Preparation of nanofiber particles from the leaf of Aristida hystrix and its characterization

ABSTRACT

Natural fibers have been focused by researches to develop high performance and eco-friendly reinforcement in polymer composites. The present work is deliberated on the characterization of nanoparticles of Aristida hystrix (AH) leaf fiber to confirm their compatibility as reinforcement in polymer composites. The macro leaf fiber is reduced to nanofiber particles by ball milling method. From the characterization results, the AH leaf nanoparticles had cellulose content of (61.21 wt %) and crystallinity index (58.37%). The thermal stability of AH nanofiber particles was studied under nitrogen and oxygen environment. From the results obtained, the thermal stability of this fiber was found to be closer to 298.6°C and 312.6°C respectively. The morphological analysis evidenced that the cellulosic particles were in nanoscale. The antibacterial activity of AH nanofiber particles against Escherichia coli, Acetino bacteria, Klebsiella pneumonia, and Staphylococcus aureus was determined by well diffusion method. The extracted AH nanopowder prepared by distilled water showed the maximum zone of inhibition against all tested bacterias in low concentrations (50 mg/50 µL). The zone of inhibition of AH fiber particles was better in Staphylococcus aureus bacteria, which is suitable for the medical applications.

摘要

天然纤维一直是研究开发高分子复合材料高性能环保型增强材料的热点。目前的工作是商议AristidaHystrix纳米颗粒的表征（啊）叶纤维确认其兼容性的聚合物复合材料加固。球磨法将大叶纤维还原为纳米纤维颗粒。从表征结果，啊叶纳米颗粒具有纤维素含量（61.21wt%）和结晶指数（58.37%）。啊纳米纤维粒子的热稳定性进行了氮气和氧气的环境中，从结果来看，这种纤维的热稳定性越具有分别298.60c和312.60c。形态学分析证明纤维素颗粒是纳米尺度的。用扩散法测定了纳米级纳米纤维对大肠杆菌、丙酮细菌、肺炎克雷伯菌和金黄色葡萄球菌的抗菌活性。提取啊纳米粉用蒸馏水表明对所有测试的细菌在低浓度抑制最大区（50mg／50µL）。在金黄色葡萄球菌中，AH纤维颗粒的氧化稳定性较好，适于医学应用。

KEYWORDS:

• Aristida hystrix fiber
• crystallinity
• nanoparticle
• X-ray diffraction
• Fourier transform
• ball milling

关键词:

• 纤维；结晶；纳米颗粒；射线衍射；傅里叶变换；球磨