Please use this identifier to cite or link to this item: http://umt-ir.umt.edu.my:8080/handle/123456789/5988
Title: The Potential Use Of A Layer-By-Layer Strategy To Develop Ldpe Antimicrobial Films Coated With Silver Nanoparticles For Packaging Applications
Authors: Shafrina, Azlin-Hasim
Malco C., Cruz-Romero
Enda, Cummins
Joseph P., Kerry
Michael A., Morris
Keywords: Layer-by-layer
Coating
Silver nanoparticles
Antimicrobial packaging
Low density polyethylene
Issue Date: 9-Sep-2015
Publisher: Journal of Colloid and Interface Science
Citation: Vol.461;239-248p.
Abstract: Commercial low-density polyethylene (LDPE) films were UV/ozone treated and coated using a layer- by-layer (LbL) technique by alternating the deposition of polyethyleneimine (PEI) and poly(acrylic acid) (PAA) polymer solutions and antimicrobial silver (Ag). The effects of the initial pH of the PEI/PAA polymer solutions alternating layers (pH 10.5/4 or 9/6.5) on the antimicrobial activity of the developed LbL coat- ings combined with Ag against Gram-negative and Gram-positive bacteria were investigated. The results from fourier transform infrared spectroscopy and toluidine blue O assay showed that LDPE LbL coated using PEI/PAA polymer solutions with initial pH of 10.5/4 significantly increased the presence of carboxylic acid groups and after Ag attachment the coating had higher antimicrobial activity against both Gram-negative and Gram-positive bacteria compared to the LDPE LbL coated using PEI/PAA polymer solutions with initial pH of 9/6.5. The LDPE LbL coated films using non-modified pH PEI/PAA polymer solutions decreased the water contact-angle indicating an increased hydrophilicity of the film, also increased the tensile strength and roughness of LDPE LbL coated films compared to uncoated LbL sam- ples. The LDPE LbL coated films attached with Ag + were UV/ozone treated for 20 min to oxidise Ag + to Ag 0 . The presence of Ag 0 (Ag nanoparticles (NPs)) on the LDPE LbL coated films was confirmed by XRD, UV–vis spectrophotometer and colour changes. The overall results demonstrated that the LbL technique has the potential to be used as a coating method containing antimicrobial Ag NPs and that the manufac- tured films could potentially be applied as antimicrobial packaging.
URI: http://hdl.handle.net/123456789/5988
Appears in Collections:Journal Articles



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