated reduced organic fouling and higher flux recovery.

Conclusions:

Functionalized PECs offer tunable surface properties for enhanced membrane performance.
These materials show potential as fouling-resistant layers or sacrificial protective coatings.
The surface modification strategy effectively improves separation and fouling control capabilities.