title: Preparation of silver nano-particles immobilized onto chitin nano-crystals and their application to cellulose paper for imparting antimicrobial activity.
abstract: Immobilized silver nano-particles (Ag NPs) possess excellent antimicrobial properties due to their unique surface characteristics. In this paper, immobilized silver nano-particles were synthesized in the presence of chitin nano-crystals (CNC) based on the Tollens mechanism (reduction of silver ion by aldehydes in the chitosan oligosaccharides (COS)) under microwave-assisted conditions. The prepared Ag NPs-loaded CNC nano-composites were then applied onto the paper surface via coating for the preparation of antibacterial paper. Fourier transform infrared (FT-IR) and X-ray diffraction (XRD) results confirmed that the Ag NPs were immobilized onto the CNC. The transmission electron microscope (TEM) and scanning electron microscopy (SEM) results further revealed that the spherical Ag NPs (5-12nm) were well dispersed on the surface of CNC. The coated paper made from the Ag NPs-loaded CNC nano-composites exhibited a high effectiveness of the antibacterial activity against E. coli or S. aureus.
authors.affiliation: Key Laboratory of Advanced Materials and Technology for Packaging, Hunan University of Technology, Zhuzhou 412007, China; State Key Laboratory of Pulp & Paper Engineering, South China University of Technology, Guangzhou 510640, China; Limerick Pulp and Paper Centre, Department of Chemical Engineering, University of New Brunswick, Fredericton, NB, Canada E3B 5A, Canada.
authors.forename: Zhihan
authors.initials: Z
authors.lastname: Li
authors.affiliation: State Key Laboratory of Pulp & Paper Engineering, South China University of Technology, Guangzhou 510640, China.
authors.forename: Ming
authors.initials: M
authors.lastname: Zhang
authors.affiliation: Tianjin Key Laboratory of Pulp and Paper, Tianjin University of Science and Technology, Tianjin 300457, China; Limerick Pulp and Paper Centre, Department of Chemical Engineering, University of New Brunswick, Fredericton, NB, Canada E3B 5A, Canada.
authors.forename: Dong
authors.initials: D
authors.lastname: Cheng
authors.affiliation: State Key Laboratory of Pulp & Paper Engineering, South China University of Technology, Guangzhou 510640, China. Electronic address: rdyang@scut.edu.cn.
authors.forename: Rendang
authors.initials: R
authors.lastname: Yang
mesh_terms: D000900:Anti-Bacterial Agents / Q000737:chemistry* / Q000494:pharmacology*; D002482:Cellulose / Q000737:chemistry*; D002686:Chitin / Q000737:chemistry*; D004926:Escherichia coli / Q000187:drug effects; D053768:Metal Nanoparticles / Q000737:chemistry*; D008872:Microwaves; D036103:Nanotechnology; D010209:Paper; D012834:Silver / Q000737:chemistry*; D013211:Staphylococcus aureus / Q000187:drug effects; D013499:Surface Properties; D014867:Water / Q000737:chemistry
chemical_list: D000900:Anti-Bacterial Agents; D014867:Water; D002686:Chitin; D012834:Silver; D002482:Cellulose
keywords: antibacterial activity; chitin nano-crystals; chitosan oligosaccharides; silver nanoparticles