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Polymers 2019, 11, 2000 13 of 21 Polymers 2019, 11, 2000 13 of 21 Figure 5. A comparison of viable E. coli counts after 6 h of treatment in the dark at 37 ◦C on modified Figure 5. A comparison of viable E. coli counts after 6 h of treatment in the dark at 37 °C on modified composite non-woven polyviscose fabrics, both before and after laundering durability testing (i.e., composite non-woven polyviscose fabrics, both before and after laundering durability testing (i.e., post-wash (PW)). post-wash (PW)). 4. Conclusions 4. Conclusions This study reports on the use of reduced graphene oxide as a means of increasing overall loading This study reports on the use of reduced graphene oxide as a means of increasing overall loading and increasing the durability of adhesion of silver nanoparticles (AgNP) onto soft matter, non-woven and increasing the durability of adhesion of silver nanoparticles (AgNP) onto soft matter, non-woven polyviscose medical textile fabric substrates. Thus, our results show that utilisation of a simple polyviscose medical textile fabric substrates. Thus, our results show that utilisation of a simple room room temperature and ambient condition synthesis method allows highly efficient loading of rGO temperature and ambient condition synthesis method allows highly efficient loading of rGO and/or and/or AgNP into the substrates while also affording a more even and improved dispersion of AgNP AgNP into the substrates while also affording a more even and improved dispersion of AgNP throughout the surface, all without the use of any stabilising agents. The seemingly synergic effects throughout the surface, all without the use of any stabilising agents. The seemingly synergic effects and resultant properties arising from interactions of the graphene analogue and the AgNP are the and resultant properties arising from interactions of the graphene analogue and the AgNP are the focus of continued study, with future attempts looking to parse the contributions of the various focus of continued study, with future attempts looking to parse the contributions of the various physico-chemical processes at play. physico-chemical processes at play. The output material allows for multiple benefits, including enhanced antimicrobial properties The output material allows for multiple benefits, including enhanced antimicrobial properties (i.e., near-100% suppression of E. coli observed) with improved wash fastness (i.e., ~24% retention (i.e., near-100% suppression of E. coli observed) with improved wash fastness (i.e., ~24% retention after 12 wash cycles) as compared with standard NP-incorporated fabrics (i.e., <3% retention), which after 12 wash cycles) as compared with standard NP-incorporated fabrics (i.e., <3% retention), which means potential rinse-reuse capabilities, for an enhanced effect as a non-migrating antimicrobial agent. means potential rinse-reuse capabilities, for an enhanced effect as a non-migrating antimicrobial As such, the substrates hold promise for application across a wide range of biomedical applications. agent. As such, the substrates hold promise for application across a wide range of biomedical More broadly, the general wet chemical technique is flexible and can readily be extended for use in applications. More broadly, the general wet chemical technique is flexible and can readily be other nanocomposite films and coatings on various soft matter substrates by varying the reducing extended for use in other nanocomposite films and coatings on various soft matter substrates by agent concentration and/or NP-precursor. This surface treatment and modification process allows varying the reducing agent concentration and/or NP-precursor. This surface treatment and for reliably high loadings of functional materials containing functional groups that can efficiently modification process allows for reliably high loadings of functional materials containing functional bond to a substrate, to be efficiently incorporated into polymers (including metallic nanoparticles and groups that can efficiently bond to a substrate, to be efficiently incorporated into polymers (including graphene analogues for applications spanning biocidal, wettability, catalytic, and other applications). metallic nanoparticles and graphene analogues for applications spanning biocidal, wettability,PDF Image | Antimicrobial from Silver-Graphene Coated Medical Textiles
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