Dept. of Physics, Tezpur University, Napaam, Tezpur 784028, Assam, India.
Mater Sci Eng C Mater Biol Appl. 2013 Dec 1;33(8):4900-4. doi: 10.1016/j.msec.2013.08.009. Epub 2013 Aug 16.
In this work, the effect of 100 MeV Si(9+) ion beam with four different fluences on antioxidant and structural properties of polypyrrole nanotubes has been investigated. Polypyrrole nanotubes have been synthesized by reactive self degrade template method. Fragmentation of the polypyrrole nanotubes at higher fluence is revealed from the high resolution transmission electron micrograph (HRTEM) and X-ray diffraction (XRD) results. The decrease in characteristics band of polypyrrole in Fourier transmission of infrared spectra (FTIR) spectra suggests the main chain scission of polypyrrole during irradiation. The free radical scavenging activity of pristine and irradiated samples are evaluated by using α, α-diphenyl-β-picrylhydrazyl (DPPH) assay. The decline of the UV-visible absorbance at 516 nm suggests the neutralization of DPPH free radicals through the reaction with polypyrrole. Significant increase in antioxidant activity of polypyrrole nanotubes is observed with increase in ion fluence.
在这项工作中，研究了四种不同通量的 100 MeV Si(9+)离子束对聚吡咯纳米管的抗氧化和结构性能的影响。聚吡咯纳米管通过反应自降解模板法合成。高分辨率透射电子显微镜（HRTEM）和 X 射线衍射（XRD）结果表明，在较高通量下，聚吡咯纳米管发生了碎裂。傅里叶变换红外光谱（FTIR）谱中聚吡咯特征带的减少表明，在辐照过程中聚吡咯主链发生了断裂。通过使用α，α-二苯基-β- picrylhydrazyl（DPPH）测定法评估原始和辐照样品的自由基清除活性。516nm 处的紫外-可见吸收的下降表明，通过与聚吡咯的反应，DPPH 自由基被中和。随着离子通量的增加，聚吡咯纳米管的抗氧化活性显著增加。
