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Related Experiment Video

Updated: Aug 10, 2025

Synthesis of Hydrogels with Antifouling Properties As Membranes for Water Purification
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Humidity-Responsive Antimicrobial Membranes Based on Cross-Linked Copolymers Functionalized with Ionic Liquid

Denisa Druvari1, Fotini Kyriakopoulou1, Georgia C Lainioti1

  • 1Department of Chemistry, University of Patras, GR-26504 Patras, Greece.

ACS Applied Materials & Interfaces
|February 14, 2023
PubMed
Summary

New antimicrobial membranes respond to humidity, offering dual functionality for advanced applications. These self-standing films show high moisture responsiveness and inhibit bacterial growth, paving the way for smart biomedical devices.

Keywords:
antimicrobial activitycopolymers functionalized with ionic liquidshumidity-driven mobilityhumidity-responsive propertiesmonolayer membranethermal cross-linking

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Biomedical Engineering

Background:

  • Humidity-responsive materials are crucial for sensors, soft robotics, and human-machine interfaces.
  • Poly(ionic liquid)s are used in humidity sensors but their antimicrobial properties are often overlooked, especially for biomedical uses.
  • Developing materials with combined humidity response and antimicrobial activity is essential for advanced applications.

Purpose of the Study:

  • To develop dual-functional, self-standing, antimicrobial membranes with humidity-responsive properties.
  • To investigate the effect of ionic liquid functionalization on copolymer hydrophobicity, humidity response, and antimicrobial activity.
  • To create stable films and coatings through thermal cross-linking for enhanced performance.

Main Methods:

  • Synthesis of random copolymers of poly(4-vinylbenzyl N-alkyl imidazolium chloride-co-acrylic acid) with varying alkyl chain lengths.
  • Blending these copolymers with poly(cetyl trimethylammonium 4-styrene sulfonate-co-glycidyl methacrylate) for cross-linking.
  • Characterization of humidity-responsive behavior (folding/flipping motions) and antimicrobial efficacy against E. coli, P. aeruginosa, and S. aureus.

Main Results:

  • The membrane P(VBCImC12-co-AA20)/P(SSAmC16-co-GMA20) showed immediate and significant moisture response.
  • Antimicrobial activity varied with alkyl chain length and bacterial species.
  • Cross-linked membranes exhibited high efficacy against all tested microorganisms, combined with excellent humidity responsiveness.

Conclusions:

  • The developed cross-linked copolymer membranes possess dual functionality: high humidity responsiveness and broad-spectrum antimicrobial activity.
  • These membranes are suitable for applications requiring both moisture sensing and microbial inhibition, such as wearable sensors and healthcare systems.
  • The study highlights the potential of functionalized poly(ionic liquid)s in creating advanced materials for biomedical and other applications.