Biosynthesized Silver Nanoparticles for Antibacterial Treatment of Cellulosic Fabrics Using O2-Plasma
A silver-tolerant (3.5 mM silver nitrate) marine bacterial isolate (Bacillus sp.) was used for biosynthesis of Ag-nanoparticles. UV-Vis spectra showed an absorption peak between 410 and 440 nm. Transmittance electron microscopic (TEM) analysis indicated the presence of 2 to 7 nm Ag-nanoparticles. O2-plasma pretreatment, followed by subsequent treatment with biosynthesized Ag-nanoparticles, improved loading and fixation onto the activated surfaces of the cellulosic fabrics (linen, cotton, and lyocell), and improved antibacterial activities against Gram-positive (Staphylococcus aureus) and Gram-negative (Escherichia coli) bacteria. Presence of Ag-nanoparticles on linen and lyocell surfaces was confirmed using scanning electron microscope (SEM) images. Antibacterial activity showed no severe reduction even after 15 washing cycles. Surface modification extent, Ag-nanoparticle loading, as well as antibacterial activity, was determined by the nature of cellulosic substrate.
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Document Type: Research Article
Publication date: January 1, 2014
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