Antimicrobial Membrane Cellulose Acetate Containing Ionic Liquid and Metal Nanoparticles
Stable metallic Au(0), Ag(0) and Pt(0) nanoparticle-containing membrane films (20 m thickness) were obtained by combining irregularly shaped nanoparticles of monomodal size distributions (11 ± 1.5 nm Au(0), 8.9 ± 2.1 nm Ag(0) and 2.8 ± 0.4 nm Pt(0)) in the ionic
liquid (IL) 1-n-butyl-3-methylimidazolium bis(trifluoromethane sulfonyl)imide (BMI · (NTf)2 with a syrup of cellulose acetate (CA) in acetone. The presence of small and stable Au(0), Ag(0) or Pt(0) nanoparticles induced an augmentation in the CA/IL film surface areas.
The addition of the IL to the membrane resulted in an increase of its elasticity and a decrease in its tenacity and toughness, whereas its stress at break was not influenced. High antimicrobial activity was observed in membranes containing Au(0), Ag(0) and Pt(0) metal concentrations as low
as 1 mg of metal per 5 g of CA. The CA/IL/nanoparticle combination enhanced the activity and durability of the metal nanoparticles and provided greater antimicrobial activity against E. coli and S. aureus bacteria.
Keywords: ANTIMICROBIAL ACTIVITY; CELLULOSE; IONIC LIQUIDS; NANOPARTICLES
Document Type: Research Article
Publication date: 01 June 2011
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