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Addressing Specific (Poly)ion Effects for Layer-by-Layer Membranes.

Daniëlle Scheepers1, Anna Casimiro1, Zandrie Borneman1

  • 1Membrane Materials and Processes, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, P.O. Box 513, Eindhoven 5600 MB, The Netherlands.

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Summary

Introducing chaotropicity in layer-by-layer assembly, this study reveals how polycation chaotropicity and counterions influence nanofiltration membrane properties. Tailoring these factors optimizes membrane performance, enhancing permeability and selectivity.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Membrane Technology

Background:

  • Layer-by-layer (LbL) assembly is a key technique for nanofiltration membrane fabrication.
  • Understanding polyion interactions is crucial for optimizing LbL membrane performance.

Purpose of the Study:

  • To introduce and investigate the concept of chaotropicity in LbL assembly for nanofiltration membranes.
  • To explore the impact of polycation structure and counterions on membrane properties.
  • To synthesize and evaluate novel polycations for LbL membrane applications.

Main Methods:

  • Utilized layer-by-layer assembly with polycations: PDADMAC, PAH, and synthesized PAMA.
  • Investigated the effect of different counterions (I⁻ and Cl⁻) on PAMA.
  • Characterized membrane properties including mass adsorption, pure water permeability, molecular weight cut-off (MWCO), and salt retention.

Main Results:

  • Higher polycation chaotropicity correlated with reduced charge availability, increased mass adsorption, and higher water permeability.
  • PAMA-based membranes demonstrated tunable properties based on counterion choice, with PAMA-I showing lower size exclusion than PAMA-Cl.
  • Chaotropicity provides a framework to balance charge compensation and tune membrane performance.

Conclusions:

  • Chaotropicity is a significant factor influencing LbL membrane formation and performance.
  • The choice of polycation and counterion allows for fine-tuning of membrane properties like permeability and selectivity.
  • This research expands the understanding of polyion interactions in LbL assembly, offering new strategies for membrane design.