title: Effect of chitin nanofiber on the morphological and physical properties of chitosan/silver nanoparticle bionanocomposite films.
abstract: The effects of silver nanoparticles (AgNPs) at 1% wt. and different concentrations of chitin nanofiber (CHNF) (1.5-6% wt.) on tensile properties, water vapor permeability (WVP), solubility, swelling, color properties and morphological characteristics of chitosan nanocomposite films were studied. FTIR results confirmed that the affinity of CHNF for interaction with chitosan chains is more than AgNPs. SEM images showed that CHNF was uniformly distributed in the polymer matrix. X-ray diffraction confirmed that the degree of crystallinity was increased by addition of 6% CHNF. Response surface methodology (RSM) was used to determine the optimum amount of CHNF as nano filler. The optimization was based on maximizing tensile strength, Young's modulus, elongation at break, L* and decreasing WVP, solubility and swelling. The results showed that the AgNPs had a negative effect on mechanical and color properties of chitosan films. But incorporation of CHNF improved their mechanical and barrier properties significantly. Lowest WVP, solubility and swelling of nanocomposite films were respectively for 6, 2 and 2% wt. of CHNF content. Considering all physical and mechanical parameters, the optimal value calculated for CHNF, was 4.55%.
authors.affiliation: Department of Food Science and Technology, Faculty of Agriculture, Urmia University, P.O. Box 165, Urmia,57159-44931, Iran.
authors.forename: Haleh
authors.initials: H
authors.lastname: Jafari
authors.affiliation: Department of Food Science and Technology, Faculty of Agriculture, Urmia University, P.O. Box 165, Urmia,57159-44931, Iran. Electronic address: k.pirouzifard@yahoo.com.
authors.forename: MirKhalil
authors.initials: M
authors.lastname: Pirouzifard
authors.affiliation: Department of Food Science and Technology, Faculty of Agriculture, Urmia University, P.O. Box 165, Urmia,57159-44931, Iran.
authors.forename: Mohammad Alizadeh
authors.initials: MA
authors.lastname: Khaledabad
authors.affiliation: Department of Food Science and Technology, Faculty of Agriculture, Urmia University, P.O. Box 165, Urmia,57159-44931, Iran.
authors.forename: Hadi
authors.initials: H
authors.lastname: Almasi
mesh_terms: D002686:Chitin / Q000737:chemistry*; D048271:Chitosan / Q000737:chemistry*; D003116:Color; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D053761:Nanocomposites / Q000737:chemistry* / Q000648:ultrastructure; D057139:Nanofibers / Q000737:chemistry* / Q000648:ultrastructure; D010539:Permeability; D012044:Regression Analysis; D012834:Silver / Q000737:chemistry*; D012995:Solubility; D017550:Spectroscopy, Fourier Transform Infrared; D013227:Steam; D013718:Tensile Strength; D014961:X-Ray Diffraction
chemical_list: D013227:Steam; D002686:Chitin; D012834:Silver; D048271:Chitosan
keywords: Chitin nanofiber; Chitosan film; Optimization; Physical properties