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首页> 外文期刊>Journal of Polymers and the Environment >Experimental Investigation of Cellulose/Silver Nanocomposites Using In Situ Generation Method
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Experimental Investigation of Cellulose/Silver Nanocomposites Using In Situ Generation Method

机译：纤维素/银纳米复合材料的原位生成实验研究

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Cellulose gel films were prepared by regeneration process using pre-cooled aq.(8 wt% LiOH + 15 wt% urea) mixture as solvent and ethyl alcohol as non solvent. The Terminus cattapa leaf extract diffused wet cellulose films were then dipped in 1-5 mM aq.AgNO3 solutions to allow in situ generation of silver nanoparticles (AgNPs). Besides the in situ generation, some AgNPs were also formed outside the wet films in the solution. The AgNPs formed outside the films were observed under transmission electron microscope and scanning electron microscope. The nanocomposite films were also characterized by Fourier transform infrared spectroscopy, X-ray diffraction and thermogravimetric analysis and tensile test. The thermal stability of the composite films was lower than that of the matrix up to a temperature of similar to 300 degrees C and afterwards showed a reverse trend. The tensile strength of the nanocomposite films was found to be higher than the matrix but decreased with increasing concentration of aq.AgNO3. The cellulose/AgNPs composite films showed good antibacterial activity against E. coli (gram positive) and Bacillus sp. (gram negative). Based on the aforementioned properties, the cellulose/AgNPs composite films can be considered for antibacterial packaging and medical applications.
机译：纤维素凝胶膜是通过再生工艺制备的，使用的是预冷的（8 wt％LiOH + 15 wt％尿素）水溶液作为溶剂，乙醇作为非溶剂。然后将总站叶子提取物扩散的湿纤维素膜浸入1-5 mM AgNO3水溶液中，以原位生成银纳米颗粒（AgNPs）。除了原位生成之外，溶液中的湿膜之外还形成了一些AgNP。在透射电子显微镜和扫描电子显微镜下观察膜外形成的AgNP。还通过傅里叶变换红外光谱，X射线衍射，热重分析和拉伸试验对纳米复合膜进行了表征。在接近300℃的温度下，复合膜的热稳定性低于基质的热稳定性，随后显示出相反的趋势。发现纳米复合膜的拉伸强度高于基体，但是随着AgNO 3水溶液浓度的增加而降低。纤维素/ AgNPs复合膜对大肠杆菌（革兰氏阳性）和芽孢杆菌具有良好的抗菌活性。 （克负数）。基于上述特性，可以考虑将纤维素/ AgNPs复合膜用于抗菌包装和医疗应用。

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