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Physicochemical and antibacterial properties of chitosan-polyvinylpyrrolidone films containing self-organized graphene oxide nanolayers

Mahmoudi, N ; Sharif University of Technology | 2016

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  1. Type of Document: Article
  2. DOI: 10.1002/app.43194
  3. Publisher: John Wiley and Sons Inc , 2016
  4. Abstract:
  5. Chitosan films have a great potential to be used for wound dressing and food-packaging applications if their physicochemical properties including water vapor permeability, optical transparency, and hydrophilicity are tailored to practical demands. To address these points, in this study, chitosan (CS) was combined with polyvinylpyrrolidone (PVP) and graphene oxide (GO) nanosheets (with a thickness of ∼1 nm and lateral dimensions of few micrometers). Flexible and transparent films with a high antibacterial capacity were prepared by solvent casting methods. By controlling the evaporation rate of the utilized solvent (1 vol % acidic acid in deionized water), self-organization of GO in the polymer matrix was observed. The addition of PVP to the CS/GO films significantly increased their water vapor permeability and optical transmittance. A blue shift in the optical absorption edge was also noticed. Thermal analysis coupled with Fourier transform infrared spectroscopy suggested that the superior thermal stability of the nanocomposite films was due to the formation of hydrogen bonds between the functional groups of chitosan with those of the graphene oxide. An improved bactericidal capacity of the nanocomposite films against gram-positive Staphylococcus aureus and gram-negative Escherichia coli bacteria was also observed. Highly flexible, transparent (opacity of 6.95), and antimicrobial CS/25 vol % PVP/1 wt % GO films were prepared
  6. Keywords:
  7. Graphene and fullerenes ; Bacteria ; Biomaterials ; Chitin ; Chitosan ; Deionized water ; Electromagnetic wave absorption ; Escherichia coli ; Film preparation ; Films ; Fourier transform infrared spectroscopy ; Graphene ; Hydrogen bonds ; Light absorption ; Nanocomposites ; Nanotubes ; Opacity ; Oxide films ; Polysaccharides ; Thermoanalysis ; Thermodynamic stability ; Thickness measurement ; Water vapor ; Yarn ; Antibacterial properties ; Escherichia coli bacteria ; Graphene oxide nanosheet ; Optical absorption edge ; Physicochemical property ; Poly vinyl pyrrolidone ; Solvent casting method ; Water vapor permeability ; Nanocomposite films
  8. Source: Journal of Applied Polymer Science ; Volume 133, Issue 11 , 2016 ; 00218995 (ISSN)
  9. URL: http://onlinelibrary.wiley.com/doi/10.1002/app.43194/abstract;jsessionid=CB431EA0962C87A97A8C65FA0E7D07E8.f02t03