Nanodecoration of electrospun polymeric fibers with nanostructured silver coatings by ionized jet deposition for antibacterial tissues

Giorgia Pagnotta, Gabriela Graziani, Nicola Baldini, Alessandra Maso, Maria Letizia Focarete, Matteo Berni, Fabio Biscarini, Michele Bianchi, Chiara Gualandi

Research output: Contribution to journalArticlepeer-review

Abstract

Silver-based nanomaterials are used as antibacterial agents in a number of applications, including wound dressing, where electrospun materials can effectively promote wound healing and tissue regeneration thanks to their biomimicry, flexibility and breathability. Incorporation of such nanomaterials in electrospun nonwovens is highly challenging if aiming at maximizing stability and antibacterial efficacy and minimizing silver detachment, without neglecting process straightforwardness and scalability. In this work nanostructured silver coatings were deposited by Ionized Jet Deposition (IJD) on Polylactic acid, a medical grade polyester-urethane and Polyamide 6,6 nanofibers. The resulting materials were thoroughly characterized to gain an in-depth view of coating morphology and substrate resistance to the low-temperature deposition process used. Morphology of silver coatings with well-cohesive grains having dimensions from a few tens to a few hundreds of nanometers was analyzed by SEM, TEM and AFM. TGA, DSC, FTIR and GPC showed that the polymers well withstand the deposition process with negligible effects on their properties, the only exception being the polylactic acid that resulted more susceptible to degradation. Finally, the efficacy against S. aureus and E. coli bacterial strains was demonstrated, indicating that electrospun fibers decorated with nanostructured silver by IJD represent a breakthrough solution in the field of antibacterial devices.

Original languageEnglish
Pages (from-to)1-10
Number of pages10
JournalMaterials Science and Engineering C
Volume113
DOIs
Publication statusPublished - Aug 2020

Keywords

  • Electrospinning
  • Ionized jet deposition
  • Nanostructured coating
  • Silver coating
  • Wound dressing

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