title: Viscoelastic properties and antimicrobial activity of cellulose fiber sheets impregnated with Ag nanoparticles.
abstract: A silver nanoparticle colloid was prepared by a modified Tollens method using d-glucose as the reduction agent. The obtained nanoparticles were used for the modification of pine, linter and recycled cellulose fibers. Although the silver contents were relatively low (0.05-0.13 wt.%), the cellulose-sheets prepared from the modified fibers show improved mechanical and viscoelastic properties. The tensile index (strength) increased with up to 30% in comparison to the index of the sheets obtained from the untreated fibers. The influence of the nanoparticles on the viscoelastic properties of the cellulose sheets was investigated by dynamic mechanical analysis (DMA) in the temperature range from -120 to 20 °C and with a force frequency of 100 Hz. A broad relaxation transition positioned at -80 °C was observed in the loss modulus spectrum of all the cellulose sheets, while the Ag-modified sheets exhibited higher storage moduli values in the whole temperature range. The antimicrobial activity tests show that the pine, silver and recycled cellulose fiber sheets with silver nanoparticles can be successfully employed to prevent the viability and growth of the common pathogens Staphylococcus aureus, Escherichia coli and Candida albicans.
authors: University of West Hungary, Institute of Wood and Paper Technology, Bajcsy Zs. E. u. 4, 9400 Sopron, Hungary.
authors: Levente
authors: L
authors: Csóka
authors: Dušan K
authors: DK
authors: Božanić
authors: Veronika
authors: V
authors: Nagy
authors: Suzana
authors: S
authors: Dimitrijević-Branković
authors: Adriaan S
authors: AS
authors: Luyt
authors: George
authors: G
authors: Grozdits
authors: Vladimir
authors: V
authors: Djoković
mesh_terms: D000890:Anti-Infective Agents / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D002176:Candida albicans / Q000187:drug effects / Q000254:growth & development; D002482:Cellulose / Q000737:chemistry*; D003102:Colloids; D004926:Escherichia coli / Q000187:drug effects / Q000254:growth & development; D053768:Metal Nanoparticles / Q000737:chemistry*; D008826:Microbial Sensitivity Tests; D057139:Nanofibers / Q000737:chemistry; D012834:Silver / Q000737:chemistry* / Q000494:pharmacology; D013211:Staphylococcus aureus / Q000187:drug effects / Q000254:growth & development; D013499:Surface Properties; D013696:Temperature; D055682:Viscoelastic Substances / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology
chemical_list: D000890:Anti-Infective Agents; D003102:Colloids; D055682:Viscoelastic Substances; D012834:Silver; D002482:Cellulose