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Enhancing Polydimethylsiloxane with Silver Nanoparticles for Biomedical Coatings.

Axel Bachoux1, Cédric Desroches1, Laurence Bois1

  • 1LMI UMR 5615, CNRS, Universite Claude Bernard Lyon 1, 69100 Villeurbanne, France.

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|December 24, 2025
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Summary

This study presents a novel method for creating biocompatible silver nanoparticle (AgNP) coatings using polydimethylsiloxane (PDMS). The resulting nanocomposites show antibacterial potential without harming human cells, balancing efficacy and safety.

Keywords:
PDMSantibacterial activitybiomedical applicationscoatingcytocompatibilitysilver nanoparticles

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Area of Science:

  • Materials Science
  • Biomedical Engineering
  • Nanotechnology

Background:

  • Silver nanoparticles (AgNPs) are effective antibacterial agents but can be cytotoxic at high concentrations.
  • Balancing AgNP antibacterial efficacy with cytocompatibility is essential for biomedical uses.
  • Polydimethylsiloxane (PDMS) is a widely used biomedical polymer known for its user-friendliness.

Purpose of the Study:

  • To develop a cost-effective method for creating AgNP-functionalized PDMS coatings.
  • To assess the cytocompatibility and antibacterial anti-adhesive properties of the novel nanocomposites.
  • To explore the potential of these metal-polymer nanocomposites (MPNs) for biomedical applications.

Main Methods:

  • In situ reduction of silver ions using the Si-H silane functions of PDMS in tetrahydrofuran (THF).
  • Swelling of PDMS with THF to facilitate silver ion diffusion and subsequent reduction.
  • Characterization of resulting 10 nm AgNPs within the PDMS matrix using SEM and qualitative Live/Dead staining.

Main Results:

  • Successfully synthesized PDMS functionalized with well-distributed 10 nm AgNPs.
  • Metal-polymer nanocomposites (MPNs) showed no apparent cytotoxicity on human gingival fibroblasts.
  • SEM analysis indicated a qualitative reduction in *E. coli* adhesion, suggesting antibacterial anti-adhesive properties.

Conclusions:

  • A user-friendly, cost-effective method for creating cytocompatible AgNP-PDMS nanocomposites was established.
  • The developed MPNs exhibit promising antibacterial anti-adhesive potential against *E. coli*.
  • Further research on AgNP release profiles is needed to optimize these coatings for phototherapy devices and clinical use.