Cellulose nanofibrils and silver nanowires active coatings for the development of antibacterial packaging surfaces. (15th July 2020)

• Record Type: Journal Article
• Authors: Spieser, Hugo; Denneulin, Aurore; Deganello, Davide; Gethin, David; Koppolu, Rajesh; Bras, Julien
• Is Part Of: Carbohydrate polymers. Volume 240(2020)
• Publication Date: 2020-07-15
• Subjects: cellulose nanofibrils -- silver nanowires -- transparent coatings -- antibacterial activity -- barrier properties -- up-scaling; Polysaccharides -- Periodicals; Polysaccharides -- Periodicals; Polysaccharides -- Périodiques; Electronic journals; 547.78
• DOI: 10.1016/j.carbpol.2020.116305
• Languages: English
• ISSNs: 0144-8617

Abstract

Graphical abstract: Highlights: Cellulose nanofibrils/silver nanowires ink was bar-coated on PET and PLA substrate Defect-free and transparent films with controlled thickness were produced The coatings displayed strong antibacterial activity and enhanced barrier properties Up-scaling potential was proven with roll-to-roll reverse gravure coating 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.