One-pot synthesis of cellulose / silver nanoparticle fibers and their antibacterial application

Abstract

A simple, novel method was developed for synthesizing cellulose (CE) fibers doped with silver nanoparticles (Ag NPs) in the green solvent tetrabutylammonium hydroxide / dimethyl sulfoxide / H2O at room temperature. Tetrabutylammonium hydroxide accelerated the reduction of Ag+ to Ag by the cellulose chains, yielding Ag NPs in cellulose solution stabilized using polyethyleneimine (PEI). After 24 h, almost all the Ag+ was reduced to Ag NPs. The influences of silver nitrate concentration, reaction time, and stabilizer on the formation of Ag NPs were investigated by UV-vis spectrophotometry. The prepared smooth and dense cellulose / Ag NP fibers showed high mechanical properties, with a tensile strength of 304.3 MPa and an elongation at break of 22.1%. The fibers exhibited excellent antibacterial activities against Escherichia coli and Staphylococcus aureus, with more than 99% of E. coli bacteria killed by Ag NP / cellulose fibers. The synthesis procedure offers a general and mild approach to designing materials of almost any shape.

Surface Engineering of Regenerated Cellulose Nanocomposite Films with High Strength, Ultraviolet Resistance, and a Hydrophobic Surface

“…Due to its high fraction of intra- and intermolecular hydrogen bonding, cellulose is hard to treat in solution or as a melt. The solvent quaternary ammonium ionic liquids (ILs) that were developed in the present authors’ laboratory can dissolve cellulose at low temperatures; a series of regenerated cellulose functional fibers have exhibited good properties in previous reports [ 18 , 19 ]. Using blend modification and adding additional fillers enhances the performance of the RC film, rendering the film more widely useful.…”