Ghazanfari Marzieh, Ranginkar Jahromi Iman, Moallemi-Oreh Abbas, Ebadi-Dehaghani Hassan, Akbarzadeh Mohammad
Shahreza Branch, Islamic Azad University, Shahreza, Iran.
Shahreza Branch, Islamic Azad University, Shahreza, Iran.
Int J Biol Macromol. 2016 Dec;93(Pt A):703-711. doi: 10.1016/j.ijbiomac.2016.09.010. Epub 2016 Sep 5.
Casting films of chitosan (CS)/cellulose nanofibers (CNF) biocomposites containing 0.5-5wt.% of CNF were prepared. Mechanical and physical properties along with scanning electron microscope (SEM) study revealed the best properties for the nanocomposite containing 3wt.% of CNF. Exceeding than this CNF content led to aggregation phenomenon. Then this optimized content nanocomposite was selected in order to investigate the effect of mixing condition on the properties. In the first method the CS and CNF were added simultaneously under ultrasound irradiation. In another method dispersion of CNF was carried out in the solvent separately and then added to the CS solution using ultrasound system. SEM images of the nanocomposites indicated occurrence of aggregation in the simultaneous addition of CS and CNF method. A statistical analysis showed that the best method for effective distribution and dispersion of the nanoparticles within the CS was dispersion of CNF separately in the solvent and addition to the CS solution along with ultrasonic wave's irradiation. The ultrasound induced mixing had a significant effect on the dispersion of the nanoparticles, resulting in significant differences in almost the properties of the nanocomposites.
制备了含有0.5-5wt.%纤维素纳米纤维（CNF）的壳聚糖（CS）/纤维素纳米纤维生物复合材料薄膜。通过力学和物理性能以及扫描电子显微镜（SEM）研究发现，含3wt.% CNF的纳米复合材料具有最佳性能。超过此CNF含量会导致聚集现象。然后选择这种优化含量的纳米复合材料来研究混合条件对性能的影响。在第一种方法中，CS和CNF在超声辐射下同时添加。在另一种方法中，先将CNF在溶剂中单独分散，然后使用超声系统将其添加到CS溶液中。纳米复合材料的SEM图像表明，在同时添加CS和CNF的方法中出现了聚集现象。统计分析表明，使纳米颗粒在CS中有效分布和分散的最佳方法是先将CNF在溶剂中单独分散，然后在超声波辐射下添加到CS溶液中。超声诱导混合对纳米颗粒的分散有显著影响，导致纳米复合材料的几乎所有性能都有显著差异。
