Paper Information

Journal:   JOURNAL OF FOOD RESEARCH (UNIVERSITY OF TABRIZ)   2015 , Volume 25 , Number 4; Page(s) 551 To 561.
 
Paper: 

CARBOXYMETHYLCELLOLUSE- OLEIC ACID BASED EMULSIFIED NANOCOMPOSITES CONTAINING TIO2NANO-PARTICLE: STUDY OF MICROSTRUCTURE AND PHYSICAL PROPERTIES

 
 
Author(s):  ARAB KH., GHANBARZADEH B.*, GHIASIFAR SH., KARIMI SH.
 
* DEPARTMENT OF FOOD SCIENCE AND TECHNOLOGY, FACULTY OF AGRICULTURE, UNIVERSITY OF TABRIZ, TABRIZ, IRAN
 
Abstract: 

In this study, emulsified nanocomposite films based on carboxymethyl cellulose (CMC) - titanium dioxide (TiO2) (rutile phase) were made by casting method. In order to investigate the resulting films characteristics, different tests including X-ray diffraction (XRD) analysis, water vapor permeability (WVP), Atomic force microscopy (AFM), UV-VIS transmittance spectra and differential scanning calorimetry (DSC)were performed. TiO2 nanoparticles, as a filler, were added to the CMC –oleic acid emulsion at different concentrations (0.5, 1, 2% w/w) after homogenization by an ultrasonic device. Study of nanocomposite structure by XRD test showed that nanofiller have been homogeneously dispersed in the biopolymer matrix. The WVPsof the films were reduced significantly from 7.15×10 -8 g/m.h.Pa in the control sampleto 6.09×10 -8 g/m.h.Pa in the films containing2% nanoparticle. Topography images obtained from AFM showed that addition of TiO2nanoparticles increased the roughness of CMC based films. The ultraviolet and visible radiation transmittance values in the nanocomposite containing 2% TiO2 nanoparticles were 15.13% and 30.58%, respectively, i.e., 85% of UV radiation and 70% of VIS radiation were absorbed or scattered. DSC test showed that, the glass transition temperature increased from 86.65oC in the control film to 81.4oC in the film containing 2% nanoparticle.

 
Keyword(s): TITANIUM DIOXIDE, CARBOXYMETHYL CELLULOSE FILMS, EMULSIFIED NANOCOMPOSITE, THERMAL PROPERTIES, PERMEABILITY
 
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