Cellulose nanofibrils and silver nanowires active coatings for the development of antibacterial packaging surfaces

Hugo Spieser, Aurore Denneulin, Davide Deganello, David Gethin, Rajesh Koppolu, Julien Bras

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)

Abstract

An active ink composed of cellulose nanofibrils and silver nanowires was deposited on flexible and transparent polymer films using the bar coating process, achieving controlled thicknesses ranging from 200 nm up to 2 μm. For 350 nm thick coating on polyethylene terephthalate films, high transparency (75.6% transmittance) and strong reduction of bacterial growth equal to 89.3% and 100% was noted respectively against Gram-negative Escherichia Coli and Gram-positive Staphylococcus Aureus bacteria using AATCC contact active standard test. Retained antibacterial activity was found with films produced by reverse gravure roll-to-roll process, showing the promising capability of this antibacterial solution to be deployed industrially. Finally, the same ink was also deposited on polylactic acid substrate to investigate barrier properties: for 350 nm thick coating, a reduction of 49% of oxygen transmission rate (dry conditions) and 47% reduction of water vapor transmission rate was noted, proving the enhanced barrier properties of the coatings.

Original languageEnglish
Article number116305
Pages (from-to)
JournalCarbohydrate Polymers
Volume240
DOIs
Publication statusPublished - 15 Jul 2020
MoE publication typeA1 Journal article-refereed

Keywords

  • Cellulose nanofibrils
  • Silver nanowires
  • Barrier properties
  • Antibacterial activity
  • up-scaling
  • Transparent coatings

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